GENEEIC CLASSIFICATION OF APHIDIDAE. 25 



The writer has studied a series of specimens of this species taken in 

 1907 on Celtis sinensis. There seems little doubt that the genus is 

 related to Phyllaphis. The dorsal wax glands are of much the same 

 structure as those found in fagi L. The deeply cleft anal plate, 

 however, at once separates the two. The cauda which is almost 

 cylindrical in some specimens is quite distinctly knobbed in others. 



Characters. — Cornicles present as mere rings. Head without prominent antennal 

 tubercles. Antennae of six segments, sen soria elliptical. Fore wings with the media 

 twice branched, hind wings with both media and cubitus present. Cauda cylindrical 

 or knobbed. Anal plate deeply divided. Males winged. Oviparous females apter- 

 ous. Rows of wax glands present. 



Type (monotypical), Shivaphis celti Das. 



Subtribe CALLIPTERINA. 



The subtribe Callipterina is a somewhat large and interesting 

 one. Some of the species are very large and more or less solitary, 

 others are small and live in colonies. In some genera apterous 

 viviparous forms, with the exception of the stem mother, seldom 

 occur, while in other genera they are as a rule, present. The males 

 are in most cases alate and the oviparous forms apterous. The species 

 of nearly all the genera live upon the leaves of plants. They do not 

 affect these greatly, as a rule, although when abundant the insects 

 often seriously interfere with the proper development of the trees 

 attacked. Many of the insects are armed upon their bodies with 

 prominent spines or tubercles. 



Characters. — Cornicles present, truncate in form. Antennae with setae or spines, 

 of six segments, and armed with subciroular or in a few cases somewhat elongate sen- 

 soria. 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 

 spines or tubercles. 



Key to the Genera of the Callipterina. 



1. Cauda distinctly knobbed, anal plate usually bilobed or sometimes deeply 



divided 3. 



Cauda not distinctly knobbed, anal plate entire or almost so 2. 



2. Antennae minutely setose, sensorium at base of unguis oval or somewhat 



rounded; oviparous female with secondary sensoria Symydobius. 



Antennae not minutely setose, sensorium at base of unguis long and narrow, 

 oviparous female without secondary sensoria Euceraphis. 



3. Anal plate deeply divided with a U-shaped cleft so that the lobes appear 



as distinct; cauda knobbed Therioaphis. 



Anal plate bilobed, not deeply divided; cauda very markedly knobbed. . . 4. 



4. Antennae and often the cornicles with prominent hairs Callipterus. 



Cornicles and antennae without such hairs 5. 



5. Cornicles much reduced; wings sometimes horizontal in repose Monellia. 



Cornicles truncate, fairly well developed; wings not horizontal in repose ... 6. 



