Canadian Coleoptera. 253 



the front part of the femora of a dark greenish color. The 

 form is also somewhat more elongate and less compact. If 

 deserving of a distinct name it might appropriately be called 

 purpurans. 



Both specimens were collected by Mr. Selwyn, of the 

 Geological Survey, in British Columbia. 



Pterostiohus (Dysidius) stenopus, sp. nov. (Fig. 2.) 



Ater nitidus, angustius elongatus ; prochorax latitudine 

 longior, tenuiter marginatum, lateribus modice rotundatus, postice 

 angustatus et punctulatus, dorso canaliculars, impressionibus 

 basalibus simplicibus et rugose punctatis, elytra vix latiora, 

 striata, tripunctata, interstiis convexis evidenter punctulatis, 

 apice sinuata, stria scutellati longa, marginali simplici, para- 

 pleural latitudine longiores, punctulatce ; subtus piceo-niger niti- 

 dus ; trophi, antenna 3 , (articulis tribus basalibus exceptis') pedi- 

 busque piceis ; abdominis segmenta lateribus subimpressa, basi 

 crebro subtiliter punctulata, tibiae maris posteriores introrsus 

 villosce, articulis tribus extus sullcatis. Long. *46 poll. =11 "T 

 mm. 



SimilliusV. luctuoso forma, at notisaliis exceptis prothoracis 

 foveis simplicitus facile distinguendus, ab affinibus forma 

 augustivri sat distinctus. 



In shape not unlike P. luctuosus, Dej., but may be at once 

 separated by its single thoracic impressions, which arc 

 punctured almost to the dorsal line. The abdominal segments 

 are very shining, with a slight pitchy tint posteriorly, and 

 the femora are darker than the tibiae. 



This species would seem to take its place more properly 

 in the Dysidius group than in any other. I have but a 

 single example, a male, collected at St. Eose, P.Q. 



The group of which P. mutus, Say, may be taken as a 

 sample, and which corresponds, in part, to the sub-genus 

 Dysidius of Chaudoir may be defined by the following 

 characters : — 



The thorax is finely margined, but little narrower behind, 

 scarcely sinuate on the sides, with the posterior angles 

 generally obtuse, rarely slightly prominent, and the anterior 



