120 Trans. Acad. Sci. of St. Louis. 



northern Asia and Europe ; it descends along the mountains 

 in America as far south as Colorado. It is not at all closely 

 related to Lathroiaxis, which follows, although classified 

 under the same head in the table on account of the form of 

 the gular sutures, but, as before stated, belongs with Lathro- 

 tropis and Eulathrobium. The few species thus far brought to 

 light within our territories may be briefly described as fol- 

 lows : — 



Body broader and stouter, the prothorax but slightly elongate; pale rufo- 

 testaceous throughout, the antennae and abdomen dusky; head large, 

 fully as wide as long, parallel and nearly straight at the sides, the 

 base broadly arcuato-truncate, the angles moderately broadly rounded; 

 eyes moderate, the punctures rather small and close-set, sparse on the 

 vertex; antennae but little longer than the head and prothorax, rather 

 slender, the medial joints decidedly longer than the subapical and fully 

 twice as long as wide; prothorax distinctly narrower than the head, 

 widest anteriorly, the sides distinctly converging to the base and 

 nearly straight, a fourth or tifth longer than wide, the anterior angles 

 moderately broadly rounded, the punctures rather small but deep, 

 irregular, close-set near the subelevated median line, the latter nar- 

 rowly impressed behind the middle for a short distance; elytra slightly 

 elongate, as wide as the head, subparallel with the sides feebly arcuate, 

 scarcely longer than the prothorax and about a fourth wider, coarsely, 

 very closely and sublinearly punctate; abdomen parallel, about as wide 

 as the elytra, finely, closely punctate. Male with ventrals two to five 

 strongly, not very broadly impressed along the median line throuuhout, 

 the fifth with a broadly rounded shallow sinus as wide as the attend- 

 ant impression ; sixth broadly impressed throughout in median third in 

 continuation of the preceding impressions, the apex with a narrower 

 and abruptly formed sinus nearly as deep as wide and widely rounded 

 at the bottom; impression anteriorly with a large patch of short 

 black spiculiform hairs narrowly divided along the middle; female 

 unknown. Length 7.0 mm.; width 1.1 mm. Washington State (Thurs- 

 ton Co.; tacoinae n. sp. 



Body narrow and slender, the prothorax narrow and notably elongate; 

 medial joints of the antennae about equal in length to the subapical and 

 much less than twice as long as wide 2 



2 — Sides of the prothorax feebly converging from apex to base, broadly 

 and almost evenly arcuate throughout; dark fusco-testaceous, the 

 elytra fiavo-testaceous, gradually blackish-piceous in basal half; ab- 

 domen piceous-black, the legs dark ferruginous, the antennae dusky, 

 longer than the head and protbcirax, rather stout, feebly incrassate dis- 

 tally; head rather longer than wide, parallel and broadly arcuate at the 

 sides, the base broadly arcuato-truncate, somewhat wider than the ely- 

 tra, with the basal angles moderately broadly rounded, the punctures 

 rather fine but deep and close-set toward the sides and base; prothorax 

 much narrower than the head, a third longer than wide, the apical angles 



