3©6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



IV of alate female typically without sensoria (sometimes one to 

 three present) crataegi 



26. Wing veins all heavy .purpurascens 



Wing veins not heavy kaltenbachii 



27. Filament of vi nearly as long as or longer than A of fore wing . . 28 

 Filament of vi approximately one-half length of A of fore wing 



n n ' . . . illinoiensis 



28. Base of vi approximately three times as long as ii pisi 



Base of vi not more than two and one-half times ii pelargonii 



29. Apex of cornicle with definite reticulated area (distinctly more 



than three rows of reticulations) (e. g., solanifolii) .... 30 



Apex of cornicle with about three rows of subreticulated striations 



hieracii 

 kaltenbachii 



30. Reticulated area of cornicle hardly exceeding, if reaching, one-half 



its length -j! 



Reticulated area of cornicle extending two-thirds its length; cor- 

 nicle hardly longer than cauda (sometimes shorter) sanborni 



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. No unusual caudal projection 34 



Caudal projection subequal to cauda in length giving "two tailed" 



appearance . cnici 



34. Antennal iii nearly as long as iv-j-v and with about seventy 



tuberculate sensoria gravicornis 



Antennal iii not unusual in foregoing particulars 35 



35. Cornicle nearly as long as or longer than iii : 36 



Cornicle considerably shorter than iii ....................... 37 



36. Ill with approximately forty-five sensoria eupatoricolens 



III with approximately thirty sensoria erigeronensis 



37. Cornicle at least five-sixths as long as A 38 



Cornicle approximately three-fourths as long as A or shorter .... 39 



38. Reticulated area of cornicle one-third its length or more luteola 



Reticulated area of cornicle less than one-fourth its length rudbeckiae , 



39. Cornicle distinctly longer than one-half of iii 40 



Cornicle not more than one-half as long as iii tanaceti 



40. Hind tibia approximately two times length of A of fore wing taraxaci 

 Hind tibia approximately two and one-half times length of A of 



fore wing ambrosiae 



M. albifrons Essig. (Fig. 29, 4.) 



Pom. Jour. Ent, iii, 543, 191 1. 



For description and figures see Essig (1911b). About twenty 

 sensoria are present on antennal segment iii of apterous vivipara. 



On Lupinus, New Haven, 30 July, 1903. 

 M. amelanchiericolens Patch. 



Me. Agr. Expt. Sta., Bull. 282, 211, 1919. 

 M. artemisicola (Williams). 



Aphid, Nebr., 73, 191 1. 



This species is considered a synonym of Myzus glandulosus 

 (Kaltenbach) by van der Goot (1915). For description and 

 figures see Wilson (1915b). 



