278 MEMOIRS ON THE COLEOPTERA 



slightly at apex; punctures small but deep and strong, rather sparse, 

 becoming more condensed toward base, the external impression about 

 the smooth humeral spot very vague and feeble; dorsal striae wholly 

 wanting; pygidium finely but strongly, loosely punctate, the propygidium 

 rather the more closely; prosternum sparsely punctate, with two feeble 

 parallel discal lines extending about three-fourths from the emarginate 

 base, the surface between them impressed at base, the lateral straight, 

 feebly diverging lines distinct; mesosternal projection acute; anterior 

 tibiae with four sharp external spinules in less than apical half, the 

 intermediate with three larger and more widely spaced denticles, the 

 posterior with about four slender spines apically. Length 1.65-1.9 mm.; 

 width 0.7-0.9 mm. California (San Francisco). 



Two examples were taken by the writer many years ago in the 

 suburban districts; the species differs from levatus described from 

 Cape San Lucas, but of which I have a seemingly typical, though 

 smaller, example collected by Wickham at Yuma, California in 

 its much more slender form and absence of the oblique basal stria 

 of the elytra. 



Teretrius minutus n. sp. Oblong, cylindric, rather stout, shining, 

 piceous, paler beneath; head evenly convex and finely, closely punctate 

 throughout; prothorax a third wider than long, the parallel sides rounding 

 strongly at apex, broadly sinuate viewed laterally and not prominent 

 near basal third, the stria gradually arcuate inward basally; surface 

 very finely, strongly, closely punctate, gradually rather less finely, more 

 sparsely posteriorly; elytra slightly longer than wide and two-fifths 

 longer than the prothorax, finely, evenly and rather sparsely punctate, 

 the punctures slightly closer along the base, the humeral umbo small, 

 smooth and at a long distance from the base, the impression before it 

 broad and very feeble; discal striae wanting; pygidium strongly convex, 

 finely and rather sparsely punctate; prosternum coarsely punctate, 

 broadly convex, not medially striate but canaliculate basally, slightly 

 elongate between the lateral feebly diverging lines; mesosternal pro- 

 jection strong, acutely triangular with blunt apex; anterior tibiae with 

 about five small external spinules. Length 1.35 mm.; width 0.7 mm. 

 A single specimen, doubtful as to locality, but probably from the northern 

 Atlantic States. 



This species is notable on account of its very small size, rather 

 robust form somewhat as in most of the genus Teretriosoma and 

 other characters as stated. 



Plegaderus Erichs. 



The numerous very small species constituting this genus are 

 remarkably homogeneous among themselves after eliminating Eu- 

 brachium Woll., founded upon the Ulster pusillus of Rossi, which 



