ROLAND HAYWARD. 119 



105. B. diibitans Lee. — Form moderately elongate, slicrbtly convex ; color 

 black, more or less aeneous or sometimes tinged with bluish, the elytra usually 

 with a post-humeral spot of variable size reddish yellow, the latter sometimes 

 obscure or entirely wanting, rarely also with a small submarginal one of the same 

 color behind the middle. Head slightly narrower than the thorax ; palpi black ; 

 antennte about one-half as long as the body, dark piceous or black, Prothorax 

 cordate, rather more than one-half wider than long, distinctly narrower at base 

 than apex, sparsely punctate at base; apex truncate; median line fine, nearly 

 obsolete; anterior transverse impression distinct, the posterior feeble ; basal im- 

 pressions small, moderately deep, unistriate ; sides with the margin narrowly 

 reflexed, arcuate, feebly sinuate in front of the hind angles, which are small and 

 rectangular, with a very short, fine carina. Elytra nearly one-half wider than 

 the thorax, elongate, oblong-ovate, finely striate; strife punctate; intervals flat, 

 the third with the first dorsal puncture about one-third from base, the second 

 about one-third from apex. Beneath black, shining. Legs dark piceous or nearly 

 black, the tibiae and tarsi often paler. Length .11-.15 inch ; 2.75-3.75 mm. 



As above defined this species includes crurale Leo. A study of 

 LeCoute's types shows that the only difference between dubitans and 

 crurale consists in the presence of a subhumeral spot in the former, 

 which is lacking in the latter species. In a moderately large series 

 this spot gradually disappears, so that the two species must be united. 

 Dr. LeConte associated it with affine, apparently overlooking the 

 fact that the thorax is pedunculated, although to a less degree than 

 in quadrimaculatum, and much less so than in jueundum, in which 

 this character seems to attain its greatest development. 



It is very closely allied to midatum, but may be recognized by the 

 broader thorax, the hind angles of which are small, but distinct, 

 with a very small carina. The form is somewhat more robust. 

 Specimens in which the subhumeral spot is wanting resemble jwce- 

 einctum quite closely, but the elytra are not alutaceous, with the 

 stripe more deeply impressed. 



It is known to me from Cheyenne, Wyo., Buena Vista and Gar- 

 land, Col., AVilliams, Ariz. ( Wickham), Nevada, California, Oregon, 

 Washington, British Columbia and Vancouver Island. I have also 

 seen one specimen fi-om Fort Simpson. 



106. B. iniitatum G. & H. — Form slender, elongate, moderately convex ; 

 color black, slightly aeneous, the elytra with a yellow or reddish yellow post- 

 humeral spot. Head slightly wider than the thorax at apex ; palpi piceous; an- 

 tennae about one-half the length of the body, piceous or nearly black, the basal 

 joints more or less rufous, especially beneath. Prothorax cordate, scarcely one- 

 half wider than long, very distinctly narrower at base than apex, sparsely punc- 

 tate at base; apex feebly emarginate: median line fine, abbreviated before and 

 behind ; anterior transverse impression nearly obsolete, the posterior feeble ; basal 

 impressions small, unistriate; sides with the margin very narrowly reflexed, 



TRANS. AM. ENT. SOC. XXIV. APRIL, 1897. 



