■9°5] COCKRRF.LL—SEPARATJOX OF A’FFS 89 
Last ventral segment not so fringed, and with a large apical projection 
( Kansas) dcplanata Cr. 
14. Last ventral segment with a strong fringe of black hair; first abdominal 
segment red; middle of scutellum with an impunctate line (Mexico) 
r/uiiu 7 >ifca Cr. 
Last ventral segment not so fringed 15 
15. Last ventral segment very narrow, not notched at sides (Mexico) 
"* zapotcca Cr. 
Last ventral segment notched at sides, legs red (dark \\\ octodcntata ) 16 
16. Scutellum with a rather large median projection 17 
Scutellum without any projection 18 
17. Lateral teeth of scutellum slender ( Illinois) .... gernmna Ox. 
Lateral teeth of scutellum broad (Mexico) lotonaca Cr. 
18. Last dorsal segment narrowed and strongly keeled apically, looking like 
a chicken’s beak; size larger than octodentala or (?/////>( Texas ) in si/a Cr. 
Last dorsal not so 19 
19. Larger; last dorsal long ( Mexico) nu’.xiauta Cr. 
Smaller; last dorsal shorter 20 
20. .\bdominal hair-bands white oc/oden/ata Say, Cresson 
.\bdominal hair-bands stained with yellowish a/ii/is Cr. 
( Robertson calls octodeniaia “Say” of Cresson, C. sa\'i rob., and 
regards aliilis as the real octodentata. However, he admits that j-in/was 
included in octodentata by Say. ) 
21. Last ventral ending in a very long spine, and with a very long fringe of 
black hair ( Cuba ) nhlerii Cr. 
Last ventral not so ending 22 
22. Last ventral broad, fringed with hair, and not notched at the sides 23 
Last ventral notched at sides - .... 24 
23. Smaller; last ventral with a very small apical point or spine ( Pa. ) 
modesta Smith. 
Larger; last ventral without such a point (Colorado) . aiternata Say. 
24. Last ventral very broad, abruptly narrowed, the apical process forming 
about an equilateral triangle; scutellum with a median tubercle 
(Colorado) . aperta Cr, 
Last ventral not so; sculellum without a median tubercle, last dorsal 
not curved upwards at end 25 
25. Last dorsal, seen from above, abruptly narrowed 26 
Last dorsal, seen from above, not abruptly narrowed 27 
