14 CALIFORNIA ACADEMY OF SCIENCES. 



sexual characters being merely a slight emargination at the 

 apex of the sixth segment, slightly wider than deep and not 

 at all rounded, triangular. This species cannot be con- 

 founded with any other liere described; it is the smallest of 

 this group of genera which has been thus far discovered. 



LITHOCHARIS Lacord. 



Group A. 



We have here another group, of four species, remarkably 

 distinct from either of the preceding. The size is larger 

 than in any of the other genera, and the large, sub-triangu- 

 lar, very finely and densely punctate heads with their very 

 minute ej^es, give them a very peculiar appearance which 

 renders them immediately recognizable. The elytra are 

 short, sometimes equal in length to the prothorax and never 

 very much longer. The sides of the prothorax are usually 

 very distinctly convergent from apex to base, and are some- 

 times feebly sinuate in the middle. 



10 — L. sinuatOCOllis n. sp.— Form rather slender; elytra and abdomen dark 

 fuscous, the latter paler at tip; head and pronotum slightly paler, dark rufo- 

 testaceous; autenn;t) dark fuscous, paler at the apex; legs rather pale ferru- 

 ginous throughout; pubescence rather sparse. Head rather large, much 

 longer than wide, broadly sinuate at base, angles rather broadlj^ rounded; 

 sides long, very feebly convergent anteriorly and distinctly arcuate; epistoma 

 very broad, moderately produced, apex truncate; surface broadly and moder- 

 ately convex, rather finelj'" and densely punctate, very feebly alutaceous; 

 punctures feebly impressed, distant by neaily twice their own widths; median 

 impunctate area rather narrow; eyes very small at nearly four times their 

 own length from the basb; antenn?B slender, much shorter than the head and 

 prothorax together; basal joint as long as the next two together, second and 

 third sub-equal in length, the former slightly more robust and much more 

 oval, distinctly longer than the fourth, tenth slightl}^ wider than long. Pro- 

 thorax quadrate, very slightly narrower than the head; sides rather strongly 

 convergent posteriori}' throughout and feebly sinuate in the middle; base 

 broadl}' truncate in the middle, arcuate at the sides; apex broadly arcuate, 

 feebly and roundly emarginate in the middle third; anterior angles rather 

 broadly rounded, basal slightly more broadly so; disk moderately convex, 

 finely, rather feebly and sparsely punctate; median line equal throughout 

 the length, moderate in width. Elytra at base very slightly narrower than 



