GENERIC CLASSIFICATION OF APHIDIDAE. 13 
ed with hairs. Some specialized forms have small cornicles or none 
at all. Wax-secreting structures, but no distinct gland areas, are 
present in this tribe and a coating of fine wax is often found over the 
entire insect, including the appendages. This is true of the oviparous 
forms, as well as of the viviparous ones. 
The cauda and anal plate are here rounded, never developed into 
elongate structures as in some of the other tribes of the subfamily. 
The sexual forms are nearly as unspecialized as the viviparous ones. 
Both sexes possess a distinct rostrum and take food. The males in 
the typical subtribes are winged. The females are apterous, but the 
ovaries are developed and several eggs are laid by each individual. 
Key to the Subtribes op the Lachnini. 
1. Radial sector of fore wings curved and of moderate length 2. 
Radial sector of fore wings short and straight, situated near the tip of the 
wing 4. 
2. Hind tarsi extremely elongate, head divided, wing venation usually faint. 
Tramina. 
Hind tarsi normal 3. 
3. Stigma short and thick, sexes both apterous Anoecina. 
Stigma elongate, males often winged Fterochlorina. 
4. Form elongate and very narrow; antennse with bristles, cornicles not hairy; 
eyes without ocular tubercles Eulachnina. 
Form not elongate ; cornicles on hairy cones; eyes with ocular tubercles . . Lachnina. 
Subtribe ANOECINA. 
The subtribe Anoecina is suggestive of the Tramina, but none of 
the forms are as specialized as some of the genera of that subtribe. 
The typical genus is quite distinctive in the short rounded stigma 
and in the sexual forms. The genus Nippolachnus, however, has 
a stigma quite Lachnus-iike in appearance. Only two genera are 
known at present. 
Key to the Genera of the Anoecina. 
1. Head not divided; eyes with prominent ocular tubercles; stigma of wing 
short and rounded Anoecia. 
2. Head divided; eyes without ocular tubercles; stigma long and straight. 
Nippolachnus. 
Genus ANOECIA Koch. 
Plate 1, A-F, I. 
1857,, A noecia Koch, Die Pflanzenlaiise Aphiden, p. 275. 
Characters. — Head not divided, front somewhat rounded. Eyes prominent but not 
distinctly set off from the head. Antennas of six segments, armed with sub circular or 
oval or elongate sensoria and covered with hairs. Fore wings with the media once 
branched. Stigma short and thick. Hind wings with both media and cubitus 
present. Cornicles situated on broad hairy cones. Cauda and anal plate somewhat 
rounded. 
Spring forms free, living in colonies; summer forms often subterranean. Sexes 
small and apterous, possessing beaks and feeding. Oviparous female laying one or 
more than one egg. 
Type (monotypical), Aphis corni Fab. 
