428 Coleopterological Notices, IV. 



6 — Elytral series feebly impressed, coarsely, deeply and rather remotely 

 punctured 8 floridanus 



•V — Eyes separated by much less than one-half of their own width. 



Elytral punctures fine, the series not impressed on the disk, the setae con- 

 fined in great measure to the alternate intervals, except toward apex ; 



body rather stout 9 laevicollis 



Elytral punctures coarser, the series just visibly impressed, the setae more 

 abundant and conspicuous, widely spaced along all of the intervals ; body 



smaller and narrower 10 speculator 



Eyes widely separated. 



Elytra strongly inflated behind, the setae very sparse, rather short, whitish 



in color and only distinct toward apex 11 myrmecodes 



Elytra but slightly wider behind the middle than at base ; setae numerous, 

 long, blackish in color ; strial punctures coarser. 



Body stouter, the antennae rufous 12 rilficorilis 



Body slender, the antennae black 13 myrmex 



S — Ferruginous, the elytra blackish in apical half or more ; body with short, 

 white, slender, sparsely scattered and recumbent squamules ; femoral 



teeth very minute 14 di enrolls 



9 — Polished, black, the legs, beak and antennae piceous ; pronotum and elytra 

 glabrous, without erect setae, except a few borne from a series of punctures 

 along the apical margin of the former on the flanks, and, on the latter, 

 several toward apex, and one much longer and isolated on each side of 

 the scutellum 15 cavirostris 



The division of the genus by the form of the prothorax is im- 

 practicable, as, in several species, this part is more or less cylindrical 

 in the male and obovate in the female, notably so in speculator. 



1 O. vittatus Horn.— Proc. Am. Phil. Soc, XIII, 1873, p. 448. 



Elongate-oval, strongly convex, black, polished, densely clothed 

 with white pubescence formed of recumbent tufted hairs ; each 

 elytron with four narrow, feebly convex, abruptly defined, glabrous 

 vittae and a much narrower uneven line very near the suture, the 

 glabrous vittae narrow, but slightly more than one-half as wide as 

 the pubescent stripes, and each with a series of small widely and 

 unevenly spaced punctures bearing short piceous setae. Beak short, 

 thick, three-fifths to three-fourths as long as the prothorax, deeply, 

 unevenly punctate at the sides, the antennae inserted at apical two- 

 filths in the female and but just visibly beyond in the male. Pro- 

 thorax coarsely, unevenly punctate, with a polished fusiform tumid 

 and almost entire median impunctate line. Elytra but slightly 

 wider behind the middle than at base, almost twice as long as wide. 



