1. Dorsum of terminal segments with a complex of structures including a forked sclerous epiproct and a dorsal sclerous projection on at least the 8th tergite . . . . . . . . . . . . . . . . . . . . . . .Males
Dorsum of abdomen without any processes; 8th sternite modified into a simple subgenital plate of various shapes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Females
Males
2. Apical segment of upper limb of epiproct long and flat to tip, very thin and regular in profile (in lateral view), and with short dorsal retrorse spines. . . . . . . . . . . Allocapnia recta
Apical segment of upper limb of epiproct either short, narrow, or tip expanded . . . . . . . . . . . 3
3. Dorsal process of 8th tergite forming a wide projecton, that is not cleft on meson . A. vivipara
Dorsal process of 8th tergite cleft on meson, the resultant lobes either close together or far apart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Dorsal process of 8th tergite forming a pair of oblique rugose areas, their dorsal aspect U- or V- shaped. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Dorals process forming a transverse bar or oval having 2 or 3 projecting apical points or lobes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
5. Profile of dorsal process of 8th tergite fairly long and either declivitous or concave, its anterior corner angulate; dorsal aspect of dorsal process somewhat U-shaped. . . . . . . . . . . . A. frisoni
Profile of dorsal process of 8th tergite either much shorter or not declivitous; dorsal aspect of dorsal process with posterior margin angulate or rounded. . . . . . . . . . . . . . . . . A. granulata
6. Seventh tergite with a sclerotized process either as large or nearly as large as sclerotized protion of process of 8th tergite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Seventh tergite with no process or wit only a small prcess that is merely a slightly elevated ridge, or process not sclerous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7. Dorsal process of 8th tergite with one mesal and two lateral points . . . . . . . . . . . . . . . . . . . . 8
Dorsal process with only two lateral points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8. Dorsal process of 8th tergite with mesal point as high as, or higher than, lateral points; lower limb of epiproct with a long, fingerlike tip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. indianae
Dorsal process with mesal point lower than lateral points; lower limb of epiproct tapering evenly to tip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A. ohioensis
Some other combination of these two characters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . presumed hybrid of A. indianae x ohioensis
9. Tergite 8 with a small anterior process in addition to a large, wide incised posterior process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. zola
Tergite 8 with only a large posterior process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10. Membranous apex of upper limb of epiproct merging imperceptibly with more sclerous basal portion, its dorsal aspect somewhat bulbous. . . . . . . . . . . . . . . . . . . . . . . . . . A. illinoensis
Membranous apex of upper limb of epiproct sharply and angularly delineated at base, its dorsal aspect short or diamond-shaped. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11. Process of 7th tergite situatied at the middle or on the front half of the tergite, viewed from the side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. pechumani
Process of 7th tergite occupying the rear half of the tergite . . . . . . . . . . . . . . . . . . .A. forbesi
12. Process of 8th tergite with a mesal point at least half the eight of a lateral lobe . . . . . . . . . . .13
Process either with only two apical lobes or with only a minuter mesal point between them . .14
13. Profile of dorsal process of 8th tergite as high as wide and without a posterodorsal projecting corner; lower limb of epiproct wider and extending laterally considerably beyond upper limb, the lateral margins often angulate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. nivicola
Profile of dorsal process wider, the posterodorsal corner markedly projecting; lower limb of epiproct, extending only slightly beyond sides of upper limb. . . . . . . . . . . . . . . . . . A. smithi
14. Apical segment of upper limb of epiproct oboid in profile and less than one-half length of base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A .rickeri
Apical segment either more slender in profile or more than one-half length of base . . . . . . . .15
15. Process of 8th tergite with lateral lobes separated by less than half the width of a lobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. mystica
Process of 8th tergite with lateral lobes much more widely separated . . . . . . . . . . A. pygmaea
Females
1. Tergite 8 having little or no mesal membranous area, the sclerous portion bridging the entire segment for half or more of its length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Tergite 8 having a fairly wide mesal membranous area extending its whole length . . . . . . . . . 3
2. Sternites 7 & 8 fused, the mesal portion of the fusion forming a solid longitudinal area in which the intersegmental suture is obliterated. . . . . . . . . . . . . . . . . . . . . . . . Allocapnia vivipara
A well-marked intersegmental suture of membranous area across the entire mesal area between the 7th & 8th sternites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. forbesi
3. Sternites 7 & 8 solidly fused on meson, the line of fusion either or not visible or indicated by a dark line or crease. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Sternites 7 & 8 either completely separated by a membranous area or joined on the meson by only a faint semisclerous strap; in some instances of the latter, the seventh sternite has an apical projection extending over the base of the 8th , and in contracted specimens the membrane cannot be seen without manipulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Line of fusion between 7th and 8th sternites not evident on meson,, the two sclerites jointing without a breatk in profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. rickeri
Line of fusion between 7th and 8th sternites indicated by a dark line and a brak in the profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Apex of 8th sternite with a wide but shallow sagittate mesal protion contrasting sharply with the much less sclerous remainder of mesal area of the sclerite. . . . . . . . . . . . . . . . A. illinoensis
Mesal area of apex of 8th sternite not contrasting noticeably with the more basal portion of the sclerite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Apex of 8th sternite angulate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. zola
Apex of 8th sternite round or truncate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Sternite 8 produced into a broad rounded flap capable of being reflexed under the edge of the sternite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Sternite 8 with apical flap either indistinct or narrow and truncate . . . . . . . . . . . . . . . . . . . . . 9
8. Apical flap of 8th sternite projecting markedly beyond mesal edge of lateral humps, which are chiefly membranous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. pygmaea
Apical flap shorter, the entire sternite sclerous . . . . . . . . . . . . . . . . . . . . . . . . . .A. ohioensis
9. Apex of 8th sternite produced inot a truncate flap capable of folding dorsally under the edge of the sternite; when extended, it reaches considerably beyond the lateral hups of the sternite. . 10
Apex of 8th sternite not so produced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. indianae
10. Apical flap of 8th sternite moderately wide, the lateral humps of the sternite chiefly membranous, the combination of the two producing a somewhat hourglass-shaped mesal dark area on the segment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. smithi
Apical flap of 8th sternite narrower and the lateral humps more extensively sclerotized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. nivicola
11. Central portion of 8th sternite forming a flat, sclerous area extending full lengthof sternite and truncate or nearly so at apex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A. pechamani
Central portion of 8th sternite with flat area either wedte-shaped, constricted at middle, only partially sclerous, or only indistinctly differentiated from latera areas except at apex of segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
12. Basomesal portion of 8th sternite forming either a nearrow or pale strap joining 7th sternite, the fusion line only faintly sclerous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. illinoensis
Sternites 7 and 8 completely separated by membrane; in contracted specimens the membrane cannot be seen with manipulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
13. Apieomesal portion of 8th sternite differentiated inot a sagittate or emarginated, fluted area set off laterally by pale membranous areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Apiomesal portion of 8th sternite not markedly differentiatied from lateral areas . . . . . . . . . .15
14. Apiomesal process of 8th sternit wider, its margin usually truncate or emarginated . . A. frisoni
Apiomesal process of 8th sternite narrower, usually pointed like a spearhead. . . . A. granulata
15. Apical margin of 8th sternite usually concave, with or without a projecting, short mesal point or arcuate lobe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. recta
16. Apical margin of 8th sternite convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. mystica
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Key to the Adult Allocapnia of Ohio