I06 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



fourth; clypeus distinctly emarginate; median fovea large, 

 shallow, circular; wings infuscated on basal half. Length 

 6 mm infuscatus 



2. Basal plates black 3 



Basal plates white; body black, with edge of clypeus, labrum, 

 tegulse, collar, median lobe of mesonotum, lateral lobes 

 in part, a band on the four basal segments of the tergum, edge 

 of three apical segments, and legs, except a band on hind ' 

 femora and the hind tarsi, white; third and fourth seg- 

 ments of antennae subequal. Length 6 mm. (female) 



albidovariatus 



3. Median lobe of mesonotum in great part white (male) albidovariatus 

 Median lobe of mesonotum with white lines, short and 



obscure phytophagicus 



°C. infuscatus MacGillivray. 



°C. albidovariatus (Norton). Hemichroa alhidovariata Nor- 

 ton. Howard, Insect Book, PI. xiv, Fig. 19 (female). Larva 

 feeds on black oak. 



°C. phytophagicus (Dyar). Hemichroa phytophagica Dyar. 

 Larva feeds on white oak. 



Hemichroa Stephens. 



°H. americana (Provancher). Dineura americana Provan- 

 cher. 



Scutellum polished, impunctate; body of female rufous, with 

 metathorax, antennae, coxae, trochanters, front femora at base, 

 middle and posterior femora, tibiae at tip, tarsi, and saw-guides, 

 black; tibiae white; wings infuscated, paler at apex; pentagonal 

 area indistinct, walls flat; median fovea shallow, elongate; third 

 and fourth segments of the antennae subequal ; body of male black, 

 with legs beyond coxae and tegulae rufous. Length 5.7 mm. 

 Larva feeds on alder; gregarious. 



H. fraternalis Norton. 



Scutellum uniformly finely punctate; body of female with 

 the median lobe of the mesonotum, the lateral lobes in part, a 

 large spot on the mesopleurae, the venter of the abdomen, the basal 

 plates, and more or less of each of the other tergal segments, 

 rufous; prothorax for the most part, the tegulae, the legs 

 except the posterior femora, and the costa and stigma, white; 



