72 KANSAS UNIVERSITY SCIENCE BULLETIN. 



base. It is 0.14 mm. long, being about one-third the length of 

 the honey-tubes. Total length of the body, 3.60 mm. Mr. 

 Pergande identifies this as a new species of Macrosiphum. 



This form was taken July 22, on a plant which was destroyed 

 before it could be identified. The species is gregarious, and 

 colonizes the tender, growing parts of the plant. From the 

 specimens the anomalous features of the wing venation may be 

 seen. On about ninety per cent, of the individuals studied the 

 venation appeared as shown on the slide, where in the remain- 

 der a frequent slight third branching of the third discoidal was 

 noticed. In one specimen it was nearly perfect on one wing. 

 Also the appearance of a single discoidal on the caudal wing 

 was noticed in a few specimens, but in none was it perfect. 

 The relative size of the caudal wing is very noticeable. With 

 the exceptions of the abnormalities of the wings, this form ap- 

 pears to be a very good representative of the genus Macrosipluim. 

 The apterous forms could without doubt be classified as dis- 

 tinctly of this genus. 



Macrosiphum sp. ? Plate XIX, fig. 90. 



Head and basal joints of the antenna^ dark brown. Antennae 

 black and hirsute ; length of segments : I, 0.14 mm. ; II, 0.09 

 mm. ; III, 0.82 mm. ; IV, 0.80 mm. ; V, 0.70 mm. ; VI, 0.18 

 mm. ; VII, 1.00 mm. ; total length, 3.73 mm., or about twice 

 the length of the body. Sensoria circular, irregular in size and 

 numerous ; on the third joint fifty or more, on the fourth twelve, 

 and nearly in a straight row ; ten to fifteen on the fifth ; a 

 cluster of seven of equal size and a larger one at the distal end 

 of the sixth. Eyes black ; ocular tubercles prominent ; ocelli 

 normal. Beak dark, 0.80 mm. long, and extends to the mesocoxip. 



Prothorax dark brown, cephalic margin black. Thorax of a 

 darker brown. Wings hyaline, discoidals dark brown, costals 

 light brown. Stigmadark brown, 0.19 mm. broad and 0.90 mm. 

 long. Total wing expansion, 6.52 mm. Legs black, except 

 proximally from the center of the femora, which is yellowish 

 brown. 



Abdomen dark brown. Honey-tubes black, imbricated, and 

 0.45 mm. long, being twice the length of the tarsi. Style hir- 

 sute, concolorous with the abdomen, widest near the middle and 



