Vol. 35, pp. 55-58 March 20, 1922 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW NORTH AMERICAN HYDNOCERA (COL.). 

 BY EDWARD A. CHAPIN. 



The genus Hydnocera Newm. is one of the largest and most 

 unwieldy of the American genera of Cleridae. All of the species 

 are small and while there are characters present which will serve 

 to break it up into natural groups, such work should be under- 

 taken only after study of a comparatively large part of the 

 species and especially of the Central and South American repre- 

 sentatives. The present author has made two such segregates, 

 Isohydnocera and Wolcottia; however, this is but a beginning. 

 It might be stated here that Hydnocera cnjptocerina Gorh. is 

 closely allied to Isohydnocera albocincta Horn and should be 

 transferred to this latter genus, though both species represent 

 a type quite apart from 7. curtipennis (Newm.) and will 

 ultimately be separated as a distinct genus. 



The species described below are all North American and fall 

 within the present limits of Hydnocera Newm. I am much 

 indebted to Mr. A. B. Wolcott for the privilege of describing 

 those species which are stated to be from his collections and to 

 Mr. L. L. Buchanan of the United States Biological Survey for 

 the type of H. iowensis, n. sp. 



Hydnocera colbaltina, n. sp. 



Elongate, nearly parallel; above cobalt-blue, under parts, femora, 

 posterior tibiae blue-black. Antennae, mouth parts, anterior and middle 

 tibiae and all tarsi piceous. Head blue, densely but not coarsely punctate, 

 vertex finely rugose, pubescence fine, not dense, suberect, brownish, with 

 a few erect black hairs scattered over the surface. Eyes large, moderately 

 convex. Thorax equilateral, (30-30); densely rugose-punctate; lateral 

 dilation very weak; foveae obsolete; apical transverse impression fine, 

 distinct, basal moderate, pubescence not dense at sides, sparse on disk, sub- 

 depressed, brown. Elytra as long as the abdomen; toward tips dehiscent 

 at suture; tips separately rounded and rather coarsely serrate, very densely, 

 evenly and confusedly punctate, pubescence sparse, suberect, brown, 

 11— Pkoc. Biol. Soc. Wash., Vol. 35, 1922. (55) 



