396 Coleopterological Notices, V. 



J^ew York ; !N'orth Carolina ; Nebraska. 



The female does not differ greatl}^ but has the head distinctlr 

 smaller. The sixth ventral plate of the male is not sinuate at apex, 

 the seventh narrowly and feebly bisinuate in the middle at apex, 

 the median lobe more advanced, small and broadly subanf^ulate. 

 The mental groove is coarse and deep. This species is readily dis- 

 tinguishable from vitidulvs Grav., by its smaller size and much 

 finer closer and aciculate sculpture of the elytra. It unquestion- 

 ably does occur with ants, but I believe only occasionally, as I 

 have found it in localities which were apparently not connected in 

 any way with their nests. 



O. soliriniis Lec.-i-Trans. Am. Ent. Soc, VI, 1877, p. 237. 



Rather broad, depressed, moderately shining, black, the elytra 

 with a slight piceous tinge ; legs paler, piceo-testaceous ; antennas 

 scarcely at all paler at base. Head feebly trisulcate, strongly punc- 

 tate, distinctly narrower than the prothorax, the eyes well devel- 

 oped, at their own length from the basal angles, the tempora par- 

 allel, not at all more prominent than the eyes ; antennae strongly 

 incrassate, the last joint not quite as long as the two preceding. 

 Prothorax nearly as in vitidulus, but more densely sculptured. 

 Elytra distinctly wider and nearly one-half longer than the pro- 

 thorax; sides rather strongly divergent; disk between the slightly 

 swollen upper limits of the flanks perfectly flat, finely, confluently 

 punctate and closely, longitudinally rugose. Abdomen distinctly 

 narrower than the elytra, parallel, finely reticulate, feebly aluta- 

 ceous, finely, sparsely, subgranularly punctulate and minutely, 

 sparsely pubescent, much more distinctly so beneath. Length 

 1.9-2.6 mm.; width 0.6-0.15 mm. California (Humboldt to Los 

 Angeles) ; Southwestern Utah. 



The head in the female is distinctly smaller. In the male the 

 sixth ventral plate is unmodified, the seventh feebly bisinuate in 

 the middle, the small median lobe slightly produced, rounded and 

 extremely minutely fimbriate along its apex. The groove of the 

 mentum is coarse, deep and entire. This species is allied to nitidu- 

 h(s and suspectus, but differs in its broader form and in the much 

 finer, denser, substrigose sculpture of the elytra. 



O. Tegrandis n. sp. — Slender, parallel, depressed, feebly shining, 

 minutely strigilate, black, the elytra piceous ; legs pale, the femora blackish ; 



