570 Coleopterological Notices, IV. 



ORTHORIS. 



LeConte— Proc. Am. Phil. Soc, XV, p. 286. 



The external appearance of the species composing" this genus cer- 

 tainly conveys but little idea of their true affinities, for, as remarked 

 by Dr. LeConte, they quite closely resemble Orchestes. Rhopto- 

 baris constitutes, however, an excellent connective bond in every 

 way with the more usual habitus of the tribe. 



There are several inaccuracies in the original diagnosis of the 

 genus, which is drawn from the female alone. The beak is stated 

 to be "not curved," and the prosternum "broadly though not deeply 

 sulcate in front." The beak, even in the very long slender form 

 occurring in the female of crotchi, is feebly, though very sensibly, 

 curved, and in the male of crotchi and female of cylindrifer , it 

 becomes quite conspicuously so. The modification of the prosternum 

 is peculiar, this part being rather narrowly and deeply impressed 

 along the middle, but not at all abruptly sulcate ; the peculiarity 

 consists in the fact that the canaliculation is not a depression below 

 the general surface of the prosternum as in other genera, but is 

 caused by a tumid elevation before each coxa, the impression being 

 an intervening valley between the two prominences. 



The beak in Orthoris is slender and separated from the head by a 

 transverse impression, which is narrower and much stronger than 

 in Rhoptobaris ; but in the structure of the prostomal lobe and 

 mandibles the two genera are nearly similar. The antennae are of 

 the same aberrant t}^pe as in Rhoptobaris, the club being sometimes 

 greatly elongate, a form feebly suggested in the genus Hesperobaris. 

 The front coxae are very narrowly but distinctly separated. 



Our two species may be easily recognized as follows : — 



Lustre alutaceous ; setae longer, confusedly dispersed on the elytral intervals ; 

 pronotal punctures finer and dense; beak in the female very long and 

 slender, the antennal club in that sex not quite as long as the funicle. 



1 crotchi 



Lustre polished ; setae shorter, much sparser and more rigid, arranged in a 

 single line on each interval ; pronotal punctures rather coarse and not so 

 dense ; beak in the female much shorter and more arcuate, the antennal 

 club distinctly longer than the entire funicle 2 cylindrifer 



1 Orthoris crotchi LeConte— Proc. Am. Phil. Soc, XV, p. 286. 



Moderately short and stout, convex, black throughout and some- 

 what dull in lustre, the setae rather long, subrecumbent, flexible, 



