42 KANSAS UNIVERSITY SCIENCE BULLETIN. 



mounted with a single spinous hair. Thorax bluish green ; 

 wings pellucid and smoky ; veins black margined with black, 

 smoky borders one-half to two-thirds as wide as the stigma. 

 Stigma concolorous with the vein borders ; 0.19 mm. broad and 

 0.72 mm. long. Sometimes the costal cell is also colored with 

 the same coloration as the stigma. Total wing expansion, 6.52 

 mm. Legs dark green or brown, which is not uniform through- 

 out their length ; the distal end of the hind tibia being the 

 lightest in color. All hirsute and normal in length except the 

 hind tibia, which is long. 



Abdomen bluish green, somewhat hirsute, but not armed 

 with hairs as is the apterous form. Instead of the spines are 

 small tubercles. Dorsal part of the abdomen marked with 

 about seven dark transverse bars. Each lateral margin has the 

 same color in the form of spots. Honey-tubes dusky, clavate, 

 with wide-open mouths. Length, 0.09 mm., equal to the style 

 in length, but not half as long as the tarsi. Style globular, 

 hirsute, light in color, 0.09 mm. long. Equal in length to the 

 tarsi. Anal lobes prominent, hirsute, a little larger than the 

 knob of the style. Total length of the body, 2.08 mm. This 

 form was taken on the elm {Uhims americana) . The winged 

 forms appeared about May 20. It is gregarious in habit and 

 colonizes the ventral side of the leaves. A variation of this 

 species is shown on plate VII, figure 46. 



Tribe APHIDINI. 



Antennae moderately long, hardly ever longer than the body. 

 Frontal tubercles rarely present, and very conspicuous when 

 present. Seven-jointed (except in MuHtopuda) . Eyes with 

 ocular tubercles. Beak moderately long. Legs moderately 

 long and well developed. Abdomen never very long, compact, 

 and somewhat rounded caudally. Honey-tubes generally cyl- 

 indrical or slightly incrassate, rarely tuberculate or obsolete. 

 Style conical, generally well developed, rarely obsolete. This 

 tribe is gregarious, and is found on the leaves, tender stems, 

 and, in rare cases, on the roots of plants. 



Genua Hyalopterus Koch.''' 



Vertex flat. Antenn;e about as long as the body. Sensoria 

 small and irregularly placed. Eyes dark red. Beak short. 



19. No representative iu text. 



