158 Trans. Acad. Sci. of St. Louis. 



15 — Elytra closely punctured; punctures toward the sides of the prouotum 



closer and more distinct 16 



Elytra sparsely and less strongly punctate, the pronotura finely, very 

 sparsely and sometimes barely perceptibly punctate 19 



16 — Abdomen extremely densely punctured and opaque. Body small in size, 



Blender, black, the elytra plceous-black, rufescent along the apical 

 margin, more broadly toward the sulure; legs dark rufo-piceous, the 

 antennae black, picescent toward base; head relatively well developed, 

 three-fifths as wide as the prothorax; antennae rather strongly incras- 

 sate distally, as long as the head and prothorax, the second and third 

 joints elongate, equal, the tenth fully twice as wide as long, the eleventh 

 large, obtusely conoidal, distinctly longer than the two preceding 

 combined; prothorax one-half wider than long, not wider than the 

 base of the elytra, the punctures toward the sides unusually sparse and 

 feeble in the present group; elytra transverse, somewhat wider loan 

 the prothorax, the sides slightly longer than the sides of the latter, the 

 suture three-fourths as long as the median line, the punctures s,mall, 

 asperate and close-set but much less dense than those of the abdomen, 

 the latter at base not quite as wide as the elytra; mesosternal process 

 squarely truncate at tip, the latter only tangentially attaining the broadly, 

 evenly parabolic metasternal process and with the angles right and only 

 very narrowly rounded; hind tarsi distinctly shorter than the tibiae, 

 the basal joint equal in length to the next two combined. Length 3.3 

 mm.; width 0.73 mm. New Mexico (Las Vegas), Arizona and Cali- 

 fornia (Humboldt Co.) densiventris u. sp. 



Abdomen very closely and strongly punctured, the punctures similar to those 

 of the preceding species but narrowly separated, the interspaces pol- 

 ished 1 ^ 



17 — Antennae unusually short, rather strongly incrassate distally, extend- 



ing scarcely beyond the middle of the prothorax, the second and the 

 third joints short, stout and equal, each much less than twice as long as 

 wide in the female but longer in the male, feebly obconical, the fourth 

 distinctly transverse, the tenth about twice as wide as long, the eleventh 

 still broader, very obtusely conoidal, longer than the two preceding 

 combined. Body small, rather stout, polished, piceous-black, the elytra 

 rufo-piceous with the region toward the suture nubiiously more flavate, 

 except near the base, the abdomen deep black; head rather more than 

 half as wide as the prothorax, the latter larger than in the preceding, 

 less than one- half wider than long, the punctures laterally moderately 

 distinct, the usual large discal puncture at each side con.«picuou9 ; 

 elytra slightly wider than the prothorax, the sides somewhat longer 

 than the sides of the latter, the suture two-thirds as long as the median 

 line; abdomen subequal in width to the elytra, parallel; basal joint of 

 the hind tarsi rather short, three-fourths as long as the fifth and much 

 shorter than the next two combined. Length 3.2 mm. ; width 0.86 mm. 

 California (Monterey Co.) obsolescens n. sp. 



Antennae having the second and third joints much more elongate, the former 

 somewhat the shorter of the two 18 



j8 Basal joint of the hind tarsi unusually short, three-fourths as long as 



the last, the first three joints decreasing uniformly in length. Body 



