Coleopterological Notices, V. 471 



fovea and tase minutely carinate, with two feeble fovese at each side near the 

 basal margin. Elytra not quite as long as wide, one-half longer than the 

 prothorax and about twice as wide, convex ; humeri tumid and minutely 

 spiculate. Abdomen impunctate, the first segment longer than the fourth, 

 with two minute basal carinse separated by one-sixth of the entire width. 

 Length 1.9 mm. ; width 0.65 mm. 



California. 



The two specimens in my cabinet are males, the venter having a 

 small deep rounded impression near the apex. The elytral punc- 

 tures are not large but strong, asperate and very sparse. 



B. denticauda n. sp. — Rather slender, polished, piceous-brown, the 

 elytra rufescent ; pubescence very sparse, coarse. Head but slightly wider 

 than the prothorax, including the labrum a little longer than wide ; eyes 

 small, just behind the middle ; basal parts behind them almost semi-circu- 

 larly rounded ; vertex impunctate ; occiput feebly carinulate at base ; sides 

 longitudinally carinate above ; fovese connected by a sulcus which is feeble 

 in front ; interantennal depression feeble ; antennae short, not longer than 

 the head and prothorax, the club gradual and heavy, eleventh joint with a 

 slender anteriorly oblique tooth at basal fourth. Piothorax as long as wide, 

 widest just before the middle ; disk polished, minutely, very remotely punc- 

 tulate ; lateral grooves feeble, median impressed and traceable to apical fourth 

 or fifth ; subbasal spines strong, simple ; biarcuate transverse sulcus distinct ; 

 lateral fovese well impressed ; surface between the median fovea and base 

 finely carinulate ; two sublateral fovese at each side near the basal margin. 

 Elytra not quite as long as wide, one-half longer than the prothorax and twice 

 as wide ; humeri elevated and with a minute recumbent spiculate tooth ; disk 

 distinctly but very remotely punctate. Abdomen as wide as the elytra but 

 shorter, the basal dorsal longer than the next two combined, the carinse short, 

 distant between one-fifth and one-sixth of the total width. Legs moderate. 

 Length 1.9-2.0 mm. ; width 0.65-0.7 mm. 



California (Siskiyou Co.). 



The description is taken from a male specimen, the ventral 

 modification consisting solely of a rather small but deep rounded 

 impression near the apex. In the female the curious pygidial cari- 

 niform elevation is identical with that of the male, but the venter 

 is not excavated; there is often, however, a very feeble impression 

 at the position of the male excavation, this community of male and 

 female impressions of the last ventral being a common character 

 throughout large sections of the Coleoptera, as I have elsewhere 

 shown ; it is observable also in albionicus. An analogous condi- 

 tion, relating to the manifestation of male antennal structures in a 

 rudimentary form in the antennas of the female, will be referred to 

 under Beichenbachia tumida and its allied species. 



