290 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



minutely setose; sensoria small and subcircular. Head elongate, 

 ocular tubercles absent. Fore wing with the media twice 

 branched, hind wing with the cubitus usually absent. Cauda 

 knobbed, anal plate divided, caudal extremity of abdomen some- 

 times bilobed. Body often covered with modified spines. 



Key to Species. 



Body without prominent hairs excepting simple ones on the caudal 

 portion ; vertex strongly conical elongatus 



Body with knobbed hairs about 0.016 mm. long; vertex not strongly 

 conical americanus 



S. americanus Baker. (PL ix, i.) 



Can. Ent., xlix, 3, 1917. 

 S. elongatus Baker. (PL ix, 3.) 



Can. Ent, xlix, 4, 1917. 



Thripsaphis Gillette. 



Cornicles present as slightly elevated rings. Antennae of six 

 segments armed with subcircular sensoria. Eyes without ocular 

 tubercles. Fore wing with the media twice branched; hind wing 

 with the cubitus sometimes absent. Cauda knobbed; anal plate 

 divided ; body with spine-like hairs. 



Forms living free on sedges and grasses; sexes apterous; 

 oviparous female with large wax plates. 

 T. balli (Gillette). Brachycolus balli Gillette. 



Can. Ent., xl, 67, 1908. 



The only species recorded from New England. 



Tribe APHIDINI. 



The New England species belonging to the Aphidini according 

 to current usage fall into the following genera: Aphis, Anuraphis, 

 Brevicoryne, Hyadaphis, Hyaloptcrns, Liosomaphis, Mastopoda, 

 Rhopalosiphum and Siphocoryne. Perhaps the common character- 

 istic which comes nearest to separating them from the Macrosi- 

 phini is the absence of a distinct frontal tubercle at the base of the 

 antenna ; and there is a vague borderland even on this character 

 For the most part, however, there is no difficulty in distinguishing 

 the two groups. 



Aphis, Anuraphis, Brevicoryne, Hyalopterus. 



The four genera indicated and the others closely allied, on 

 account of the "borderland" species are still perhaps most easily 

 handled if keyed together. 



Key to Species. 



1. Hind wing with M and Cu both present a 



Hind wing with but one discoidal vein setariae 



2. Cornicle longer than ii or if not then cauda elongate 3 



