THE CANADIAN ENTOMOLOGIST. 315 



tibiae clothed with short decumbent hairs, with some small inclined 



spinules intermingled externally ; terminal spurs small, slender ; tarsi 

 long, filiform ; basal joint of the posterior as long as the entire remainder, 

 the penultimate simple ; claws well developed, feebly subdentate within 

 near the base. 



This genus differs from Mastoronus in the structure of the eyes, 

 tempora, maxillary palpi, tarsi and vestiture of the entire body and legs, 

 as may readily be observed on comparing the descriptions. The genus 

 does not closely resemble Bactrocerus, Lee, under which name specimens 

 were distributed by Mr. Wickham, the latter genus having the eyes much 

 smaller, with the tempora rather long, but strongly converging behind 

 them to the neck, which is very much narrower. The prothorax in 

 Bactrocerus is transverse, gradually narrowed from near the apex to 

 the base, the surface clothed sparsely with long erect hairs, not at all 

 concealing the sculpture, which consists of lunate granuliform elevations 

 having their concavities outward. The antennse are not serrate, and the 

 last joint is as long as the four preceding combined. Bactrocerus 

 coucolor, from Lower California, is 7.0 x 2.0 mm. in size. The vestiture 

 is long and sparse throughout, shorter and less erect on the elytra. Of 

 Leptoremus I have seen only the type species, which may b^described as 

 follows : 



Z. argenteus, n. sp. — Moderately slender, convex, black, the legs 

 scarcely paler, the antennae red-brown, densely, not very coarselv, roughly 

 punctured, the surface in great part concealed by dense and closely 

 decumbent silvery-white hairs, short or moderate in length and rather 

 coarse, without trace of erect hairs at any point ; head less than two- 

 thirds as wide as the elytra, the eyes separated anteriorly by very much 

 less than their own width, their inner outline obliquely rounded, the 

 tempora behind them extremely short and subtransversely rounded to the 

 neck, with the margin adjoining the eyes somewhat prominent ; antennae 

 rather more than three-fourths as long as the body, rather broad and 

 strongly compressed basally, the second joint very small and transverse, 

 the first moderate, three to five similar and having the form of a right- 

 angled triangle, less than twice as long as wide, seventh to ninth more 

 than twice as long as wide, less serrate and gradually longer, tenth fully 

 three times as long as wide ; prothorax distinctly narrower than the head, 

 and evidently longer than wide, subparallel, the sides broadly rounded 

 anteriorly, the base two-fifths wider than the apex before the constriction • 



