238 LECONTE— SYNOPSIS OF PTEROSTICHUS. 



have the dilated joints of the anterior tarsi broader than in the preceding group and 

 subtransverse ; the fourth and fifth joints are narrow. It corresponds with Chaudoir's 

 Brachystylus, and Hypherpes ; the last three species of this group have the groove 

 on the outer margin of the posterior tarsi distinct. 



10. P. subarcuatus, longlor, thorace latitudine fere longiore, lateribus late rotundato, postice 

 angustato vix sinuato, basi subrotundato, utrinque profunde striato, elytris \ix latioribus, profunde 

 striatis, postpectore abdominisque lateribus punctatis. Long. -5. 



New York, Mr. Guex. Extremely similar to P. adoxus, with which I for some 

 time confounded it. Besides the difference in the form of the base of the thorax, and 

 the marginal line behind the posterior angles, the large punctures of the pectus and 

 sides of the abdomen immediately distinguish this species. 



11. P. californicus, thorace latitudine subbreviore, lateribus late rotundatis, postice subangustato, 

 basi recte truncate, utrinque profunde striato, elytris non latioribus, striatis, subdeplanatis, interstitiis 

 externis paulo convexioribus, pectore sub-punctato. Long. -42 — -52. 



Mannerheim, Bull. Mosc. 1843, 199. 



Feronia (^Poecilus) californica Dej. Spec. Gen. 3, 223. 



Brachystylus californicus Chaud. Bull. Mosc. 1838, 17. 



Var. ? Pterostichus vicinus Man. Bull. Mosc. 1843, 206. 



Very abundant at San Francisco and San Jose, California. There appears to be 

 a slight variation in the form of the thorax and elytra, sufficient to account for 

 Pterostichus vicinus Man., but after a careful examination of a very large number 

 of specimens, I can seize on nothing tangible as a specific character. The humeri 

 are slightly toothed in this species. 



13. P. simplex, thorace latitudine subbreviore, quadrato, lateribus late rotundatis, postice vix angustato, 

 basi recto, utrinque profunde striato, elytris vix latioribus, subtilius striatis, interstitiis planis, post- 

 pectore parce punctato. Long. -58. 

 Lee. An. Lye. 5, 57. 



San Jose and Sta. Isabel, California ; very similar to the preceding, but differs in 

 having the thorax scarcely narrowed behind. 



13. P. algidus, thorace planiusculo, latitudine vix brcviore, lateribus late rotundatis, postice vix 



angustato, basi recto, utrinque profunde striato, ad angulum obsolete impresso, elytris vix latioribus, 

 profunde striatis, interstitiis convexis. Long. -56. 

 Oregon, Mr. Wilcox; given me as bearing this name in the Berlin Museum. 

 This may be Feroiiia valida Dej., but if so, the description makes no mention of 

 the external basal impression, which although small and shallow is quite distinct ; 

 this and the two next species have the thorax less convex than the species described 

 above. 



14. P. amethystinus, thorace quadrato, lateribus anterius late rotundatis, margine pone medium 



subexplanato, vix postice angustato, basi utrinque striato, arl angulum vix obsolete impresso, elytris pur- 

 purascentibus, vix latioribus, profunde striatis, interstitiis convexis, humeris denticulatis. Long. -4. 



