Coleopterological Notices. 45 



width of the hypomera at their apex, and are distinctly open, the 

 sides however being parallel, and not angulate and more open 

 toward the cox^e, as in the annularis group. The sutures are 

 entirely obsolete, and the mentum is nearly as in armatus. 



B. furtivus n. sp. — General form and sculpture nearly as in armatus, the 

 tubercles of the vertex being smaller and more a2:)proximate, and the epistomal 

 processes shorter ; outer joints of antennae very slightly more transverse. Pi-o- 

 thorax scarcely perceptibly narrower than the base of the elytra, rather strongly 

 transverse, two-fifths wider than long ; sides parallel and straight, strongly 

 convergent in basal third and nearly straight, the basal angles very obtuse 

 and very broadly rounded, but more distinct than in stremius; lateral angles 

 obtuse but very narrowly rounded and distinct, apical right and very broadly 

 rounded, the apex broadly and very distinctly arcuate throughout the width, 

 otherwise nearly as in stremius. Elytra scarcely as long as wide, about two- 

 fifths longer and, near the apex, fully one-fourth wider than the prothorax, 

 the sides distinctly divergent. Ahdome.n entirely impunctate along a broad 

 and distinct median line, finely and rather densely punctate beneath. Length 

 5.0 mm. 



Oregon (The Dalles). Mr. H. F. Wickham. 



Although the abdominal punctures are sparser along the middle 

 in ar^natu.s, there is no well-defined line in which they are entirely 

 absent, as in furtivus; this line is, however, broad and almost 

 entirely free from punctures in strenuus. 



This species, the description of which is taken from the male, 

 differs greatly from armatus in its much shorter and more trans- 

 verse prothorax, with distinct lateral angles, and from strenuus in 

 the broadly rounded apex and apical angles of the same part. The 

 prosternal sutures are more distinct than in either of the preceding 

 species, and because of the greater depression of the apical angles 

 of the pronotum, the hypomera ai'e, at apex, distinctly less than 

 one-half as wide as at the coxal fissure; the latter is slightly shorter 

 than the hypomera! width in continuation of it, and is narrowly 

 open, being intermediate between the same part in armatus and 

 strenuus. The hypomera are not distinctly impressed externally. 

 The mentum is nearly as in the two preceding species. 



The three species armatus, strenuus and furtivus, although 

 closely allied, are almost undoubtedly distinct; if however this 

 should prove not to be the case, the structure of the prosternum 

 and hypomera must be considered of very little value, even in the 

 separation of species. 



