NATURAL SCIENCES OP PHILADELPHIA. 311 



Larger, hind angles of prothorax rectangular, small, and not prominent ; 



83. subcauddtus Mann. 



Middle sized, hind angles of prothorax rather prominent, a. Hind angles 

 somewhat less prominent ; frigidus. 84. empetricola Dej. 



Smaller, prothorax broader, comparatively more narrowed behind, sides 

 suddenly sinuate, hind angles prominent ; fasiidiosus Mann., ochoticus 

 Sahib. 85. mandibularis Kirby. 



NEW SPECIES. 



2. P. TARSALis, elongate, very depressed, parallel, black shining ; 

 prothorax quadrate, a little wider than long, feebly narrowed be. 

 hind, front angles acute, apex broadly but deeply emarginate, base 

 subsinuate, margined near the angles, which are rectangular and 

 not carinate, basal impressions feeble, double, the outer one shorter ; 

 elytra rather broadly margined, feebly sinuate towards the tip ; 

 humeri dentiform, stripe fine but deep, impunctured, scutellar not 

 XQvy long, between first and second strire ; posterior tarsi rather 

 stout, joints triangular, not grooved on the other side. Long. 

 16.5-19 mm. 



Lake Taho "Valley, Sierra Nevada. This species has the form 

 and sculpture of P. plancfus Lee, but is easily known by the 

 labrum and epistoma being broadly emarginate, as in P. morio- 

 nides Chaud., and by the tarsi being much stouter, and not 

 grooved on the outer side. The prosternum is finely margined 

 between the coxae ; the sides of the trunk are finely not deeply 

 punctured ; as in other Pterostichi, the last ventral segment of 

 the 9 is marked with two setigerous punctures, and of the % with 

 but one ; in the latter sex there is also a feeble subapical concavity 

 which is wider than long. 



3. P. CRENicoLLis, elongate, black, elytra with a feeble purplish 

 lustre (rather dull in the 9 ), prothorax quadrate, scarcely wider 

 than long, feebly narrowed behind, rather depressed, front angles 

 rounded at tip, tip broadly emarginate, base nearly straight, mar- 

 gined near the angles which are rectangular, but not sharp, broadly 

 and feebly subcarinated, basal impressions double, the outer one 

 shorter, sides narrowly margined, and distinctly crenate at the 

 edge ; elytra broadly rounded on the sides, distinctly sinuate near 

 the tip, humeri dentiform, striae deep impunctured, scutellar short, 



