Coleopterological Notices. ' 465 



Male. — Anterior tarsi rather feebly but distinctly dilated and somewhat 

 densely clothed beneath with coarse spongy-pubescence ; intermediate robust 

 but not appreciably dilated, simply coarsely spinose beneath without trace 

 of pubescence ; abdomen feebly and rather narrowly impressed in the middle 

 toward base. 



Length 5.5-5.8 mm. ; width 1.9-2.1 mm. 



Southern California ; Arizona (Yuma). 



The lemale does not differ greatly from the male. I have before 

 me a male example which is entirely rufo-ferruginous in color and 

 rather more robust, in which the anterior tarsi are scarcely percep- 

 tibly dilated and clothed beneath with long coarse spines without 

 trace of squamules; the abdomen being broadly and feebly impressed 

 in the middle toward base, shows that there can be no mistake 

 regarding the sex of this specimen, which represents therefore a 

 closely allied species which should not be named at present, for 

 Avithout additional specimens I am unable to state whether or not 

 the peculiar pale color is due to immaturity. 



M. tenuis n. sp. — Slender, parallel, depressed, piceous-black ; head and 

 protliorax very slightly paler, rufo-piceous ; integuments shining ; pubescence 

 nearly as in angustus. Head feebly transverse, slightly convex, rather finely 

 and sparsely punctate ; epistoma broadly and very feebly sinuate ; upper lobes 

 of eyes moderate, rather convex ; antennse slender, feebly incrassate toward 

 tip, fully as long as the head and prothorax, third joint slender but very dis- 

 tinctly shorter than the next two combined, tenth as wide as long. Prothorax 

 scarcely more than one-third wider than the head, one-third wider than long ; 

 base distinctly narrower than the apex, the former transversely truncate, the 

 latter nearly so, being but just perceptibly incurvate ; basal angles obtuse, 

 not rounded ; sides moderately strongly arcuate ; disk widest slightly before 

 the middle, rather finely and very sjmrsely punctate, the punctures toward the 

 sides separated by fully twice their own widths. Scutellum well developed, 

 nearly as in angustus. Elytra parallel, very slightly wider than the prothorax 

 and about three times as long, at base wider than the base of the pronotum, 

 evenly rounded at apex ; humeri rounded ; sides slightly and evenly arcuate ; 

 disk coarsely but feebly striate, the striae coarsely, deeply and not very ap- 

 proximately punctured ; intervals nearly flat, from three to four times as wide 

 as the strial punctures, very finely, sparsely and irregularly punctate. Abdo- 

 men coarsely, not very sparsely punctate. 



Afale. — Anterior tarsi very feebly dilated, spinose beneath, without trace of 

 pubescence ; intermediate not dilated ; abdomen broadly, very distinctly im- 

 pressed in the middle toward base. 



Length 4.8 mm. ; width 1.6-1.8 mm. 



Southern California. 



This species is allied to angustus, but dififers in its smaller size, 



