AMERICAN COLEOPTERA. 143 



Middle claws pectinate along a double margin. Posterior claws finely serru- 

 late along a double margin. Posterior tibiae fimbriate with long hairs within, 

 spurs slender, the outer one-fourth longer. Posterior tarsi about as long as the 

 tibise, stout, densely clothed with moderately long pubescence beneath. 



Female. — Club of antennte shorter than the funicle. Tarsal claws similar on 

 all the feet, each claw with a strong acute tooth at middle, basal portion dis- 

 tinctly serrulate, apical portion with two or three fine serrations. In addition 

 on the inner side of each claw is a distinct second edge very finely serrulate. 

 Abdomen convex, smooth, terminal segment when normally in position shorter 

 than the preceding. Pygidium nearly as long as wide, moderately transversely 

 impressed at apical third, the space posterior to the impression coarsely punc- 

 tured, that anterior sparsely punctured, marginal groove moderately deep, 

 margin at sides distinctly reflexed. Hind tarsi slender, a little longer than in 

 the male and nearly as long as the tibise, the latter sparsely fimbriate within, 

 the spurs slender, slightly arcuate, the outer somewhat larger. 



This species has the most remarkable male characters of any in the 

 genus and may thereby be at once known. The female from the table 

 may be difficult to distinguish from that of disparilis, which is how- 

 ever a larger species, of darker color and more nearly superficially 

 resembling Lachnos. fasca. 



The male has but one tibial ridge while the female has distinct 

 traces of a second. 



Occurs in Arizona. 



L.. deusicollis Lee. Few Species, 1863, p. 77.— Subcylindrical, moder- 

 ately elongate, piceo-rufous, surface distinctly pruinose. Head opaque, densely 

 and coarsely punctured, front broadly and moderately deeply impressed above 

 the suture, clypeus transverse, angles broadly rounded, anteriorly subtruncate, 

 margin very feebly reflexed. Thorax one-half wider than long, narrower 

 at apex than base, sides obtusely subangulate, margin feebly fimbriate and 

 obsoletely crenulate, disc moderately convex, coarsely and deeply punctured, 

 punctures dense at apex but somewhat sparser at base. Elytra moderately 

 punctate, sutural and one discal costa feebly elevated. Length .62 inch; 

 15.6 mm. 



Mate. — Unknown. 



Female. — Club of antennae shorter than the funicle. Abdomen convex, 

 punctulate, the last segment more densely and coarsely and nearly as long 

 as the preceding. Pygidium sparsely punctate, feebly convex, and with a 

 distinct gibbosity near the apex, apical margin slightly prolonged. Claws 

 similar on all the tarsi, each with a moderately strong acute tooth near the tip 

 and strongly pectinate at base. Hind tibiae with slender, rather long spurs, 

 tarsi as long as the tibia. 



The pubescence is so removed from the entire surface of the unique 

 before me that \ cannot mention concerning it. There may be no 

 difterence in this respect between the present species and mucoreus. 

 It is probable that the male characters in the claws do not differ 

 greatly from that species. 



