14 THE CANADIAN ENTOMOLOGIST. 



p. 25. This insect is a typical Aphis and lives in dusters. So far as I 

 know, all Callipterus are sporadic in habit. 



C. TRPFOLii n. sp. 



Apterous individuals : Tuberculate ; with capitate hairs. 



Winged individuals : Dorsum without conspicuous tubercles. Third 

 joint of antennae twice as long as the fourth ; fourth and fifth joints sub- 

 equal ; sixth and seventh joints sub-equal. 



Wings : Marginal cell hyaline. Veins bordered with brown. Basal 

 half of stigmal vein sub-obsolete and not thickened and dusky at base. 



Length of body .04-.05, of wing .07, of antennae .06 in. Clover 

 leaves. June. 



This species can be easily distinguished by the naked eye from C. punc- 

 tata, by having the veins more robust, and shaded not only at tip but for 

 their entire length. 



The American species may be distinguished as follows. With regard 

 to the species described by Fitch, see Riley & Monell, 1. c. p. 28. 



A. Dorsum of winged individuals with spine-like tubercles. . .C. ubnifolii 

 AA. Dorsum without spine-like tubercles. 

 a. Marginal cell dusky. 



b. Middle tibiae pale yellow. Femora pale yellow C. Walshii 



bb. Tibia black. Apical portion of femora black C. bella 



aa. Marginal cell hyaline. 



b. Wings with transverse, shaded bands. 



c. Abdomen with conspicuous dusky spots C. discolor 



cc. Abdomen yellow, concolorous, or with very faint transverse 



bands . . C. asclepiadis 

 bb. Wings sub-hyaline. 

 c. Nectaries distinct. 

 d. Wings not hyaline. 



e. Sixth joint of antennae half as long as seventh . . C. punctata 



ee. Sixth and seventh joints sub-equal C. trifolit 



dd. Wings hyaline. 



e. Apical joint of antennas a little longer than the sixth, veins 



whitish . . C. hyalinus 

 ee. Apical joint of antennos three times as long as the sixth. 

 First and second discoidals black ... .C. betuhxecolms 

 cc. Nectaries not perceptible. 



