292 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



23 Cornicle shorter than iii 33 



Cornicle longer than antennal segment iii salicicola 



24. Antennal segment iii shorter than iv + v 25 



III at least subequal to iv + v maidiradicis 



25. Cornicle nearly or quite as long as filament of antennal segment vi 26 

 Cornicle plainly shorter than filament of vi 29 



26. Filament more than twice as long as base 27 



Base of antennal segment vi as long as or longer than one-half 



the filament medicaginis 



27. Filament subequal to v + base of vi 28 



Filament of antennal segment vi about three-fourths the length of 



V -f- base of vi laburni 



28. Antennal iii with about four or five sensoria rubiphila 



III with about eight to ten sensoria pomi 



29. Cornicle subequal to or longer than antennal segment iv 30 



Cornicle shorter than iv 34 



30. Cornicle distinctly shorter than iii 31 



Cornicle and antennal segment iii subequal spiraecola 



(sometimes gossypii) 



31. Antennal segment iv typically with sensoria 32 



IV tj'pically without sensoria gossypii 



32. Sensoria of antennal segment iv typically confined to distal two- 



thirds of segment and often grouped rather than in a row . .sanborni 

 Sensoria of iv in row and not typically confined to distal two-thirds 

 of segment abbreviata 



33. Cornicle at least three times as long as second joint of hind tarsus 



exclusive of claw coreopsidis 



Cornicle about twice the length of second tarsal joint furcata 



Cornicle distinctly less than twice the length of second tarsal joint 



(see also 21) maidiradicis 



34. Filament of antennal segment vi about three times as long as base 



cerasifoliae 

 Filament about two times length of base sedi 



35. Cornicle plainly shorter than twice the length of second joint of 



tarsus (exclusive of claws) 36 



Cornicle at least approximately as long as twice the length of tarsus 38 



36. Wing veins ordinary 37 



Wing veins noticeably heavy and a little blurred pseudobrassicae 



37. Antenna with filament of vi hardly more than twice the length of 



base of vi maidis 



Filament of vi more than twice the length of base pseudoavenae 



38. Cornicle distinctly longer than segment iv of antenna 39 



Cornicle subequal to iv (or at most not distinctly longer) 41 



39. Filament more than twice as long as base 40 



Base of antennal segment vi as long as one-half the filament 



nifomaculata 



40. Abdomen green. Species occurring on Helianthus and Corniis . . 



helianthi 

 Abdomen black or dark red with rows of white pulverulent spots 

 on dorsimi. On Populus davisi 



41. Antennal segments iv + v distinctly longer than iii 42 



IV 4- V subequal to iii or not distinctly longer 



42. V without secondary sensoria 43 



Antennal segment v with secondary sensoria varians 



43. Base of vi about one-half as long as filament and as much as two- 



thirds as long as V 44 



Base of antennal segment vi about one-third as long as filament ^ 

 and about half as long as v rumicis 



