402 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



into a transverse fascia and with the other elytral spots faint or 

 obsolete, resemble signatus quite strongly, and, in the material 

 before me, a Stockton, Utah, example bears the name signatus 

 in Bowditch's handwriting. Most of the examples of this form 

 are from the arid regions of the Great Basin, and there is little 

 doubt that the Provo, Utah, specimens provisionally referred 

 to signatus by Bowditch belong here. These are separable from 

 the true signatus by their paler whitish yellow color, and in pos- 

 sessing the somewhat less prominent eyes and a little larger 

 anterior male claws, as in other 7nelanostictus. Bowditch de- 

 scribes signatus as shining; some specimens are somewhat so, 

 but all show a very distinct alutaceous sculpture throughout. 

 84. Pachybrachys postfasciatus new species 



Dull yellow, scarcely at all shining, thickly and for the most 

 part confusedly l^rown punctate, the elytra with some more or 

 less fragmentary striae, not or feebly impressed towards the 

 rear and sides; standard spots very diffuse, the posterior ones 

 coalescing to form a more or less distinct fascia on the elytra) 

 declivity; eyes distant, ocular lines present but sometimes verj^ 

 faint or subobsolete; front claws of male evidently enlarged. 

 Ave. length 2.7 mm. Texas, Kansas, Arizona. 



Head closely punctate above the antennal insertion, sparsely so in front, 

 markings very vague and diffuse; eyes separated in the male by two to two and 

 one-fourth times the length of the basal antennal joint, and in the female by 

 about three times the length of the basal joint. Antennae moderate, dull 

 yellow, basal joint in part, and outer joints more or less brownish; tenth about 

 two and one-fourth times as long as wide in the male; in the female the an- 

 tennae do not pass the middle of the body, the tenth joint relatively slightly 

 shorter. 



Proihorax moderately transverse, not much narrowed in front, especially. in 

 the male, sides broadly arcuate, slightly rounded in at the base; pimctuation 

 rather close but somewhat uneven, sparse along the side margins, markings 

 very diffuse. 



Elytra confusedly and thickly jninctate in a broad baso-sutural triangle, 

 exterior to this the punctures are less close and show a tendency to form short 

 and imperfect or irregular striae; submarginal stria usually much confused in 

 the female, but better defined in the male; marginal interspace punctured; 

 shield small, often scarcely detectable. 



Pi/f/idiuni. brown with small yellow sjiots. Body beneath brown, last ven- 

 tral segment with or without a lateral pale spot. Femora yellow with broad 

 brown rings, tibiae brown. 



Length 2.5 to 2.9 mm.; widtli 1.35 to 1.7 mm. 



