﻿Pec. 1895] WlCKHAM. COLEOPTERA OF N. E. AMERICA. 189 



three or four. First antennal joint rufous at base. Legs blackish- 

 piceous, trochanters and base of femora rufescent. Length, .36-. 40 

 in. = 9-10 mm. 



Habitat : New Hampshire, Alaska (Island of Kadjak). 



P. hudsonicus Lee. — Elongate, black, highly polished, thorax 

 subcordate, not wider than long, hind angles rectangular. Legs ob- 

 scurely ferruginous. Length, .28-. 38 in. = 7-9-5 mrn. 



Habitat: New Hampshire, Labrador. British Columbia, Alaska, 

 Lake Superior Region, Colorado TRed Cliff ). 



P. empetricola Dej. — Black, slightly bronzed or brownish 

 above, thorax cordate ; elytra oblong-ovate, finely striato-punctate, dor- 

 sal punctures four. Base of antennae and legs rufous. Length, .28 in. 

 = 7 mm. 



Habitat : New Hampshire, Hudson's Bay Territory, Alaska. 



P. mandibularis Kirby. — Black, above somewhat bronzed. 

 Legs and base of antennae reddish or brownish. Thorax cordate, hind 

 angles punctured. Elytral stride punctulate. Length, .25-. 28 in. = 

 6-7 mm. 



Habitat: New Hampshire, Massachusetts, Canada, Wisconsin^ 

 Hudson's Bay, Alaska. 



Evarthrus Lee. 

 Resembling P.erostichits, especially that group in which there is a 

 single dorsal puncture. Prosternum margined behind, elytra with one 

 dorsal puncture. Posterior tarsi not grooved externally ; labial palpi 

 with the last joint shorter than the penultimate which bears several 

 long setae in front. This last character separates it most readily from 

 Pterostichiis in which there are but two of these seta;. 



Synopsis of Species. 



Prothorax £iibi(uadi-ate, not constricted at base, prosternum deeply sulcate. 

 Elytral stria; strongly ])unctured. 



Margin of prothorax narrow, nearly uniform sigillatus. 



Margin of prothorax wide, especially at base seximpressus. 



Elytral strife finely purnctured. 



Prothorax wider than long, no true scutellar stria americanus. 



Prothorax as long as wide, scutellar stria rather long orbatus. 



Prothorax strongly constricted behind, posterior angles rectangular. 



Hind angles of prothorax very prominent COIOSSUS. 



Hind angles less prominent, shorter. 



Sides of prothorax much rounded sodalis. 



Sides of prothorax less rounded, more oblKjue furtivus. 



