GENERIC 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 lings. Head without prominent antennal 
tubercles. Antennae of six segments, sensoria 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 op 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. 
