AMERICAN COLEOPTERA. 27 



A. molestns, n. sp.-Piceous, feebly shining, sparsely clothed with a 

 very fine pubescence. Head moderately densely and rather coarsely punc- 

 tured. Eyes feebly prominent. Antennae serrate, sparsely hairy, second joint 

 very small, third larger, the two together nearly equal to the fourth. Thorax 

 not longer than wide, sides distinctly margined, very feebly arcuate, gradually 

 divergent to base, hind angles very slightly more divergent and carinate sur- 

 face rather strongly convex, usually moderately densely punctured. Elytra 

 finely striate, intervals moderately densely scabro-punctate. Body beneath 

 more shining than above, moderately densely punctulate. Tarsi slender but 

 not longer than the tibiae. Length .48 inch ; 12 mm. 



The three specimens before me are probably all males. The last 

 ventral segment has a very feeble sinuation on each side. 



Collected by Mr. William M. Gabb, near San Francisco, California. 



]»IAL.A€HIUS, Fab. 

 M. macer, n. sp.-Form slender. Head black bronzed, smooth and shi- 

 ning, with slight frontal impression. Thorax slightly broader than lone 

 smooth, very shining, large irregular discal spot black, margins pale testaceous' 

 Elytra scarcely wider than the thorax, surface scabrous, moderately shinin- 

 black, slightly bronzed, with broad testaceous vitta extending from the 

 humerus to apex. Body beneath black, shining, legs pale testaceous, upper 

 margin of femora and last joint of tarsi black. Lehgth .12 inch ; 3 mm 



Male-Antenna black, pectinate, elytra slightly prolonged, and testaceous at 

 tip. 



Female.— Antennie serrate, elytra obtuse and testaceous at tip. 



Two specimens collected by Mr. G. R. Crotch, in the region of Lake 

 Tahoe, California. 



n. spinipennis, n. sp.— Form of auntus. Head smooth, shining black 

 front slightly impressed. Thorax broader than long, surface very smooth and 

 shining, black, lateral margins pale red. Elytra slightly broader at base than 

 thorax, surface feebly scabrous, bluish, moderatelv shining. Body beneath 

 black, shining, legs black with tinge of blue, hind" tibiae testaceous at apical 

 half. Length .18 inch ; 4.5 mm. 



J»/a/e.-Antennae black, joints 5—10 pectinate, joints .3, 4 triangular. Elytra 

 sinuate at apex, suture prolonged into a spiniform process and red, beneath 

 which are appendages of curious structure, one being spiniform and pro- 

 jecting backwards under the spiniform process of the suture and concealed bv 

 it from above. ^ 



Female. — Unknown. 



Collected by Mr. G. R. Crotch, at Fort Tejon and Sauta Barbara, 

 California. 



Two specimens, both males, are before me which differ from each 

 other as follows : the smaller has the antenna less decidedly pecti- 

 nate, the elytra more opaque and bronzed instead of blue, and the 

 discal black spots of thorax much smaller. 



This species is closely allied to mirandus, which, however, has the 

 elytral appendages very prominent and has not the suture prolonged, 

 although there is a small juxta-sutural appendage. 



