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. Saltusaphis 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 leaves of grasses or sedges in marshy 

 regions. Sexual forms apterous, oviparoiis female laying several eggs. 



Type (monotypical), Saltusaphis scirpus Theo. 



Subtribe DREPANOSIPHINA. 



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. 



Characters. — 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 Drepanosiphina. 



1. Cornicles extremely long and somewhat swollen in the middle Drepanosiphum. 



Cornicles not extremely long and larger at the base 2. 



2. Cornicles very small, truncate Neosymydobius. 



Cornicles large with a swollen region at the base Drepanaphis. 



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 Avings with both media and cubitus 

 present. Cauda knobbed, anal plate somewhat indented. Forms living more or less 



