NORTH AMERICAN COLEOPTERA. 23 



strongly angulated at the sides behind the middle, then concavely narrowed to the 

 base ; sides with a broad orange border. Scutel narrow, acvite, black. Elytra with 

 narrow side margin and broad transverse fascia, at the first fourth of the length 

 bright orange. Antennfe as long as the body. Mesosternum suddenly declivous 

 in front. Length 11 mm. 



One specimen, Bosque Co., Texas ; Mr. Belfrage. This is the smallest 

 Trachyderide known to me. 



PIJRPURICENUS Serv. 



P. diinifliatiiS. — Blaclv, oj^aque, densely and coarsely punctured, disc of 

 prothorax red, with a small dorsal callus, edges black. Elytra with the anterior 

 half red, basal margin black. Length IS mm. 



One female collected at Yreka, Gala., and kindly presented to me by Mr. 

 Duenkel ; the antennae are shorter than the body and not at all serrate. 

 The coarser and denser punctuation, and different coloration will enable 

 this species to be readily recognized ; it is much more Western in its 

 habitat than the other species of the genus. 



OXOPI.IIS Lee. 



O. marginatus Lee— A small female of this species (14 mm.) 



agrees perfectly with the large males from Lower California ; the antennae 



are a little shorter than the body ; this would indicate that 0. coralUnus 



in which the antenna? are comparatively shorter, and distinctly though 



not strongly serrate, must be retained for the present as a separate species. 



€ROSSIDIU$$ Lee. 



C. discoideus (Say). This species extends into Idaho and Ariz. 



PTEKOPI^ATUS Serv. 



P, diviSUS. — Ferruginous, antennte, tarsi, tip of middle and whole hind 

 tibire, abdomen and posterior half of elytra black. Prothorax strongly punctured, 

 disc flattened, sides with a well defined elliptical impression of a darker tinge. 

 Elytra cylindrical, orange colored deeply punctured, hinder half black, limited 

 by an oblique line running backwards from the suture. Length 9 mm. 



Dallas, Texas; Bolles. The elytra have four costae, and in form, size 

 and sculpture, this insect is precisely similar to P. floridanus. The hairs 

 are very few and short. 



P. rufipenn is.— Black, elytra reddish yellow, densely punctured, quadri- 

 costate, wider behind, and flattened on the disc. Protliorax as long as wide, seri- 

 ceous, densely punctured, disc flattened, ornamented with two red vittse, sides 

 impressed as usual, sub-angulated behind the middle. Head with a medial red 

 vitta extending into the mouth. Length 11-13 mm. 



Arizona, Mr. Morrison. The antenna3 are half as long as the body 

 and serrate in two specimens before me, one of which was collected near 

 Las Vegas, N. Mex. 



