14 CALIFORXIA ACADEMY OF SCIENCES. 



sexual characters being merely a slight emargination at the 

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

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

 founded with anv other here described: it is the smallest of 

 this group of genera which has been thus far discovered. 



LITH0CHARI5 Lacord. 

 Group A. 



We have here another group, of four species, remarkably 

 distinct from either of the ])receding. 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 eyes, 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 a]jex to base, and are some- 

 times feebly sinuate in the middle. 



10 — L. sinuatOCOllis u- =P- — Form rather sleuder; elytra and abdomen dark 

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

 testaceons; anteome dark fuscous, paler at the apex; leg-; rather pale ferni- 

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

 longer than -n-ide, broadly sinuate at base, angles rather broadly rounded; 

 sides long, very feebly convergent anteriorly and distinctly arcnate; epi:-toma 

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

 ately convex, rather tinely and densely punctate, very feebly alutaceous; 

 puncriires feebly impressed, distant by neaily t^^ice their own widths; median 

 impnnctate ai-ea rather uaiTow; eyes very small at nearly four times their 

 own leugh from the bas-: anteun;t sleuder, 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 slightly wider than long. Pro- 

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

 convergent posteriorly throughout and feebly sinuate in the middle; base 

 broadly 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, modeiate in width. Elytra at base very slightly naiTower than 



