142 NORTH AMERICAN 



Somewhat obscure; ocular lines meeting at fully one length in advance; 

 antennae very slightly longer than the width of head, robust, nearly black, 

 club rather small ; third, fourth, and fifth joints exactly equal, sixth very 

 slightly shorter, just perceptibly longer and distinctly more slender than the 

 seventh, eighth as wide as the seventh, slightly elongated, conical, joints of 

 club increasing in length, tenth much the most robust ; maxillary palpi long, 

 first joint pale piceo-testaceous, second slender, piceous-black, third strongly 

 clavate, black. Prothorax widest just before the middle, where it is five- 

 sixths as wide as the head, and slightly narrower than long ; sides thence 

 moderately convergent posteriorly and rather strongly sinuate ; anterior 

 margin very slightly longer and more arcuate than the posterior ; surface 

 distinctly tuberculate at a slight distance from the basal angles, longitudi- 

 nally impressed on the flanks at the widest section, transversely and dis- 

 tinctly impressed just behind the apex ; very closely, finely, obscurely, and 

 rugulosely punctate ; eanaliculation strong, fusiform, rather roundly im- 

 pressed, bottom punctate, beginning at one-fourth the length from the vertex, 

 terminating at one-eighth the length from the base. Elytra at base as wide 

 as the head ; sides parallel, longer than the width at base, strongly arcuate 

 posteriorly, more feebly so near the humeri ; together broadly, deeply, and 

 evenly emarginate behind ; suture one-fourth longer than the pronotum ; 

 surface feebly impressed on the suture at the base, finely, deeply, extremely 

 closely and irregularly channeled ; channels generally strongly arcuate out- 

 wardly, having a generally longitudinal direction. Abdominal segments 

 uniformly and rapidly decreasing in width, first much narrower than the 

 contiguous elytra, cylindrical ; surface very closely, coarsely, variolately, 

 and evenly punctulate, feebly shining ; lateral border very feeble except on 

 the first segment, where it is distinct ; transverse carinae tricuspid, cusps 

 rather approximate, long and acicular, prominent, and exactly equal in 

 length. Legs rather long and slender, blackish- fuscous ; first joint of the 

 posterior tarsi two-thirds longer than the second, as long as the second and 

 third together, and very slightly shorter than the last, joints two to four 

 uniformly and gradually decreasing in length. 



Mule. — Fifth ventral segment just perceptibly emarginate in its middle 

 sixth at apex ; sixth sinuate at apex, sinus much broader than the apices, 

 more acutely rounded at the bottom, three times as wide as deep ; seventh 

 transversely truncate at tip, angles rounded. 



Female. — Unknown. 



Length 2.5 mm. 



San Mateo, California, 2. 



Distinguished from vestalis by its more robust form, fulvous pubes- 

 cence and much finer, closer and more channeled elytral sculpture. 



122. S. amicus n. sp. — Form moderately robust. Pubescence sparse, 

 coarse, short, nearly erect, plumbeous except a few scattered hairs on the 

 head, and clusters toward the middle and base of the abdomen, which are 

 fulvous. Head small, robust, less than twice as wide as long ; interocular 

 surface nearly three times as wide as the eye, rather feebly depressed ; longi- 

 tudinal elevation nearly as wide as the lateral portions, feebly and evenly 



