218 Maine Agricultural Experiment Station. 1919. 



27. Filament of VI approximately ^ length of A 



of fore wing illinoiensis 



Filament of VI nearly as long as or longer 

 than A of fore wing 28 



28. Base of VI approximately 3 times as long as IL.pisi 

 Base of VI not more than 2j/2 times II pelargonii 



29. Apex of cornicle with definite reticulated area 



(distinctly more than 3 rows of reticulations) 



(e. g. solanifoUi) 30 



Apex of cornicle with about 3 rows of sub- 

 reticulated striations hieracii 



kaltenbachii 



30. Reticulated area of cornicle extending two- 



thirds its length; cornicle hardly longer than 



Cauda (sometimes shorter) sanborni 



J^eticulated area of cornicle hardly exceeding, 

 if reaching, one-half its length 31 



31. Antennal III with sensoria in single row 32 



Antennal III with sensoria too numerous for 



single row 33 



32. Cornicle deep black pseudorosae 



Cornicle pale to dusky solanifolii 



33. Caudal projection sub-equal to cauda in length 



giving "two tailed" appearance cnici (Schrank) 



No unusual caudal projection 34 



34. Antennal III nearly as long as IV+V and with 



about 70 tuberculate sensoria gravicornis 



Antennal III not unusual in foregoing particu- 

 lars 35 



35. Cornicle considerably shorter than III 37 



Cornicle nearly as long as or longer than III.... 36 



36. Ill with approximately 45 sensoria eupatoricolens 



III with approximately 30 sensoria erigeronensis 



37. Cornicle at least % as long as A 38 



Cornicle approximately % as long as A or 



shorter 39 



38. Reticulated area of cornicle ^ its length or 



more luteola . 



Reticulated area of cornicle less than ^ its 

 length rudbeckiae 



39. Cornicle not more than ^ as long as III tanaceti 



Cornicle distinctly longer than J^ of III 40 



40. Hind tibia approximately 2 times length of A 



of fore wing taraxaci 



Hind tibia approximately 2^ times length of A 



of fore wing ambrosiae 



