LECONTE— SYNOPSIS OF PTEROSTICHUS. 253 



Georgia; one specimen. The form of the thorax and the smaller size distinguish 

 this species from L. velox. The external joints of the antennae in this and the last 

 species are but little darker than the basal ones. 



10. L. crenatus, thorace latitudine subbreviore, linea transversa nulla, utrinque subangustato, lateribus 

 rotundatis, angulis posticis obtusis minime rotundatis, basi vix parce punctato utrinque striate*, elytris 

 striis crenatis, antennis palpis pedibusque testaceis. Long. *23. 



One male ; Georgia. Very distinct by the absence of the anterior transverse line 

 of the thorax, and the coarse punctures of the elytral striae, which are smooth only 

 towards the apex. The apex of the elytra, the epipleurae and the abdomen, are 

 piceous, but the specimen is probably a little immature ; the iridescent reflections of 

 the upper surface are very brilliant. 



PGECILUS Bon. 



Antennae tenues, articulis 1 — 3 acute carinatis; palpi cylindrici, articulo ultimo vix breviore ; mentum 

 dente medio concavo, emarginato; ligula subplana, apice truncata, paraglossis earn paulo superantibus ; 

 labrum vix emarginatum ; mandibulse breves ; parapleurse subelongatse ; elytra punetis dorsalibus, striaque 

 scutellari notata; tarsi tenues, posteriores extus sulcati; antici maris articulis 3 obcordatis, duobus primis 

 emarginatis. 



The carina on the basal joints of the antennae easily distinguish this genus; the 

 posterior tibiae are very spinous, as in Loxandrus, but the fourth joint of the tarsi is 

 not so small, so that the last joint is only as long as the two preceding. 



We may arrange the species as follows : 



a. Thoracis margine laterali non depresso, ....... Sp. 1 — 6. 



b. Thoracis margine late depresso, ........ Sp. 7 — 9. 



a. 



1. P. subcordatus, elongato-oblongus, depressus supra viridis, thorace postice angustato, lateribus 



rotundatis postice subsinuatis, angulis posticis rectis, impressione basali externa brevissima obsoleta, 

 elytris tripunctatis, striis internis punctatis, pectore lsevi, antennis rufis. Long. -4 — *5. 

 Lee. An. Lye. 5, 37. 



Colorado and Gila rivers. Very similar in form to P. occidentalis, but the smooth 

 pectus and the three^dorsal punctures at once distinguish it. The thorax is usually 

 not wider than long, yet I have three specimens in which it is decidedly transverse. 

 The punctures of the internal striae of the elytra are sometimes indistinct. 



2. P. occidentalis, elongato-oblongus, depressus, supra viridis, thorace postice angustato, lateribus 



rotundatis, basi subsinuatis, angulis posticis rectis, impressione basali exteriore brevissima fere obsoleta, 

 elytris tenuiter striatis, bipunctatis, interstitiis planis, antennarum basi rufo-picea, pectore punctato. 

 Long. -38—45. 



fFeronia (Pcecilus) occidentalis Dej. Sp. Gen. 3, 231. 



? Pterostichus occidentalis Man. Bull. Mosc. 1843, 200. 



Very abundant at San Jose, under bark of trees. Varies with the body, above 

 brassy copper, never very shining. The striae of the elytra are sometimes very 



64 



