274 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



Subtribe Callipterina. 



Cornicles present, truncate in form. Antennae with setae or 

 spines of six segments and armed with subcircular or in a few 

 cases somewhat elongate sensoria. Wings often clouded, mottled 

 or banded. Cauda as a rule knobbed, anal plate usually more or 

 less indented or bilobed. Body often armed with capitate hairs 

 or soines. 



Monaphi^ina 

 Prepanaphidina 



PhyllapTiidina 



Chaitophorina 



Fig. 27. Derivation of Callipterine aphids. Drawing by Dr. A. C. Baker. 



3. 



4. 



Key to Genera. 



Cauda not distinctly knobbed ; anal plate entire or nearly so 2 



Cauda distinctly knobbed; anal plate bilobed or sometimes deeply 



divided 3 



Antennae minutely setose, sensorium at base of imguis oval or 



somewhat rounded; oviparous female with secondary sensoria .. 



Symydobius, p. 280 

 Antennae not minutely setose; sensoriimi at base of unguis long 



and narrow, oviparous female without secondary sensoria 



Euceraphis, p. 277 

 Anal plate bilobed, not deeply divided, cauda distinctly knobbed . . 4 

 Anal plate deeply divided with a U-shaped cleft, lobes somewhat 



separated at base ; cauda knobbed, often somewhat elongate .... 



Therioaphis, p. 281 

 Cornicles truncate, fairly well developed ; wings not held horizontal 



in repose 5 



Cornicles reduced almost to mere rings; wings sometimes held 



horizontal in repose Monellia, p. 279 



More or less distinct antennal tubercles present, oviparous female 



with secondary sensoria ; radial sector often absent Calaphis, p. 275 

 No distinct antennal tubercles present, oviparous female without 



secondary sensoria ; radial sector usually present Myzocallis, p. 279 



