io6 



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, 



tegulae, 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 antennas 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 albidovariata 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, antennse, 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; 



