250 LECONTE— SYNOPSIS OF PTEROSTICHUS. 



joint deeply emarginate ; intermediate and posterior tibiseof the male obtusely serrate 

 along nearly the whole of the internal margin. The body is elongate, moderately 

 slender, depressed and apterous. 



1. H. a t e r , subnitidus thorace latitudine vix breviore, lateribus subrotundatis postice crcnatis et subsinu- 

 atis, elytris tenuiter striato-punctatis, interstitiis subplanis, humeris denticulatis. Long. 1-0 — 1-15. 

 Feronia [Pterustlcus) atra Dej. Sp. Gen. 3, 339. 

 Feronia (^Percus) lama Menetries, Bull. Acad. Petrop. 2, 59. 



Sacramento, Mr. Rathvon; collected by Mr. Joshua Childs. The male has a 

 carina on the last ventral segment, extending from the tip forwards and ending in 

 an acute elevated dentiform tubercle, just as described by Dejean. 



The Russian Entomologist Motschoulsky (Bull. Mosc. 1845) says that the 

 Pterostichus ater Man. and Menetries is a very different species belonging to 

 Chaudoir's group Brachystylus. Mannerheim's description is so short as to be obscure. 

 Ey a recent manuscript catalogue of Baron Chaudoir, I see that he proposes to 

 call this second large species, which is left without a name, Brachystylus 

 m e g a s . 



LOXANDRUS Lee. 

 MEGALOSTYLUS\\ChQ.Md.o\r. 



Antennse tenues, basi non carinatas ; palpi cylindrici tenues, articulo ultimo vix brevicre; mentum dente 

 medio obtuso vix concavo, ligula subplana, apice truncata, paraglossia linearibus multo longioribus ; labrum 

 non emarginatum ; mandibulce breves ; paiapleuise elongatse ; elytra puncto dorsali unico, stria scutellari 

 nulla impressa ; tarsi tenues, posteriores extus sulcati, antici maris articulis tribus dilatatis intus prolongatis, 

 valde obliquis. 



This genus seems peculiar to Eastern North America ; besides the characters given 

 above, the pubescence of the antennse is deaser and more equally diffused than in 

 the preceding genera ; the parapleurse are more strongly margined, and the spines 

 of the posterior tibiae are stouter and more rigid; in the posterior tarsi the fourth 

 joint is very small, and the last joint is as long as the three preceding united. The 

 body is oblong, depressed and winged; the color is very brilliant black, with 

 iridescent reflections ; the thorax is subtransverse, scarcely or not at all narrowed 

 behind, rounded on the sides, with the basal impressions single, linear and straight; 

 the anterior transverse line is strongly impressed ; the margin of the elytra is very 

 narrow, the marginal or ninth stria is lost in the concavity of the margin, and is 

 distant from the ocellate punctures ; the posterior tibiae of the males are slightly bent 

 inwards. 



