48 MEMOIRS ON THE COLEOPTERA 



not one-half longer than wide, but the humeri, which are wholly 

 obliterated in in gens, are rounded though as distinct as in many 

 other species, such as gregaria or even eschscholtzi; it is a remark- 

 ably isolated species and without any close ally. Again LeConte 

 puts mannerheimi and eschscholtzi in a group by themselves and 

 places gregaria, obliqua and metallica in a single group, which he 

 holds to be different from the eschscholtzi group. In this I cannot 

 possibly agree; the habitus is very different in the three species 

 mentioned and they should go in different groups. I have assumed 

 gregaria to be similar in its features to trifaria, having the same very 

 long and subdepressed, posteriorly broadening elytra, with very 

 feeble humeri; both of these species are wanting in my collection, 

 although there are some that are closely allied, such as mobilis, 

 catenata and cuneata. The new forms in my collection may be 

 assigned to the following groups: 



Group ingens Horn. 



This is a small group, composed of two species besides ingens, one 

 ovipennis Lee., of which I have a very good example from Placer 

 Co., taken by Koebele and the other as follows: 



Nebria columbiana n. sp. Moderately slender, unusually convex, 

 shining, black, the abdomen rufescent apically; legs black, the tarsi 

 piceous; first four antennal joints black, the remainder testaceous; head 

 smooth, with two small and feeble impressions which are obsoletely 

 rugulose; antennae slender, three-fourths as long as the body; prothorax 

 much wider than the head, two-fifths wider than long, strongly rounded 

 at the sides anteriorly, the sides strongly converging and sinuate pos- 

 teriorly, becoming parallel and straight for a long distance before the 

 angles, which are very acute and somewhat posteriorly produced, the 

 base truncate between them, less than three-fifths the maximum width; 

 sides moderately reflexed; impressions distinct, almost impunctate, those 

 near the angles deep and with a few punctures; elytra oval, nearly twice 

 as long as wide, one-half wider than the prothorax, widest slightly behind 

 the middle, the sides broadly, evenly arcuate and gradually converging 

 to the base, without trace of humeri, more obtusely rounded behind; 

 surface very convex and shining, brilliant violaceo-cupreous in color, 

 the striae deeply impressed, impunctate and with strongly convex inter- 

 vals, having three foveae on the third, none on the fifth and three on the 

 seventh, all interrupting the intervals; legs and tarsi long and slender, 

 the stiff hairs beneath the latter conspicuous. Length (cT) 10.0 mm.; 

 width 3.9 mm. British Columbia (Inverness), Keen. 



One of the most brilliant and isolated species of the genus; besides 



