260 GEO. H. HORN, M. D. 



Witli the large material now before me this matter has been care- 

 fully investigated, and there has not been found any very great re- 

 semblance in external form and scul})ture between the species of this 

 group and any other, except possibly in the case of limala and 

 cephaUca, and here as in all other cases the secondary sexual char- 

 acters of the male are quite different. The species at present known 

 may be approximately separated as follows : 



Body with erect hairs rather sparsely placed ; form moderately elongate and 



parallel 45. liirsuta. 



Body above entirely glabrous, with the exception of erect hairs on the head. 

 Clypeus with scarcely a trace of emargination ; ventral se.xual characters 'J, 



feeble 46. coinans. 



Clypeus very distinctly emargiiiate. 



Sutural stria deeply impressed, the sutural costa of normal width and con- 

 vexity ; autennal club % as long as or longer than the stem. 

 Species more or less ovate ; tarsal claws unequally toothed in the sexes. 

 Last ventral % convex, the penultimate concave with a tuberosity each 



side 47. iinplieita. 



Last ventral % concave, the penultimate segment with a transverse, 



obtuse ridge 48. balia. 



Species elongate, parallel ; tarsal claws with a long tooth in both sexes. 



49. vilIifroii!>i. 



Sutural stria feebly or not impressed, sutural costa narrow, scarcely elevated. 



Surface with normal lustre ; upper outline viewed laterally convex ; py- 



gidium 9 not gibbous at apex 50. liiiitila. 



Surface polished as if varnished ; upper outline of elytra flat ; pygidium 

 gibbous at apex 51. nitida. 



45. liir!<iiita Knocb. — Oblong, nearly parallel, ferruginous brown to piceous, 

 feebly shining, sparsely clothed with yellowish erect hairs, longer on the thorax. 

 Head densely and coarsely punctured with moderately long hair, clypeus emar- 

 ginate, the border moderately reflexed. Thorax widest at middle, slightly nar- 

 rowed at base, more at apex, the margin entire, ciliate, basal margin channeled 

 externally, surface with coarse punctures moderately closely placed, with long 

 erect hairs. Elytral punctures much finer than those of the thorax, less im- 

 l)ressed, denser and somewhat rugnlose, the hairs sparser and shorter than on 

 the thorax, the discal costfe not distinct. Pygidium moderately and not closely 

 jninctate % , coarsely and closely 9 - sparsely hairy. Metasternum densely punc- 

 tured, the hairs yellow moderately dense, much longer in the male. Abdomen 

 sparsely punctate at the sides, the second segment more densely % , the last two 

 segments more coarsely. Claws arcuate, a strong acute median tooth. Last joint 

 of maxillary palpi slender fusiform, not impressed. Length .58 — .72 inch; 15 — 

 18 mm. 



Male. — Antennal club a little longer than the stem. Abdomen 

 slightly flattened at middle, the penultimate segment at middle with 

 a transverse, arcuate, rugulose elevation, behind which is a concavity. 

 Last ventral flat. Inner spur of hind tibia fi.xed, a little shorter and 

 stouter than the outer. 



