580 Coleopterological Notices, V. 



as wide, second but slightly wider and a little shorter than the third, remain- 

 ing joints equal in width, feebly subserrate, slightly smaller and closer toward 

 apex; maxillary palpi well developed, the last joint subsecuriform, rounded 

 at apex, deeply canaliculate along the under surface at the cariniform outer 

 edge throughout the length. Prothorax twice as wide as long, the apex fully 

 two-thirds as wide as the base, the latter broadly, strongly bisinuate ; disk 

 widest at the basal angles, convex toward the middle, the lateral edges nar- 

 rowly reflexed. Scutellum a little wider than long, opaque, impressed. Elytra 

 one- third longer than wide, broadly rounded behind, dehiscent at apex, broadly 

 impressed in the middle, and obliquely from the humeri, to beyond the middle, 

 with feeble traces of impressed lines. Legs rather short ; femora stout ; tibiae 

 finely carinate externally ; tarsi slender, glabrous ; claws moderate, strongly 

 arcuate, with an internal dentiform swelling near the base. Length 3.8-4.8 

 mm. ; width 2.0- '. 7 mm. 



California (Mendocino Co.). 



I obtained a small colony of this species, almost motionless on 

 the under surface of a stone near a running brook. The descrip- 

 tion is drawn from the male, the female being larger, with the pro- 

 notum dense and opaque velvety-black, the maxillary palpi much 

 less developed, the last joint being small, obliquely oval, with the 

 apex glabrous and polished, and the abdomen having only six seg- 

 ments. The shape of the prothorax is altogether different from 

 that of f alii, and the sexual differences in the palpi are remarkable, 

 though probably more or less similar throughout the genus. 



LVTROCHUS Erichs. 



Our two species, both of which have long been known in collec- 

 tions, may be distinguished as follows: — 



Smaller, less elongate, the vestiture yellowish. Head small, not more than 

 one-half as wide as the thoracic base. Sides of the prothorax more conver- 

 gent from base to apex. Scutellum smaller, but slightly wider than long. 



luteiis Lee. 



More elongate-oval, the elytra acute and slightly prominent at apex ; pubes- 

 cence darker. Head large, fully two-thirds as wide as the thoracic base. 

 Prothorax much more than twice as wide as long, the apex only slightly 

 narrower than the base ; sides just visibly convergent from base to apex, 

 slightly arcuate; disk broadly convex. Scutellum one-half wider than 

 long, broadly ogival behind, very broadly arcuate at base. Remaining 

 characters nearly as in luteus. Length 2.9-3.6 mm.; width 1.6-2.0 mm. 

 Michigan laticeps n. sp. 



Laticeps is represented by a large series ; it is closely allied to 

 luteus but must be regarded as distinct. 



