THE CANADIAN ENTOMOLOGIST. 261 



few rather coarse but feeble punctures basally ; abdomen as wide as 

 the elytra, but not quite so long, slightly narrowed basally to the 

 elytral apex. Length, 2.25 mm.; width, 0.8 mm. California (Lake 



Tahoe), also northward to Washington State histraiis^ n. sp. 



Anterior transverse margin almost straight, the excavation slightly 

 larger than in lustra?is and more transverse. Body throughout 

 nearly similar, except that there is no evident median pronotal sulcus 

 before the fovea, the elytra not so inflated, and with less arcuate 

 sides, the sides evenly converging to the base, without trace of 

 humeri from a vertical viewpoint, the surface very minutely, sparsely 

 punctulate throughout, the two inner of the basal foveas separated by 

 their own diameter j abdomen similar in form, as long and wide as 

 the elytra ; colour very dark testaceous, the surface highly polished 

 throughout. Length, 2.1 mm.; width, 0.76 mm. California 

 (Tulare Co.) Ttdareamcs^ n. sp. 



4. Abdominal excavation of the male somewhat oval, about as wide as 

 long, its anterior transverse margin straight; body larger and stouter; 

 ninth antennal joint about as long as wide. British Columbia 

 (Vancouver to Metlakatla) Albionicus, Aube 



Abdominal excavation rounded, its anterior margin slightly arcuate 

 medially but scarcely observably so ; body much smaller and more 

 slender, the ninth antennal joint evidently transverse. California 

 (San Francisco to Sta. Cruz) speculum, Csy. 



Abdominal excavation much larger, decidedly transverse, its anterior 

 margin conspicuously arcuate and broadly projecting ; body other- 

 wise nearly as in speculum, except that it is not quite so slender, and 

 rather more coarsely pubescent. California (Soda Springs, Anderson 

 Valley, Mendocino Co.) Mendocino, Csy. 



Occiduus, Csy., belongs very near speculum and Me7idochio, but is 

 readily distinguishable by its shorter and more rapidly expanded elytra, 

 much longer abdomen and shallower abdominal excavation of the male 

 than in any of the above species ; it occurs in Humboldt Co., California. 

 Pygidialis, Csy., and cicatricosus, Bndl, are evidently very closely allied, 

 having the same very coarse scar-like elytral punctures and denticulate 

 humeri ; actual comparison of the types will be necessary to decide this 

 perhaps, if the language of the description of the latter should prove to be 

 misleading. 



