1873.] &*■* [Horn. 



humeral short, external subhumeral very short, basal, and close to the 

 marginal stria, marginal stria strongly impressed, epipleural obsolete ; 

 surface between the striae 1-4 sparsely punctured from the base, becom- 

 ing gradually more dense toward the apex and forming a narrow space 

 along the apex. Pygidium and propygidium moderately punctured. 

 Anterior tibiae 5-dentate, middle and hind tibiae uniseriately spinulose. 

 Mesosternal stria obsolete anteriorly. Length .12 inch ; 3 mm. 



The elytral punctures extend not only in the space indicated, but also 

 along the suture and base, the sides of the elytra beyond the first stria 

 are nearly smooth. The smooth space between the fourth dorsal and 

 sutural is of oblong form and on each elytron more than twice as wide as 

 long. One specimen in my cabinet has the third elytral stria single and 

 not duplicated as in the type, and this character is not of specific value. 



This species is thus far rare in California. PI. v. fig. 6. 



Group IV. 

 Prosternum broadly convex, striae at base slightly divergent, then 

 parallel or nearly so, horizontal and abbreviated in front, prosternum in 

 front not narrowed, and on each side with a slight fovea. 



The following table will aid in distinguishing the species : 

 External subhumeral not distinct from the marginal stria. 



Internal subhumeral stria entirely absent pect oralis. 



External subhumeral stria distinct from the marginal. 

 Internal subhumeral distinct and moderately long. 



Prosternum at summit moderately convex, striae long, in- 

 ternal subhumeral strongly impressed obscurus. 



Prosternum carinate, striaj very short, internal sub- 

 humeral very tine Florida?. 



Internal subhumeral replaced by a row of coarse, discon- 

 nected punctures posthumus. 



Internal subhumeral entirely absent. 



Thorax finely and sparsely punctured at sides ; elytra 



finely punctured peeminosus. 



Thorax coarsely punctured at the sides, elytra at apex 



coarsely punctured Copei. 



The external subhumeral stria in this group is always very short, basal 

 and joined by its basal end to the marginal stria. In thecase of pectoralis 

 the presence of that stria is only known by the marginal being slightly 

 deeper at base. In posthumus and Florida 'the external subhumeral is 

 very close to although distinct from the marginal stria, in all the rest of 

 the species the two striae are very distinct. Increased collections will 

 undoubtedly decrease the number of the species, two of them may how- 

 ever be known with certainty, pectoralis by the prosternal striae long and 

 convergent in front, and floridce by the prosternum carinate between the 

 striae. 



S. pectoralis, Lee. Ann. Lye. V., p. 166. 



Piceous black, shining ; legs and antennae reddish-brown. Head 



