LECONTE— SYNOPSIS OF PTEROSTICHUS. 239 



Man. Bull. Mosc. 1843, 201. 



Hypherpes amethi/stinus^Gha,\id. Bull. Mosc. 1838. 



Oregon. Resembles in form the preceding, the outer basal impression is almost 

 lost in the slight flattening of the lateral margin. 



15. P. planctus, thorace quadrato, postice vix angustato, lateribus subrotundatis et subsinuatis, basi 



utrinque striato, ad angulum striola levi, carinulaque impresso, elytris non latioribus, profunde striatis, 



interstitiis convexis. Long. '57. 



Oregon and Sacramento City, Mr. S. S. Rath von ; collected by J. Childs, Esq. 



This species is very similar to P. algidus, the thorax is wider, less rounded on the 



sides, and scarcely at all narrowed behind ; the outer basal impression is quite 



distinct. The humeri are denticulate and the elytra but little convex. 



These are two small species, closely related to the preceding, but having the 

 marginal line at the base of the thorax entire; the posterior angles are rectangular, 

 and sharp. The first joint of the abdomen is marked each side with a very distinct 

 transverse line, as in Evarthrus, while in all the preceding species there is nothing 

 of the kind to be seen ; the groove on the outer margin of the posterior tarsi is distinct 

 in the second species, but obsolete in the first. 



16. P. linearis, valde elongatus, subdepressus parallelus, thorace latitudine longiore, lateribus subro- 

 tundatis, postice angustato, basi utrinque striato, striolaque ad angulum impresso, elytris profunde 

 striatis, interstitiis convexis, pedibus rufo-piceis. Long. -3. 



One specimen, San Francisco. Piceous black, very narrow parallel and subde- 

 pressed. Head long, eyes not prominent. Thorax a little wider than the head, longer 

 than wide, very slightly rounded on the sides, scarcely at all narrowed behind, base 

 subsinuate very finely margined, transverse impressions slight, distinct; longitudinal 

 line nearly entire, basal impression linear short ; outer basal impression very short, 

 not deep, but distinct. Elytra not wider than the thorax, parallel, deeply striate, 

 interstitial spaces convex; marginal series of points widely interrupted. Feet 

 antennae and palpi rufo-piceous. This seems very close to Pterostichus angustus 

 (Man.,) but in Dejean's description there is no mention of the small basal line at the 

 posterior angle of the thorax, and the interstices of the elytra are said to be flat. 



17. P. longicollis, elongatus subcyiindricus, thorace convexiusculo latitudine fere longiore, lateribus 

 rotundatis, postice angustato, basi utrinque striato, eljtris striatis, interstitiis planis. Long. -33. 



Oregon, Mr. Wilcox ; it bears this name in the Berlin Museum. Piceous black, 

 elongate, subcylindrical. Head long, eyes not prominent, antennae longer than the 

 thorax. Thorax scarcely one-half wider than the head, a little longer than wide, 

 moderately convex, narrowed behind, rounded on the sides, which are very shortly 

 sinuate at the posterior angles, which are small and prominent ; transverse impres- 



