170 Trans. Acad. Sci. of St. Louis. 



than at the eyes; prothorax obviously narrower than the head, dis- 

 tinctly and rather strongly obtrapezoidal, somewhat wider than long, 

 the sides nearly straight and the angles moderately broadly rounded; 

 elytra scarcely wider and but little longer than the head, not quite as 

 long as wide, a fifth wider and one-third longer than the prothorax; 

 body moderately stout, piceous-black, prothorax slightly paler, the 

 elytra and legs rufous, the head rather densely punctate, the pronotum 

 more sparsely and shining. Sinus of the fifth segment unusually 

 narrow, but little more than half as wide as the apex and shallow, the 

 process unusually wide and large, three-fourths as wide as the sinus, 

 broadly sinuate in its median three-fourths in circular arc; fimbriate 

 sides of the segmental sinus very short, strongly curved and with 

 about five spinules. Length 3.8 mm.; width 0.8 mm. California 

 (locality unrecorded) difforme n. sp. 



12 — Process slightly more than one-third the total width of the sinus, its 

 sides diverging at an angle of 45° to the base, its sides at apex broadly 

 rounded, its median sinus feeble in circular arc, broadly toward the 

 middle; fimbriate sides or the principal sinus broadly, evenly and 

 feebly curved; surface of the fifth segment not flattened. Body mod- 

 erately slender, piceous-black, rather shining, finely and not closely 

 punctate anteriorly, the prothorax slightly, the elytra and legs dis- 

 tinctly, paler; head rather small and narrow, as long as wide, the 

 basal angles very broadly rounded, the sides thence to the well devel- 

 oped eyes straight and parallel; prothoi'ax well developed, fully as 

 wide as the head, parallel and straight at the sides, a little wider than 

 long; elytra scarcely as long as wide, rather more than a fourth wider 

 and fully one-third longer than the prothorax; gular sutures gradually 

 becoming very approximate posteriorly, slightly impressed. Length 

 4.0 mm.; width 0.8 mm. California (Mendocino and Sta. Cruz Cos.). 



retrusDinCsy. 



Process much wider, broadly arcuate throughout or becoming slightly 

 truncate toward the middle, never distinctly sinuate 13 



13 — Body less slender, piceo-rufous, the head darker and the abdomen 

 black; head as wide as loug, parallel and straight at the sides behind 

 the eyes with the basal angles rounded, not evidently wider than the 

 prothorax, the latter distinctly wider than long, parallel at the sides 

 with rounded angles; elytra quadrate, much wider and longer than the 

 prothorax. Process in the sinus of the fifth segment broadly, evenly 

 arcuate throughout its width and fully half as wide as the sinus. 

 Length 4.0 mm. ; width 0.85 mm. California (Napa Co.) .sublestnm Csy. 



Body slender, piceous, the prothorax and flanks of the elytra nubilously 

 pale, the legs very pale; surface shining anteriorly; head rather wider 

 than long, parallel and straight at the sides, distinctly wider than the 

 prothorax, the basal angles rounded ; prothorax straight and parallel at 

 the sides, fully as long as wide, with broadly rounded angles; elytra 

 rather longer than wide, nearly one-half wider than the prothorax and 

 three-fifths longer; gular sutures quite distinctly, though narrowly, 

 separated i parallel, except anteriorly, where they become rather ab- 

 ruptly divergent. Process of the fifth ventral very large, three-fifths 

 as wide as the sinus, broadly arcuate throughout its width and becom- 



