20 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 
Genus NEOTRAMA, n. gen. 
Plate III, M, O. 
Head somewhat fiat. In the apterous form the eyes reduced ; antennae of six segments? 
and the cornicles on very small cones with a few scattered hairs. Cauda sub conical , 
rounded. Anal plate rounded. Entire body covered with fine hairs. Hind tarsi 
greatly elongate. 
Type, Trama troglodytes Del Guercio (=Neotrama delguercioi Baker). 
Tribe THELAXINI. 
It has been the custom of most writers to place the Thelaxini 
(Vacuini) in the Eriosomatinae, often possibly because of the fact that 
only one egg is laid by the oviparous female. But the female is quite 
different in structure from the beakless females of the Eriosomatinae 
and the other forms are very different indeed. 
With the Hormaphidinae there are more resemblances, the most 
striking of which is the structure of the thorax. The mesothorax 
indicates very faintly the lobes so prominent in most forms. The 
presence of distinct cornicles, however, is very different from the 
forms in the Hormaphidinae lacking these although possessing a some- 
what similar thorax. 
The sensory structures, too, are widely different, being similar to 
those found in the Phyllaphidina. Indeed, the antennae are very like 
those of that subtribe. The oviparous forms of the Phyllaphidina, 
however, lay several eggs and may be either winged or apterous and 
the males, though sometimes apterous, are usually winged. The 
venation of the Thelaxini is more reduced than in the Phyllaphidina. 
Taking all of these facts into consideration it seems evident that the 
Thelaxini should be placed in the Aphidinae and somewhat related to 
the Phyllaphidina, a subtribe which belongs in the Callipterini. It is 
evident, however, that the Thelaxini must stand somewhat apart; 
it is placed, therefore, as a tribe of the subfamily Aphidinae next to 
the Callipterini. In this tribe the specialization of the ovipara has 
advanced beyond that of the Callipterini in that only one egg is laid, 
but according to Buckton several eggs may be laid and the distinct 
beak is evidence of relationship. 
Characters. — Cornicles present as chitinized rings on shallow hairy cones. An- 
tennse somewhat setose, with oval or subcircular sensoria. Cauda somewhat semi- 
circular or distinctly knobbed. Body usually armed with hairs or stout spines. 
Sexual forms small and apterous, possessing beaks; oviparous female as a rule laying 
only one egg. 
Forms living free upon the foliage. 
The genera may be separated by the following key: 
Key to the Genera op the Thelaxini. 
Cauda distinctly knobbed Thelaxes.. 
Cauda not knobbed but somewhat semicircular Glyphina. 
