PROC. ENT. soc. WASH., VOL. 22, NO. 3, MAR., 1920 53 



tending to form rows; apical portion smooth, very finely punctured. The 

 fine punctures are extended to the base among the coarse ones, and each 

 bears a short black bristly hair. Under parts polished, finely and sparsely 

 punctured, metasternum with a deep median longitudinal groove reaching 

 two-thirds to the mesosternum. Legs rufous, very densely pubescent. Claws 

 with basal tooth, as in the genus. 



Hab. Venodio, Sinaloa, Mexico, June 27-August 14. A. 

 Kusche, collector. 



Type. No. 22556, U. S. N. M. 



Described from fifteen specimens taken at Venodio between the 

 above-mentioned dates. It is possible that this species is the one 

 mentioned by Gorham (Biol. Cent. Amer. Col., Vol. 3, Pt. 2, 

 Suppl. p. 345) as a variety of 0. damicornis Fabr. Its affinities 

 are, however, with 0. texana. These three species may be sep- 

 arated by the following table : 



Lateral margins of prothorax sinuate, punctuation not dense 



damicornis Fabr. 



Lateral margins of prothorax parallel. 



Punctuation of pronotum dense and evenly distributed. . .texana Bland. 



Punctuation of pronotum sparse, slightly more dense at side 



cyanipennis n. sp. 



An additional character for distinguishing the sexes in the 

 species of Orthoplevra may be found in the distance separating 

 the eyes. In the male the eyes are much closer together in front 

 than in the female. This character used in connection with that 

 of the antennae should be sufficient to always distinguish the sex 

 of a specimen. 



Corinthiscus sinaloae, new species. 



Form rather broad and depressed, slightly broader toward apex. Piceous, 

 elytra pale, basal region of elytra piceous, humeri rufous, subapical band 

 rufous edged with piceous. Head piceous, moderately coarsely and very 

 densely punctured, eyes prominent, coarsely granulate, head between the 

 eyes depressed, vertex distinctly swollen, in some specimens very obsoletely 

 carinate. Antennae rufous, basal segment sparsely punctured, club piceous 

 except for apical half of eleventh segment, finely pubescent; palpi rufo-tes- 

 taceous. Thorax rufo-piceous, longer than wide (25:21), sides parallel, sud- 

 denly narrowed near base, disk with a short deep median longitudinal groove, 

 limited behind by a smooth raised space and with four shallow depressions 

 on either side of the median line; surface very coarsely and quite densely 

 punctured. Elytra with very large and deep pit-like punctures, which are 

 scattered, surface between the punctures very smooth and shining; color pale 

 stramineous, basal fourth piceous, just beyond this patch of color is a trans- 

 verse undulating, very narrow piceous line, more or less broken. The humeri 

 are rufous. On the apical fourth there is an irregular transverse band of 



