44 KANSAS UNIVERSITY SCIENCE BULLETIN. 



of the distal end of the style. Style in our species apparently 

 short but in British species long. 



Genus Rhopalosiphum Koch. 



Vertex flat or slightly convex. Antennae about as long or 

 loncrer than the body, on remote small and inconspicuous frontal 

 tubercles. Beak generally moderately long, but variable in 

 length. Prothorax with no lateral tubercle. \¥ings moderately 

 long, venation normal. Legs short and robust. Honey-tubes 

 incrassate, or clavate. Style conspicuous, variable in size, 

 sometimes small and slender, but often large. 



Sipha rubifolii Thomas. Plate VIII, fig. 50. 



Head black; antenn^T light brown, imbricated. Length of 

 segments : 1,0.05 mm. ; II, 0.05 mm. ; III, 0.308 mm. ; IV, 0.09 

 mm.; V, 0.128 mm.; VI, 0.19 mm.; total length, about 0.9 

 mm., extending about the length of the style beyond the abdo- 

 men. Sensoria circular, rather large ; number on the third 

 joint, two to six in a row, one at the distal end of the fourth, 

 six small and one large at the distal end of the fifth. Eyes 

 black ; ocular tubercles of a reddish tinge. Ocelli prominent. 

 Beak dark brown, 0.36 mm. in length, and extends a little be- 

 yond the mesocoxir. 



Prothorax dark brown, cephalic border black ; thorax black ; 

 wings hyaline, veins light brown and frail. Stigma very light 

 brown, 0.54 mm. long and 0.18 mm. broad. Total wing ex- 

 pansion, 3.96 mm. Legs light brown, slightly hirsute ; tarsi 

 and femora a little darker than the tibia, which is very long in 

 proportion to the remainder of the leg. 



Abdomen light brown; honey-tubes imbricated, concolorous 

 to the abdomen, almost cylindrical, and 0.145 mm. long. Style 

 concolorous with the abdomen, conical, hirsute, and 0.09 mm. 

 long, being about a third the length of the honey-tubes. Aver- 

 age length of the body, 0.90 mm. 



This form was taken May 7, at Girard, on the cultivated black- 

 berry {Ruhas villosusf) . It is gregarious on the ventral side of 

 the leaves. 



In Thomas's description of this aphis,-" he did not have enough 

 material to thoroughly satisfy his curiosity, it seems. Particu- 



20. Tbomas, Kept. Ent. Ill.,8: r21. 122, 1880. 



