ClCINDELID^E AND CARABID^E 131 



Rejectus is well distinguished from adoxus by its more elongate 

 form, elongate elytra and larger pro thorax, having the basal angles 

 blunt though to a varying degree; it is principally distinct, however, 

 in the very different scutellar stria, as described above. Zephyrus 

 is widely distinct from any of the others in the large and deep ante- 

 angular sinus at the sides of the prothorax and the very acute and 

 laterally prominent angles, as well as the still shorter elytra, with 

 feebly crenulate striae, smaller head and general habitus. Tetricula 

 is allied to adoxus rather closely, but may be distinguished at once 

 by the narrower and more elongate outline, more posteriorly 

 narrowed prothorax and longer elytra. As to sustentus and sub- 

 arcuatus, of LeConte, I am unwilling to express an opinion in the 

 absence of the types. A note which I made on viewing the type of 

 sustentus, states that it is not zephyrus, the thoracic sides being 

 much more strongly sinuate basally in the latter, and that sustentus 

 is a valid species; its habitus must therefore be visibly different 

 from that of adoxus. One female from an unrecorded locality 

 before me is much stouter than any other example of adoxus, but 

 does not seem to differ much otherwise, except in the obtuse and 

 blunt basal thoracic angles; its dimensions are 12.8 by 5.0 mm. 



The more systematic part of the present study of Pterostichus 

 ends here, but allusion will be made to some other groups as follows: 



Diligendus group. 



This group begins a long series of Pterostichids having dorsal 

 foveiform punctures on the elytra and they are more essentially 

 peculiar to the Atlantic faunal regions; here there is but a single 

 puncture on each elytron, situated behind the middle near the third 

 stria, or between the second and third. Heretofore the group has 

 been considered purely Atlantic in range, but the following species 

 shows that it extends to the Pacific coast : 



Pterostichus wrangelli n. sp. Subparallel, moderately convex, shining, 

 black, the elytra, under surface and legs with a piceous tinge, the tro- 

 chanters and tarsi paler; head rather small, the impressions moderate, 

 arcuately diverging, the eyes convex; labrum rectilinearly truncate; 

 antennae testaceous throughout; prothorax about a sixth wider than long, 

 the sides rounded, converging posteriorly, becoming broadly though 

 very distinctly sinuate toward the angles, which are right, very sharp 

 and somewhat prominent or subeverted; base feebly sinuate medially, 

 margined laterally, nearly five-sixths the maximum width, the apex feebly 



