ClCINDELID^; AND CARABID^ 1 09 



in size, the antennae testaceous, rather stout; prothorax moderate, 

 distinctly wider than long, the edge fine and even, the sides lather 

 strongly arcuate, converging and gradually feebly sinuate basally, 

 the angles nearly right, sharply defined; base sinuate medially, 

 margined in outer fourth, five-sixths the maximum width; surface 

 nearly as in the preceding, except that the inner impression is 

 much narrower and feebler and the outer not evident, except oc- 

 casionally and very obsoletely; elytra oval, rather convex, not quite 

 one-half longer than wide, a fourth wider than the prothorax, with 

 fine but very deeply impressed striae and rather strongly convex 

 shining intervals in both sexes throughout; humeral denticle distinct, 

 the scutellar stria generally represented by a coarse subbasal punc- 

 ture. Length (c? 9 ) 8.6-10.0 mm.; width 3.0-3.7 mm. British 

 Columbia (Metlakatla and Inverness), Keen castaneus Dej. 



The male sexual characters at the abdominal apex are feeble 

 throughout, except in serripes, where there is an abrupt and very 

 strong medial carina at the extreme tip, surrounded by a depression 

 of the surface. A part of the differences noted between sequoiarum 

 and tarsalis is probably due to the sex of the specimens compared, 

 but by no means all; for example the strong strial punctures of 

 the former, somewhat crenating the sides of the intervals, cannot be 

 accounted for in this way; the striae in tarsalis, in which species the 

 surface is more flattened than in any other known to me, are said to 

 be impunctate, and, under transverse illumination, no vestige of 

 punctuation is to be seen, but when viewed under longitudinally 

 oblique light the punctures become very obvious. I infer that my 

 representatives are properly identified, as they agree with the 

 description in all other features and are from the same local water 

 system. Amethystinus and novellus are appreciably different when 

 viewed in large series; the female is, on the whole, distinctly smaller 

 than the male and varies more in size, which is decidedly an excep- 

 tion to the general rule. The female differs from the male in a 

 different manner in the various species; in some, such as cuneatulus, 

 in the more cuneiform, opaque and less costulate elytra; in others 

 simply in smaller size, while in some, such as planctus and castaneus, 

 there is very little sexual difference. 



Group II calif ornicus Dej. 



In this group the prothorax is rather large and convex as a rule, 

 but always distinctly shorter than wide, the linear impressions of 

 the head and pronotum smaller and shallower and the elytral striae 



