:UG Annals Entomological Society of America [Vol. Ill, 



may be cither under or over developed and it is necessary to 

 ])lace the genera according to the greatest development. Of 

 all the characters which show this variation the wings show 

 what may be true of all the characters. 



Along these lines the subfamily has been divided into three 

 tribes as follows: 



A. Nectaries nearly as long as the body and with long hairs Trichosiphini. 



— Nectaries without hairs and not more than half as long as the Ijudy B. 



B. Nectaries variable in length but at least one fourth the length of the body. 



Antennae as long as the l)ody or longer and set on distinct antennal tuber- 

 cles. The antennae of Phorodon are shorter but the tubercles are greatly 

 developed Macrosiphini. 



— Nectaries variable in length; antennae usually shorter than the body and not 



set on distinct antennal tubercles. When tubt-rcles are j)resent antennae 

 and nectaries are much reduced Aphidini. 



Tribe Trichosiphini 



This tribe is limited to two genera both of which are found 

 in the Asiatic Islands. The nectaries are quite remarkable in 

 that they are covered with long hairs. In other respects they 

 are not so different from the genera of the other two tribes. 



I. Antennae not longer than the body and the cubital vein twice forked. 



Trichosiphum. 

 i I. Antennae longer tlian the body and the cubital vein with but onu t'ork. 



Greenidea. 



Gen. Trichosiphum Pergande 

 type anonae Pergande. 



Antennae about as long as the body, six, segmented, and fixed 

 on large tubercles; spur of sixth segment shorter than third 

 segment; first segment gibbous. Antennal tubercles slightly 

 tapering but not gibbous being oblique to the forehead which is 

 nearly flat. Body elongate and narrow; stigma of wing long 

 and slender; cubitus twice forked. Nectaries as long as the 

 body cylindrical, and standing out at right angles to the body. 

 Cauda short and triangular; anal plate short, half moon shaped. 

 Antennae, legs, and nectaries as well as the body covered with 

 long l^ristle like hairs. 



Apterous female: — Body short, robtist, with antennae one 

 half the length of the body; six segmented, with small antennal 

 tubercles. Nectaries one fourth the length of the body and 

 vasiform. Cauda short and broadly rounded; anal plate broad 

 and slightly emarginated at the center. Antennae, nectaries, 

 legs and body exceedingly hairy. 



