46 Coleojplerological Notices. 



B. monstratlis n. sp. — Rather slender and convex, parallel, dark testa- 

 ceous ; abdomen dark piceous-brown ; elytra paler, flavate throughout ; legs 

 and antennfp flavate ; head strongly shining, reticulato-granulose, the median 

 tubercles, antennal prominences and apical part of the epistoma highly polished 

 and not reticulate ; pronotum polished, very feebly reticulate near the punc- 

 tures ; abdomen moderately shining, very strongly reticulate. Head very small, 

 much narrower and shorter than the prothorax ; eyes moderately prominent ; 

 on a line through their apical third there are two very approximate prominent 

 tubercles, behind and between which there is a short feeble canaliculation ; 

 between them and the large prominent antennal tuberculations tliere are a few 

 small, rather distinct punctures ; suture short, transverse, feeble, not impressed, 

 situated immediately before the tubercles of the vertex ; apical angles of the 

 epistoma tuberculate, the tubercles gradually obsolete posteriorly, and slightly 

 more approximate than the angles ; antennae rather short and slender, the 

 three last joints abruptly wider forming a club ; second distinctly longer than 

 the third, four to seven moniliform and subglobular, eighth slightly wider, 

 transversely oval, ninth and tenth strongly transverse, eleventh short, ovoidal, 

 slightly narrower than the tenth, longer than wide. Prothorax large, about 

 one-fourth wider than long ; sides from near the apex to basal fifth parallel 

 and straight, then abruptly, broadly rounded into the base, without trace of 

 basal or lateral angles, the base broadly distinctly arcuate, the apex trans- 

 versely truncate ; apical angles right and distinctly rounded ; disk extremely 

 coarsely punctate, the punctures very strongly and broadly impressed, deep, 

 distant by rather less than their own diameters anteriorly, becoming much 

 finer and sparse toward base ; median groove wide, entire, very broadly and 

 deeply impressed, conspicuous. Elytra scarcely as long as the prothorax and 

 very distinctly narrower, scarcely as long as wide, very broadly and just visibly 

 impressed on the suture at the base ; sides very feebly divergent ; surface very 

 finely and densely punctate, the punctures distant by nearly twice their own 

 diameters ; pubescence dense, moderate in length. Abdomen just visibly wider 

 from base to apex, at which point it is fully as wide as the elytra ; sides 

 straight ; surface very finely, feebly, indistinctly and rather sparsely punc- 

 tate, rather finely, more distinctly and densely so beneath. Length 3.8-4.3 mm. 



California (San Francisco). 



The type of this interesting and very distinct species is a male, 

 but possesses no decided sexual modification at the apex of the 

 abdomen. It is closely related to crihricoUis Lee, but is immedi- 

 ately disting-uishable by its very large prothorax and small elytra. 

 It should form, together with cribricollis, a group distinct from the 

 armatns group of LeConte, because of its very short completely 

 closed coxal fissures, and three-jointed antennal club. 



The a])ical angles of the pronotum are abruptly and strongly 

 deflexed, the hy])omera wide, very deeply and broadly concave 

 throughout, the coxal fissures extremel}' short, closed and directed 



