THE PEA APHIS WITH RELATION" TO FOEAGE CROPS. 



25 



Table I. — Measurements of European specimens of Macrosiphum pisi Kalt — Contd. 



WINGED VIVIPAROUS FEMALE. 





Antennae. 



Length. ' 



Wings. 



Labeled — 



M 



t— 1 









> 



1 



a 



03 



-211 



B B bun 



'3 



O 



a 



c3 



O 





rt 



S 



Macrosiphum pisi Kalt. 

 On sweet peas 20-9-'12. 

 England. F. V. Theo- 

 bald 



Mm. 



0.191 

 ' .191 



.20S 

 ' . 20S 



.208 

 ' .208 



.174 



Mm. 



0.113 

 .113 



.113 

 .113 



.104 

 .096 



.104 



Mm.. 



1.069 

 1.060 



1.148 

 1.113 



1.061 

 1.078 



11.061 



Mm. 



0.930 

 .913 



.991 



Mm. 



0. 843 

 .852 



.817 



Mm. 



0.313 

 .330 



.321 



Mm. 



1.182 

 1.182 



29 

 25 



21 

 21 



22 

 26 



26 



Mm. 



0.748 

 .765 



.956 



Mm. 

 j-0.539 



1 .608 



Jfm. 



4.41 



Mm. 

 1.62 



Macrosiphum ulmaris 

 (=pisiKalt). OnPisum 





Tullgren 



.913 

 .965 



1.095 



.817 

 .817 



.904 



.313 

 .330 



.330 



1.304 

 1.278 



2 1.061 





4.45 





Macrosiphum pisi Kalt. On 

 Pisum sativum, 1/14 VIII 

 '09. Gouvern, Pskow, 

 Russia. A. Mordwilko. 

 Rec'd from N. Cholod- 



1.008 

 .991 



.7S2 

 .800 



| .608 

 [■ .556 



1.55 



Macrosiphum pisi Kalt. On 

 Lathyrus sp., Oct., 1903. 

 Warschau, Russia. A. 

 Mordwilko. Rec'd from 

 N. Cholodkovsky 

























WINGLESS OVIPAROUS FEMALE. 



Macrosiphum pisi Kalt. On 

 Lathyrus sp., Oct., 1903. 

 Warschau, Russia. A. 

 Mordwilko. Rec'd from 

 N. Cholodkovsky 



Do 



0.191 



: .191 



.191 

 .191 



0.104 

 .104 



.113 



.10! 



0. 9S2 

 .956 



1.113 

 1.130 



0.721 

 .730 



.782 

 .765 



0. 765 

 .756 



.748 

 .748 



0.295 

 .269 



.313 

 .295 



1.043 

 1. 043 



1.061 

 1.061 



0.713 



.800 



1 Upturned, and measurements only approximate. 



In no case, in specimens included in this table, were sensoria present 

 on antennal segments IV and V, excepting the usual distal one on V; 

 the cornicles were imbricated throughout, there being no reticulation 

 at the tips. The hind tibiae of the oviparous females bore numerous 

 sensoria as is the case with specimens occurring in America. Figure 

 10, a-d were made from specimens collected by Dr. A. Mordwilko in 

 Russia and sent us by Dr. N. Cholodkovsky. 



We have not had an opportunity to examine specimens of the 

 wingless or winged males from Europe but our specimens of the 

 wingless male agree in every particular with the description given 

 by Mordwilko (10). 



98034°— Bull. 276—15 i 



