AMERICAN COLEOPTERA. G9 



Contributions to the COLEOPTESOLOGY of the United Statss. 

 BY GEO. II. HORN, M. D. 



CALOSOMA, Fabr. 

 C. Haydeni, n. sp. 



Tlio above name is proposed f.)r a species in which tho first three 

 joints of the anterior tarsi of the mile are spoagy pubescent beneath, 

 the base of thorax truncate. It is therefore allied to our trUte and 

 obsoletum, but differing from them in having the elytra connate and 

 the body apterous. The head is large, as in triste, and the frontal 

 impressions deep, rather finely punctured and wrinkled ; vertex with 

 but few punctures, occiput smooth. Thorax as in frisfe, but with the 

 basal impression deeper and the lateral margins at base more strongly 

 reflesed, nearly as much as in semilaeve. Disc with distinct coriace- 

 ous sculpture and feeble median line, margins coarsely but distantly 

 punctured, becoming more dense near the hind angles and basal 

 region. Elytra elongate oval, humeri strongly rounded, and as dis- 

 tinctly margined as the sides. Surface very convex in both directions 

 and with striaj of fine distinct punctures feebly impressed. Basal 

 region with distant sub-muricate punctures. Margins distinctly mu- 

 ricately punctured, more dense at the humeral region, almost disap- 

 pearing at the apex. Metathoracic parapleurae and sides of abdomen 

 with coarse punctures. Its color above and beneath is shining black. 

 Length .84 inch; 22 mm. 



Collected in Southern Colorado, by C Thomas, of the U. S. G-eolog. 

 Survey, under Dr. F. V. Ilayden. 



This species must be referred to the same group with C polition, 

 (?haud., which I have had an opportunity of examining, through the 

 kindness of M. A. Sall6, of Paris, from which it differs (besides the 

 sculpture,) iu its greater general convexity, broader and more strongly 

 reflexed thoracic and elytral margins. In politum the basal thoracic 

 impressions are scarcely at all evident. In accordance with the ar- 

 rangement of our species published by Dr. Leconte, Proc. Acad, 1802, 

 p. 52, this species should be placed as a subdivision of group IV. 

 Both sexes are known to me, the female having slightly broader elytra. 



C. tepidum, Lee. 



Specimens collected by me at Sacramento, Cala., differ from the 

 Oregon type in being entirely black. The thoracic and elytral sculp- 

 ture is rougher, and in many specimens the large punctures usually 

 golden or bronzed, seen in the Oregon specimen.s, are here totally 

 obliterated. 



TllANS. AMEH. E.NT. SOC. (10) .IINE, 1S70. 



