688 Coleopterological Notices, IV. 



eyes, much more abbreviated, dilated and semi-corneous antennal 

 club, deflexed beak, short legs, and smaller size of the body. The 

 three species before me may be easily separated as follows : — 



Piceoiis-brown, the punctuation of the upper surface finer and more remote. 



Body narrowly cylindrical, the elytra more tlian twice as long as wide ; 



punctures of the elytral series becoming very fine and feeble in apical 



half, the fifth and sixth series coalescent at base; humeri tumid and 



prominent frontalis 



Body much more robust, the elytra not quite twice as long as wide ; punc- 

 tures of the elytral series deep throughout, although small in apical half 

 as usual ; fifth and sixth series widely separated at base ; humeri not 



tumid sliarpi 



Black, much larger, coarsely and deeply sculptured ; legs and tarsi stouter. 



grossus 



Y. frontalis Lee. — Trans. Am. Ent. Soc, 1874, p. 70 (Rhina). 



Readily distinguishable by its slender cylindrical form and eas- 

 taneous color. The prothorax is very nearly as long as wide, the 

 sides broadly, evenly arcuate, the apex finely and deeply constricted, 

 three-fourths as wide as the base, the latter broadly evenly and just 

 visibly arcuate. Elytra but slightly wider than the prothorax and 

 much more than twice as long, strongly alutaeeous especially be- 

 hind, the series feebly impressed, the intervals toward base three 

 to four times as wide as the strial punctures, sparsely punctured. 

 Length 9.8 mm. ; width 3.2 mm. 



Southern California. Found under the bark of Yucca in the 

 Mohave Desert. 



Y. sliai'pi n. sp. — Moderately stout, cylindrically convex, dark chestnut- 

 brown, polished and glabrous throughout, the elytra but faintly alutaeeous 

 behind. Head convex, polished, strongly but remotely punctate ; eyes very 

 remote above, contiguous beneath ; beak in the male straight, wider than 

 thick, parallel, coarsely deeply and rugosely punctate, feebly dilated at the 

 antennie, barely three-fourths as long as tlie prothorax ; antennfe inserted 

 just beyond the middle, the scape thick, attaining the eye, second funicular 

 joint longer than the first and as long as the next two, club oval, compressed, 

 as long as the four preceding joints, the polished corneous part extending, on 

 the flat side, to apical third. Prothorax about as long as wide ; sides evenly, 

 broadly arcuate ; apex finely constricted, three-fourths as wide as the base ; 

 punctures coarse, perforate, remote, close on the flanks. Scutellum small, 

 polished. Elytra one-third wider than the prothorax, more than twice as 

 long, the punctured series strongly impressed toward base ; interstitial 

 punctures remote, confused but forming nearly even single series on the 

 narrower intervals. Length 9.7 mm. ; width 3.7 mm. 



