Coleopterological Notices, V. 295 



two to four broadly, feebly sinuate. Legs rather short ; basal joint of the 

 hind tarsi as long as the next two and equal to the fifth. Length 2.5 mm. ; 

 width 0.7 mm. 



Utah (southwestern). 



The trimaculate elytra, pale coloration, feeble punctuation and 

 conical prothorax, with the base rather loosely fitted over the base 

 of the elytra, are distinguishing characters of this rather isolated 

 species. 



O. saxatilis* — Rather narrow and subparallel, blackish-piceous, the 

 abdomen black, the apices of all the segments paler ; legs pale throughout ; 

 antennae dark, pale toward base ; integuments densely opaque, finely, very 

 densely punctate, the abdomen not less densely so, the elytra more distinctly ; 

 pubescence fine, short, recumbent, extremely dense throughout, the abdomen 

 without longer setae toward apex. Head a little wider than long, well inserted, 

 three-fifths as wide as the prothorax, the eyes moderately large, approaching 

 the base within one-half of their length ; antennae slender, feebly incrassate, 

 loosely articulated, about as long as the head and prothorax, the second joint 

 much longer than the first and nearly as long as the next two, four to six 

 slightly increasing in width, six to ten subequal, slightly transverse, eleventh 

 acutely ogival, as long as the preceding two. Prothorax two-thirds wider than 

 long, the sides convergent and distinctly arcuate from base to apex ; base 

 broadly arcuate, two-thirds wider than the subtruncate apex ; basal angles 

 obtuse but evident ; disk not distinctly impressed. Elytra throughout the 

 length exactly equal in width to the prothorax, one-third longer ; sides 

 parallel, nearly straight ; humeri concealed ; disk with a small and just 

 visible impression behind the scutellum. Abdomen at base slightly narrower 

 than the elytra, at the apex of the fifth segment three-fourths as wide as the 

 latter, distinctly longer than the anterior parts ; sides straight and just visi- 

 bly convergent from base to apex ; border rather thick ; tergites two to four 

 \iiYy feebly sinuate at apex ; fifth one-half longer than the fourth. Legs 

 slender ; posterior tarsi filiform, the basal joint slightly longer than the next 

 two and much longer than the fifth. Length 2.5 mm. ; width 0.6 mm. 



Colorado (Canon City). Mr. Wickham. 



Readily recognizable by the parallel elytra, very nearly as long 

 as wide, and by the opaque integuments. 



O. glenorae. — Narrow and elongate, pale brownish-testaceous, the head 

 darker, rufo-piceous ; abdomen blackish, the apices of the segments paler ; legs 

 pale throughout ; antennae piceous, paler toward base ; integuments feebly 

 shining, extremely minutely and densely punctate throughout, scarcely more 

 distinctly on the elytra ; pubescence minute, extremely dense throughout, the 

 abdomen also with a few stifi" bristles toward apex. Head slightly wider than 

 long, well inserted, evenly convex, not quite two-thirds as wide as the pro- 

 thorax ; eyes moderate, at nearly their own length from the base ; antennae 



