Horn.J d_U [June 20, 



ternal entirely absent, humeral very finely impressed ; surface at apex 

 very sparsely and rather finely punctate, becoming rapidly sparser and 

 finer to apex. Anterior tibia? finely serrulate, middle and hind tibiae 

 spinulose. Presternum broad, moderately convex, striae parallel, hori- 

 zontal and attaining the apical four-fifths. Length .12-. 14 inch ; 3-3.5 

 mm. 



Occurs at San Diego, California. 



S. Copei, n. sp. 



Broadly oval black, shining, legs and antennae reddish-brown, club 

 darker. Head moderately, neither densely nor coarsely punctured. 

 Thorax sparsely and finely punctured at middle, more densely and very 

 coarsely punctured toward the sides and at margin more sparsely ; along 

 the base with coarse punctures, and in front of scutellum a slight 

 depression. Stria} of elytra coarsely punctured, first dorsal extending to 

 apical four-fifths, second and third equal and nearly as long, fourth ex- 

 tending slightly beyond the middle, arching at base, and joining the 

 sutural which is as long as the first dorsal ; oblique humeral very fine, 

 internal subhumeral entirely wanting, external subhumeral one-filth the 

 length of the elytra, distinctly impressed, and joining the marginal in 

 front ; surface at apical third coarsely but not densely punctured, punc- 

 tures becoming rapidly finer near the base, and also near the first stria' 

 Propygidium and pygidium coarsely and rather densely punctured, the 

 latter much more finely at apex. Presternum moderately convex. 

 sparsely punctured, stria? strongly impressed, very feebly divergent in 

 front, and very slightly ascending. Anterior tibia? finely multidenticu- 

 late, middle and hind tibia? finely spinulose. Length .14 inch ; 3.5 mm. 



By the slightly divergent and slightly ascendant prosternal stria?, this 

 species tends toward the next group. The stria? extend four-fifths to 

 apex. The presternum in front has on each side a slight fovea. Among 

 the species of the group it most closely resembles posthumus, from which 

 it differs by its more coarsely punctured thorax, more finely punctured 

 elytra, and differences in the elytral and prosternal stria? as noted above. 



Dedicated to Prof. E. D. Cope, by whom it was collected in the region 

 of Fort Bridger, Wyoming Territory. 



Group V. 



Presternum broad at summit moderately convex, stria? divergent in 

 front and ascending, but not terminating in a fovea in front. Head with 

 distinct supra-orbital stria extending slightly along the front. 

 Indexed portion of elytra bistriate ; fourth dorsal not 



arched at base, punctured space of elytra opaque .... alienus. 



Inflexed portion of elytra bistriate ; fourth dorsal arched 



at base, and usually joining the sutural, punctured 



region not opaque. 



