THE NEGRO BUGS. 65 



much as in nitiduloides. Sculpture of under surface as there, the 

 propleura minutely granulate. Front femora with two short spines on 

 apical third of lower surface. Length, 3 — 4.2 mm.; width, 3 — 3.5 mm. 



Lake, Starke, Putnam and Vigo counties, Ind., scarce, 

 March 20 — June 26. Hibernates beneath logs and in spring and 

 summer found on weeds in the vicinity of water. Ranges from 

 Ontario and Indiana to Colorado and Arizona. The types of 

 Dallas were from Hudson's Bay. Malloch (1919, 210) states 

 that it is found throughout Illinois, but not common, July 9- 

 Oct. 17. 



In form and sculpture nigra more closely resembles C. 

 ciliatus than any of our other species. The bases of pronotum 

 and scutellum are not transversely wrinkled as stated by Van 

 Duzee (1904, 6), but aciculately punctate and the surface has 

 a faint but evident brassy tinge. 



III. Corimel^na White, 1839, 539. 



Differs from Galgnpha mainly by the characters given in the 

 generic key. With the exception of anthracina our species have 

 the costal margin of elytra in part or wholly ivory-white. The 

 cheeks are usually slightly shorter than tylus ; pronotum im- 

 pressed on sides near hind angles, its margin at this point 

 nearly vertical ; scutellum with an impressed line on basal half 

 near the lateral margins ; hind tibiae with four rows of short, 

 widely placed spines and without a longitudinal carina. 



Six species are recognized from the eastern United States. 



KEY TO EASTERN SPECIES OF CORIMEL^ENA. 



a. Elytra wholly black; reflexed narrow side margins of pronotum obso- 

 lete before reaching the polished nodulose hind angles. 



28. ANTHRACINA. 



act. Elytra with yellowish-white markings along the costal margins, 

 these sometimes very short; reflexed side margins of pronotum 

 continued around the nodulose hind angles. 

 b. Hind tibiae with three or four spines on posterior dorsal face, 

 the basal one very small. 

 c. Pale border of elytra not widened near base. 



d. Larger, 3.5 — 4 mm. 29. lateralis. 



dd. Smaller, less than 2.5 mm. 30. marginella. 



cc. Pale border of elytra widened near base, crossing the sub-costal 



nervure onto corium ; horny costal margin of elytra with apex 



obtusely rounded; length, 2.5 — 3 mm. 31. pulicaria. 



