THE CANADIAN ENTOMOLOGIST. 231 



forms; very sparsely hairy; segment I concolorous with head, II pale 

 with a slight duskiness, III, IV, V and base VI pale with blackish 

 tips, VI filament black; sensoria as in the wingless viviparous 

 female (PI. XVIII, fig. 57). Beak reaching to coxa? of second 

 pair of legs. Fore pair of legs entirely pale, excepting distal end 

 of tarsus; middle pair with femur dusky to blackish except at base; 

 hind pair as the middle pair, but the tibia dusky except at tip; 

 hind tibiae noticeably swollen and bearing many irregularly placed 

 circular sensoria (PI. XVIII, fig. 58). Cornicles white as in 

 other forms. Cauda pale with greenish tint, anal plate rounded 

 as in the male. 



Measurements from six individuals, as follows: Length of body 

 1.63 to 2.01, average 1.81 mm.; width 0.96 to 1.12, average 

 1.04 mm.; antenna I, 0.089; II, 0.0130; III, 0.269 to 0.313, aver- 

 age 0.293; IV, 0.148 to 0.203, average 0.179; V, 0.174 to 0.209, 

 average 0.186; VI, base, 0.113 to 0.139, average 0.130; VI, fila- 

 ment 0.070 to 0.090, average 0.078; total average length 0.992 mm. 



The egg is very pale greenish when first laid, later changing 

 to black. 



Aphis pseudobrassicae, n. sp. 



This species was first received by us from Mr. W. J. Schoene- 

 who found occasional specimens on cabbage at Geneva, New York. 

 July 15, 1912. Later in the year (Nov. 20, 1912), a correspondent 

 sent us specimens collected at Evansville, Indiana, with the note 

 that they were abundant on kale and mustard, and that "these 

 same insects have been bothering our turnips and turnip greens, 

 destroying large portions of the patches. It does not bother on 

 spring greens, only on fall crops." In the lot received from Evans- 

 ville were Myzus persicce and Aphis pseudobrassiccc in about equal 

 numbers. 



The past fall (September and October, 1913) we have found 

 it at Lafayette, Indiana, abundant on radish and turnip and in 

 the inssctary it bred rather freely on rap?, although the two former 

 seem to be the preferred host plants. Mr. F. B. Paddock has also 

 found it abundant on turnip at College Station, Texas, and has 

 kindly forwarded specimens to us. No doubt further collections 



