146 GEO. H. HORN, M. D. 



females the discovery of a corresponding male may give some other 

 characters. 



Occurs in Utah, Arizona and New Mexico. 



li. sociatus n. sp. — Oblong ovate, reddish -brown, very faintly pruinose. 

 Head slightly convex, densely eribrate punctate, clypeus transverse, feebly 

 subtruncate, angles broadly rounded, margin very narrowly reflexed. Thorax 

 one-half wider than long, slightly narrower at base than apex, sides obtusely 

 subangulate behind the middle, margin strongly crenulate from apex to base 

 and fimbriate with moderately long hair, disc moderately convex, coarsely and 

 moderately deeply punctured, punctures denser in front along the margin. 

 Elytra coarsely and sparsely but not deeply punctured, sutural costa feebly 

 elevated, surface not pubescent. Body beneath clothed with long white hairs, 

 abdomen very sparsely punctate. Length .54 inch; 13.5 mm. 



Male. — Club of antennae nearly as long as the funicle. Abdomen moderately 

 convex, fifth segment with a subtriangular gibbosity at middle, sixth nearly as 

 long as the fifth. Pygidium broad, moderately convex, sparsely punctured. 

 Claws alike on all the tarsi, each with a small tooth near the middle and under 

 high power a feeble crenulation. Posterior tibise stout, coronary ridge strong, 

 spurs slender, slightly curved and somewhat pellucid at tip, tarsi about as long 

 as the tibifB. 



Female. — Club of antennae small, ovate. Abdomen convex without special 

 characters, last ventral shorter than the preceding. Pygidium wider than 

 long, rather flat, sparsely punctate. Claws similar on all the tarsi, each with 

 a moderately strong acute tooth at middle but with no crenulation. Hind 

 tibife stout,'^spurs rather Ijroader and more curved than the male, tarsi evi- 

 dently shorter than the tibise. 



■This species is one of the few on which I have not found any 

 elytral pubescence. It may be known by its strong posterior tibiae, 

 which resemble those of Ligyrus. 



■ Occurs in Nevada, Idaho and Oregon. 



li. tiillidus n. sp. — Oblong, subcylindrical, pale castaneous, surface shi- 

 ning. Head densely and moderately coarsely punctured, front flat, clypeus 

 transverse, angles broadly rounded, apex feebly emarginate, margin moder- 

 ately reflexed. Thorax nearly twice as wide as long, apex slightly narrower 

 than base, sides arcuate, very obtusely subangulate, margin entire, not fimbri- 

 ate, disc moderately convex, shining, coarsely punctured, sparsely at base and 

 sides, more densely along the apical margin. Elytra coarsely but not densely 

 punctured, sutural and one discal costa feebly elevated. Metasternum at middle 

 coarsely and very sparsely punctured, punctures denser toward the sides, sur- 

 face sparsely pubescent. Length .40 inch; 10 mm. 



Male.' — Unknown. 



Female. — Club of antennae ovate, shorter than the funicle. Abdomen moder- 

 ately convex, sparsely punctate, last segment scarcely half as long as the pre- 

 ceding. Pygidium coarsely but not densely punctured. Claws alike on all 

 the tarsi, each with a moderately stronz acute tooth near the middle and very 

 finely crenulate toward the base. Hind tibiae with slender unequal spurs, tarsi 

 as long as the tibiae. 



