'A24 Annals Entomological Society of America [Vol. III. 



Gen. Hyalopterus Koch 



type aiirantiac Koch. 



Antennae shorter than the body, third segment as long as 

 the spur of the sixth; first segment strongly gibbous on the 

 inner side. Frontal ocelli prominent, forehead slightly raised 

 at the base of each antenna. Body long and slender, wings 

 also long and slender with cubitous twice forked. Nectaries very 

 short and slender, being slightly swollen in the middle. Cauda 

 twice as long as the nectaries and tapering to a blunt point, 

 slightly constricted near the middle. Anal plate broadly rounded. 



Gen. Brachycolus Buckton 



type A. stcllariae Hardy. 



Antennae shorter than the body, third segment as long as 

 the spur of the sixth; first antennal joint slightly gibbous. Body 

 slender, wings long and slender and with the cubitus twice 

 forked. Nectaries very short, being as long as broad and 

 cylindrical. Cauda about twice as long as the nectaries and 

 slender, tapering to a blunt point. Anal plate rounded and 

 not distinct from the l)ody. 



Gen. Microsiphum Cholodkovsky 



tyjx' phii'niicac Cholod. 



Antennae about as long as the body and set on distinct 

 tubercles, spur of sixth segment six times as long as the segment 

 and longer than the third segment, first segment slightly 

 gil)l)Ous on the inner side. Forehead broad, body large and 

 robust. Wings long and broad, cubitus twice forked. Nec- 

 taries very short, being slightly shorter than the second antennal 

 segment and flanged at the end like that of a horn. Cauda 

 wide, exceedingly short and triangular in form. Anal 

 plate barely distinguishable as a broad elevation. The only 

 American form of this genus is the species which T. A. Wil- 

 liams called Cryplnsiphum canadoise, taken on Artcmisae 

 ludovicianae* 



* Special Bull. Xo. 1. I)c'i)t. of Entomology, University of Nebraska, July 8, 

 1M»1. 



