[19] 



NORTH AMERICAN COLEOPTERA. 175 



long; sides strongly rounded, thence convergent and deeply sinuate to the 

 base which is broadly arcuate, nearly three-fourths as wide as the disk and 

 oue-third wider than the apex; the latter transversely truncate; basal angles 

 slightly obtuse, not rounded; disk very feebly and sparsely punctate, broadly, 

 strongly convex, having in the middle near the base a very deep, nude fovea, 

 continued anteriorly to within two-fifths the length of the apex by a narrow, 

 not deeply impressed channel; on each side and slightly in advance of the 

 fovea, a rather large, obtusely pointed tubercle; also near each basal angle a 

 large, deep, irregular, nude fove.i, continued anteriorly by a very broadly 

 and feebly impressed arcuate channel, and connected with th^ median fovea 

 by a narrow, extremely feeble, transverse line. Elytra at base equal in width 

 to the base of the pronotum, at apex two and one-third times as wide; sides 

 evenly, rather strongly arcuate; together transversely truncate behind, nearly 

 as long as wide; disk evenly, moderately convex, very minutely, sparsely, 

 feebly punctate; sutural striaa approximate, distinct; discal very broadly 

 impressed, becoming extinct at one-third the length from the base. Abdomen 

 as wide as and slightly longer than the elytra, convex, very minutely, sparsely 

 punctate. Legs long, slender; femora rather abruptly swollen before the tip. 

 Length 2.1 mm. 



California; (Anderson Val., Mendocino Co. 1.) 

 The male, lias near the apex of the abdomen beneath, a 

 large, very deeply-impressed fovea, wider than long, with 

 the anterior edge broadly and roundly sinuate in the middle. 

 There are two small, deeply-impressed fovese near the basal 

 margin of the pronotum on each side, the outer being at the 

 basal angles as seen from above. 



B. zephyrinilS u. sp. — Moderately robust, very convex, rufous; elytra 

 brighter; abdomen slightly darker; legs and antenna; darker, rufous; the lat- 

 ter pale at apex; integuments highly polished; pubescence coarse, sparse. 

 Head about as wide as long; eyes rather small, prominent; sides behind them 

 strongly convergent and very feebly arcuate to the neck; the latter broadly 

 sinuate, much less th. in one-half as wide as the width at the eyes; on a Line 

 through the middle of the eyes two small, nude, very deeply, longitudinally 

 impressed fovea?, connected by a strongly arcuate groove, the sides of which 

 are parallel in the basal half of its length; antennal tuberculations prom- 

 inent, coarsely punctate; antenna; long, slender, much longer than the head 

 and prothorax together; basal joint moderately robust, subcylindrical, longer 

 than wide, eleventh joint robust, conoidal, very obliquely pointed. Pro- 

 thorax widest at two-fifths the length from the apex where it is fully as long 

 as wide, as wide as the head; sides strongly arcuate, thence convergent and 

 distinctly sinuate to the base; the latter broadly arcuate, three-fourths as 

 wide as the disk, one-fourth wider than the apex; the latter transversely 

 truncate; disk strongly convex, finely, sparsely, feebly punctate; near the 



