COLEOPTERA. 173 



just iii advance of the middle; punctures moderately impressed, rounded, 

 very close, somewhat confused. Elytra at base slightly wider than the head ; 

 sides very slightly divergent posteriorly, much longer than the width at base, 

 very feebly arcuate ; together broadly, roundly, and rather feebly emarginate 

 behind: suture nearly one-half longer than the pronotum : surface strongly 

 and somewhat unevenly punctate ; punctures round, rather deeply im- 

 pressed, somewhat close ; interspaces nearly fiat, minutely reticulated. 

 First four abdominal segments decreasing scarcely perceptibly in width, 

 first as wide as the contiguous elytra, sub-cylindrical ; border apparent on 

 the first only ; transverse carinae very obscurely cusped in the middle, where 

 they are more free from pubescence than laterally ; surface rather closely, 

 evenly, and very strongly punctulate ; punctures nearly as large as those of 

 the elytra. Legs short and rather slender, black, tarsi very dark piteous- 

 brown ; first three joints of the posterior almost uniformly decreasing in 

 length ; all the joints very densely pubescent beneath. 



Mule. — Unknown. 



/•', male. — Sixth ventral segment long, rather narrow, rapidly becoming 

 narrower posteriorly throughout its length, narrowly rounded at the tip, 

 surface having a broadly rounded, rather feeble canaliculation traversing 

 nearly its entire length ; seventh segment bilobed at tip. 



Length 5.0 mm. 



Alamosa, Colorado, 1. 



This species greatly resembles pollens, but differs specifically in the 

 structure of the palpi and sixth ventral segment, also most decidedly 

 in the stronger punctuation of the abdomen above and beneath. 



19. A. recomlitlis n. sp. — Form robust, slightly depressed. Pubes- 

 cence rather close, evenly distributed, semi-erect, short, cinereous, somewhat 

 conspicuous. Head rather small, robust, not twice as wide as long ; inter- 

 ocular surface slightly convex, slightly more than twice as wide as the eye; 

 sulfations broadly rounded, feeble ; intermediate surface evenly and mode- 

 rately convex, slightly wider than the lateral portions ; punctures small, 

 round, deeply impressed, evenly distributed and very close, separated gener- 

 ally by less than one-half their own widths ; ocular lines meeting at two 

 lengths in advance; antennae slightly longer than the width of head, rather 

 robust ; basal joint black, second joint and funicle pale testaceous, club 

 castaneous, large ; third joint one-half longer than the fourth, joints six, 

 seven, and eight decreasing in length, the latter more robust, joints of club 

 slightlv elongate, last two much larger than the ninth ; maxillary palpi 

 piceo-testaoeous, paler toward the base, infuscate toward the apex. Pro- 

 thorax arcuately, evenly, and very gradually increasing in width to a point 

 slightly behind the middle, where it is slightly narrower than long; sides 

 thence more rapidly convergent posteriorly and distinctly sinuate; posterior 

 margin slightly longer than the anterior, nearly straight, the latter very 

 feebly arcuate; surface feebly and distantly tuberculate at the base, other- 

 wise very evenly convex : punctures very fine, deep, round, close, and evenly 

 distributed ; interspaces one-third as wide as the punctures, acutely convex, 



