NORTH AMERICAN COLEOPTERA. 51 



like, and has a brassy lustre ; a stripe extending from humerus to posterior callus 

 and some scattered spots on disc aud convexity of grayish white scales. Under- 

 side semiglabrous, pectus rather densely clothed with gray .scales. Legs rufo- 

 piceous, femora iufuscate at middle. Length 3.75-4 mm. ; .15-. 16 inch. 



S . Apical half of last ventral impressed, emarginate. 

 9 . Last ventral with a large, subquadrate fovea, not emarginate. 

 Hab. — California, Washington Territory (Dr. Horn), Oregon 

 (UlkeJ. A very distinct species. 



M. aiitliraoiiins n. sp. — Oblong, shining black, very sparsely pubescent. 

 Antennse and feet rufous; rostrum stout, subquadrate, almost as long as the 

 thorax, strongly tricarinate ; apex a trifle wider than at base. Surface coar.sely 

 rugosepuuctate, each puncture bearing a short hair, transverse basal impre.ssion 

 profound, with a strongly marked central fovea ; antenual grooves sharply 

 pointed, very much expanded posteriorly and attaining the anterior margin of 

 the eye in almost its whole extent. Head subconvex, a trifle narrower between 

 the eyes than rostrum at base, coarsely punctured and very sparsely pubescent. 

 Thorax one-balf wider than long, convex, scarcely wider at base than at apex ; 

 sides almost straight and slightly divergent for three-fourths their length, rather 

 suddenly rounded to and broadly constricted at tip. Surface very coarsely 

 punctate, sides and along anterior margin more densely and less coarsely ; ob- 

 liquely indented each side in front, indentation reaching the median line; pu- 

 bescence fine, scale like, a curved lateral line and an antescutellar spot of white 

 scales ; median carina strongly marked, commencing behind anterior margin 

 and extending about two-thirds the length of thorax, becoming slightly broader 

 and more elevated posteriorly ; lobes very prominent. Elytra one-half wider 

 than thorax at base; sides subparallel for two-thirds rather rapidly narrowed to 

 and rounded at tip, latter not compressed. Strife more strongly impressed on 

 the convexity, punctures large, transverse and closely set ; a distinct transverse 

 indentation near the base extending from second to fourth interstice; inter 

 spaces slightly convex, finely punctulate ; setse slender, more evident along the 

 convexity, latter more strongly pronounced than usual; posterior callus small, 

 but distinct; pubescence very fine, sparse; a few irregular, ill defined spots of 

 pale, inconspicuous scales. Underside shining, sparsely punctured aud pubes- 

 cent, except on the thorax. Legs shining, sparsely pubescent. Length 3.5-4 

 mm. ; .14-. 16 inch. 



Easily recognized by its black, shining appearance and coarse 

 sculpture. 



The last ventral segment is broadly impressed in both sexes. 

 Hah. — Florida. Dr. Horn's and Mr. Ulkes collections. 



M. porcellus Say. — Similar in form and appearance to humUis, but smaller, 

 pitchy black, shining, thinly pubescent, Antennje bright rufous; beak rather 

 slender, almost as long as the thorax, tricarinate, rugulose-punctate, thinly 

 clothed with not very fine, grayish pubescence ; basal impression feeble ; antenual 

 grooves sharply pointed in their whole extent and less expanded toward their 

 distal extremity, scape of anteunte impinging against upper part of eye. Head 

 convex, slightly wider than rostrum at base, densely punctulate and finely pu- 



