246 CALIFORNIA ACADEMY OF SCIENCES. 



which are, however, quite surely the same thing, have 

 the tips very narrowly yellow. These latter resemble 

 M. mixius quite closely, but this latter species has the 

 elytra non-appendiculate in the male. 



60. Malachius nigrinus, sp. no v. 



Slender, shining, black, without evident metallic lustre, the mouth, 

 labrum, and epistoma, under side of the first three antennal joints, and a 

 very narrow margin at the hind angles of the prothorax, yellow. Surface 

 very finely, sparsely punctulate, with short sparse pale pubescence, and a 

 few longer, erect dark hairs. Antennfe slightly passing the middle of the 

 elytra and moderately pectinate in the male; scarcely reaching the middle 

 of the elytra, and rather strongly serrate in the female. Head with a 

 small median and the usual lateral impressions. Prothorax transverse; 

 when viewed from above, the apex is nearly truncate, the sides nearly 

 straight and parallel for a short distance, then broadly rounding into the 

 base, which is rather strongly arcuate. Elytra parallel or nearly so in 

 both sexes, the apices not appendiculate in the male, but separately 

 rounded and not evidently produced in either sex. 



Length, 3-.3.2 mm. 



Taken in the Sierras near San Bernardino and at 

 Lake Tahoe. 



There is no variation in the eight examples seen. 

 The small size, narrow form, and almost entirely black 

 color may be relied upon to distinguish this species 

 from all others having the antennse of the male pecti- 

 nate, and the elytra non-appendiculate. The length of 

 the antennal branches is approximately equal to the 

 diameter of the eye as seen from the front. 



61. Malachius prolixicornis, sp. no v. 



Slender, black, feebly bronzed, surface shining throughout; prothorax 

 very narrowly margined with yellow except (in some specimens) for a 

 short distance at the middle of the apex; mouth-parts, labrum and ep- 

 istoma yellow; antennfe more or less pale toward the base; legs pale, 

 femora clouded except at base. Antennae in the male strongly pectinate 

 from the fifth joint, reaching or even passing the tips of the elytra; in 



