282 ENTOMOLOGICAL NEWS. [June, '09 



ish distal ends of antennae, beak, the tarsi, and, in some, slightly darker 

 extreme tips of the short cornicles. The body is lightly covered with 

 white powder. 



Alafe female, second generation, spring migrant, Plate XI, figs. 3, 3#, 



3*. y- 

 From examples taken May 20, 1908, at Fort Collins, Colo. 



General color above black, including legs (except proximal ends of 

 femora), cornicles, genital plates and antennae ; basal portion of the ab- 

 domen and most of the venter pale yellowish green ; the dark portion of 

 the abdomen seems really to be a very dark green, at least in younger 

 examples. Length of body 2.50 mm. ; wing 3.60 mm. ; antennae 1.20 

 mm.; joints of antennae about as follows : three .39 ; four .18 ; five .17 ; 

 six .09; seven .30 mm.; cornicles .20 mm. ; cauda .10 mm., very short, 

 and rather bluntly rounded ; cornicles nearly cylindrical, a little constric- 

 ted near the end, and with a moderate flange. Joints 3 to 6 of antenna 

 rather stout, joint 3 usually with about 16 circular, slightly tuberculate 

 sensoria of varying sizes, the number, however, is subject to considerable 

 variation ; joint 4 with 2 to 4, and joint 5 with i to 3 sensoria ; joint 6 very 

 abruptly constricted to the flagellum or yth joint. On the middle of the 

 lateral margin of the prothorax there is a short blunt tubercle and usually 

 a similar tubercle may be seen at the postero-lateral angle ; a similar but 

 shorter blunt tubercle occurs upon the lateral margins of each abdominal 

 segment before the cornicles ; on joint 8, just anterior to the base of the 

 cauda, is a pair of small tubercles that are nearly transparent and resem- 

 ble tuberculate sensoria ; beak barely attaining hind coxae ; no pronounced 

 antennal tubercles ; antennae, legs and body rather sparsely set with 

 short stout hairs ; hind femora swollen in distal half, where there are 20 

 or more sensoria. This is the first and only case I have known of senso- 

 ria occurring upon the tibiae of a spring migrant of any viviparous female 

 aphid. 



Winged viviparous female ; return migrant, Plate XI, figs. 4, ^a. 



The head, mesothorax, antennae, tibiae, and femora at their distal 

 ends, tarsi and honey tubes black ; prothorax and style dusky brown ; 

 wings hyaline, with the veins brown, stigma dusky, subcostal vein fully 

 twice as broad as the costal. The abdomen is rusty brown at base, with 

 darker transverse bands towards the cornicles, and is nearly or quite 

 black upon the middle of dorsal portion. Subanal plate black ; abdomen 

 rusty brown below, and about three black spots along either lateral mar- 

 gin ; style very short, about one-half as long as the tarsi. Length of body 

 2.7 mm. ; length of wing 4 mm. ; antennae 1.50-1.60 mm. ; cornicles .20 

 mm.; cornicles slightly larger towards the base. There is a small tuber- 

 cle on either side of the prothorax near the hind angles. The joints of 

 the antennae measure as follows : one .08 mm.; two .06 mm.; three .40- 

 .48 mm. ; four .22 mm. ; five .20 mm. ; six .10 mm. ; seven . 40-48 mm., 

 the seventh joint usually some longer than the third. Joints three, four 



