GENERIC CLASSIFICATION" OF APHIDIDAE. 31 
Characters. — Cornicles present as slightly elevated rings; antennae of six segments 
armed with subcircular sensoria. Eyes without ocular tubercles. Fore wings with 
the media twice branched, hind wings with the cubitus sometimes absent, cauda 
knobbed, anal plate divided, body with spinelike hairs. 
Forms living free upon grasses and sedges in moist localities. Sexes apterous, 
oviparous female producing several eggs. 
Type (fixed by Gillette, 1917), Brachycolus balli Gill. 
Genus SALTUSAPHIS Theobald. 
Plate IV, V, W. 
1915. SaltusapMs Theobald, Bull. Ent. Research, v. 6, pt. 2, p. 138. 
Characters. — Cornicles present, cup-shaped or truncate; antennae of five segments, 
minutely setose; sensoria small and subcircular. Head elongate, ocular tubercles 
absent. Fore wings with the media twice branched; hind wings with the cubitus 
usually absent; cauda knobbed; anal plate divided, caudal extremity of the abdomen 
sometimes bilobed; body covered with spines which are often modified into 
different shapes. 
Forms living more or less solitary upon the leaA T es of grasses or sedges in marshy 
regions. Sexual forms apterous, oviparous female laying several eggs. 
Type (monotypical), Saltusaphis scirpus Theo. 
Subtribe DREPANQSIPHINA. 
The subtribe Drepanosiphina is evidently related to the callip- 
terine branch of the tribe rather than the chaitophorine one. It 
has specialized in the opposite direction from the Monaphidina in 
that the cornicles are more or less prominently developed. It would 
appear to bear the same relation to this branch of the tribe as does the 
Pterocommina to the chaitophorine one. There is considerable 
variation in the development of the cornicles, even within certain 
of the genera. Some have very large cornicles, others have small 
ones. They all appear, however, to have the same general structure. 
Charade?^. — Cornicles present, varying greatly in development from very small to 
very large. Cauda somewhat knobbed, anal plate slightly indented. Oviparous 
female with a long drawn out ovipositor. 
Key to the Genera op the Dbepanosiphina. 
1. Cornicles extremely long and somewhat swollen in the middle Drepanosiphum. 
Cornicles not extremely long and larger atthe base 2. 
2. Cornicles very small, truncate Neosymydobius. 
Cornicles large with a swollen region at the base Drepan aphis. 
Genus DREPANAPHIS Del Guercio. 
Plate IV, JJ-LL. 
1909. Drepanaphis Del Guercio, Rivista di Patologia Vegetale, n. s., v. 4, no. 4, p. 49-50. 
1909. Phymatosiphum Davis, Annals Ent. Soc. America, v. 2, p. 196. 
The two generic names given were both used with the same type 
species, and therefore no discussion in regard to the use of the names 
is necessary. 
Characters. — Cornicles large but not of the same shape as those of Drepanosiphum, 
being rather narrow toward the distal extremity and swollen at the base. Antennae 
of six segments armed with subcircular or oval sensoria and a few scattered hairs. 
Fore wings with the media twice branched, hind wings with both media and cubitus 
present. Cauda knobbed, anal plate somewhat indented. Forms living more or less 
