THE CANADIAN ENTOMOLOGIST. 277 



Form less stout, smaller in size, moderately convex, shining, testaceous, 

 the pubescence rather more herissate and evident ; head more 

 transverse, with slightly smaller fovea?; antenna? nearly similar, the 

 penultimate joints slightly more transverse ; prothorax somewhat 

 wider than the head, of the usual form and with the usual sulci and 

 fove?e, but having the sculpture between the transverse groove and 

 base granulose and not rather coarsely and simply punctate as in 

 basa/is, the lateral teeth smaller and more angular ; elytra nearly as 

 in basa/is, but with less evident humeri, the abdomen almost similar, 

 rather shorter than the elytra and virtually as wide. Afak with 

 nearly similar sexual characters. In the original description the 

 posterior abdominal tooth was erroneously described as pertaining to 

 the tip of the third segment. California (Marin Co.) . . cavicauda, Csy. 



14. Form slender, moderately convex, testaceous, distinctly and coarsely 

 though sparsely pubescent; head and antennse nearly as in cavicauda, 

 the former with very small sparse granules, the antennae about as 

 long as the head and prothorax, the latter slightly wider than the 

 head, very nearly as long as wide, having the usual sulci and foveae, 

 the surface finely, sparsely, subasperately punctulate, the area between 

 transverse groove and base finely and sparsely granose ; lateral teeth 

 extremely feeble and obtuse ; elytra as long as the head and pro- 

 thorax, the humeri distinct, the sides broadly arcuate, the striae as 

 usual ; abdomen evidently shorter than the elytra, though about as 

 wide, the basal segment long but very evidently less than half the 

 length from above. Length, 1.4 mm.; width, 0.48 mm. California 

 (Siskiyou Co.) debilis, n. sp. 



The last species is founded upon a specimen formerly placed with 

 cavicaiida (Ann. N. Y. Acad., VII, 1893, p. 448); it is assumed to be a 

 female, but differs from the female of basa/is, which has the fourth dorsal 

 feebly convex and similar to the others, in having that segment broadly 

 flattened or feebly concave. It is evidently a distinct species. 



The third group, comprising the last three species of the table, has 

 very much more accentuated male sexual characters than the others, and 

 the more elongate first dorsal gives its species a peculiar appearance; they 

 are the smallest of the genus, but otherwise there is no difference of a 

 generic nature ; the relative size of the basal segment therefore appears to 

 be of very much less significance here than among the allies of Trimitwi. 



