436 



Coleopterological Notices, IV. 



toward apex, subglabrous, three-fourths as long as the prothorax, with two 

 parallel uneven grooves on the disk, rather distant and obsolete at the middle, 

 and, on each side at the declivity, a longitudinal groove, entire, but becoming 

 feebler toward the apex, also coarsely punctate at the sides toward base, the 

 punctures of the upper surface near the apex almost obsolete ; antennae mode- 

 rate, the first funicular joint rather slender, obconical, second slightly longer 

 than the third, club rather small, evenly elliptical, less than one-half longer 

 than wide. Prothorax strongly convex, one-fourth longer than wide, the apex 

 broadly arcuate, much wider than the base ; sides feebly divergent from the 

 apex to the middle, then more strongly convergent and nearly straight to the 

 base ; disk finely, remotely and unevenly punctate, the punctures impressed 

 and distinct. Elytra at base two-thirds wider than the base of the prothorax, 

 slightly but distinctly wider behind the middle, three-fourths longer than 

 wide, the series scarcely at all impressed and composed of rather small, mode- 

 rately close-set punctures. Legs rather stout, the femoral teeth large ; tibiae 

 only just visibly bent toward base. Length 4.7-5.0 mm. ; width 1.7-1.8 mm. 



Arizona. 



Allied closely to myrmex, but larger and stouter, with the elytra! 

 series finer and less impressed. I should have referred the two 

 specimens in my cabinet to mexicanus Chev., as they agree toler- 

 ably well with the description of Rosen skoeld, but the elytra are 

 evidently much shorter, their length being given as almost three 

 times that of the prothorax in that species, while in ruficornis they 

 are only twice as long. 



13 O. myrmex Hbst.— Kafer, VII, p. 56; Horn: Proc. Am. Phil. Soc, 

 XIII, p. 450; myrmecodes Say: Cure. p. 15; Ed. Lee, I, p. 278; americanus 

 Chev. : Ann. Ent. Soc. Fr., I, 1832, p. 105 ; Gyll. et Rosen. : Sch. Cure. Ill, p. 

 366; VII, p. 205. 



Narrowly and very feebly subcuneate, very strongly convex, 

 polished, black throughout, the upper surface with numerous long 

 erect blackish hairs, on the elytra disposed in a single widely-spaced 

 series on each interval, on the under surface and legs generally 

 whiter, the sternal side-pieces densely clothed with white pubescence, 

 recumbent, and tufted in structures as usual. Beak short; antennae 

 slender, the funicular joints two to four subequal, each slightly 

 elongate ; eyes moderate, separated by a little less than their own 

 width. Prothorax strongly convex before the middle, sparsely, 

 rather strongly and unevenly punctate, one-fifth longer than wide, 

 the apex broadly arcuate and but slightly wider than the base. 

 Scutellum densely pubescent. Elytra very nearly twice as long as 

 wide, rather distinctly wider behind ; punctures coarse, the series 



