216 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Genitalia without such structures (fe- 

 males) 



Apex ot ninth sternite produced into a 

 spoon-shaped lobe situated beneath 

 aedeagus, fig. 749 pavida, p. 21 



Apex of ninth sternite with a pair of 

 long, or short, narrow processes. . . 



Claspers with basal portion not pro- 

 duced into a wide flap, figs. 750, 751 



7 



No dorsal pattern formed by marks on 

 wings, which have either indistinct 

 apical rows of spots or the spots 

 absent and the veins quite promi- 

 nent, fig. 758 albida, p. 220 



7. Wings with transverse yellowish bars 



in the membrane, and with four 

 black areas in membrane near apex 



of posterior margin, fig. 755 



exquisita, p. 21 7 



Wings without transverse yellowish 

 bars, sometimes with four black 

 areas of hairs but never black areas 

 in the membrane 8 



8. Wings with four patches of black hair 



near apex of posterior margin, fig. 

 757 Candida, p. 217 



Fig. 754. — Leptocella spiloma, wing pattern. 



Fig. 757. — Leptocella Candida, wing pattern. 



Fig. 1^^. —Leptocella exquisita, wing pattern. pig. 75%.— Leptocella albida, wing pattern. 



Wings without patches of black hair 

 in this region 9 



9. Wings yellowish with small, well de- 

 lineated, scattered black spots, fig. 

 756 pavida, p. 218 



Fig. 756. — Leptocella pavida, wing pattern. 



Claspers with basal portion produced 

 into a wide flap, fig. 752 5 



4. Wings with transverse yellowish bars 



in the membrane, fig. 755 



exquisita, p. 217 



Wings without transverse yellowish 

 bars in the membrane, fig. 757. . . . 

 Candida, p. 217 



5. Ventral aspect of head with eye width 



equal to distance between eyes, 



fig. 761 spiloma, p. 219 



Ventral aspect of head with eye width 



less than distance between eyes, figs. 



759,760 6 



6. Wings in repose forming a distinct 



dorsal pattern of V-marks, as in 

 fig. 754 diarina, p. 218 



761 



Heads, Ventral Aspect 



Fig. 759. — Leptocella albida. 

 Fig. 760. — Leptocella diarina. 

 Fig. 761. — Leptocella spiloma. 



