244 JOHN L. LE CONTE, M. D. 



[I learn by a recent letter from Baron Chaudoir that this species, 

 from the vicinity of the Rocky Mountains, is not crihricoUis Dej. as 

 I formerly regarded it, but one thus far unnamed. Dejean's species is 

 identical with (J. marginata Kirby and reflexa Lee, and occurs in the 

 most northern part of the United States and in Canada.] 



3. Platynus rubripes Zimm. — Long. 3— 3i lin. Of the form of P. punctifor- 

 mis, but smaller, with large deep basal impressions of the prothorax, and yellow- 

 ferruginous legs. Shining black, smooth ; palpi and antennae testaceous, basal 

 joint of the latter yellowish-red. Prothorax almost as long as wide, with round- 

 ed hind-angles, near which the broad basal impressions are marked with a 

 small deep fovea. Elytra formed and sculptured as in P. puncti/or mis, hut na.r- 

 rower towards the base, so that the humeri are more angular, while in piincti- 

 formis they are rounded. 



This insect, omitted by LeConte in his Synopsis of Platyni, or per- 

 haps confused with puncti/ormis, must be properly received as a separ- 

 ate species. It occurs, but not frequently, in the region north of the 

 Potomac, while the species just named is very abundant in the South- 

 ern States. 



[The bad condition of the specimens in my collection prevented 

 me from describing this species as distinct, when I wrote the Syn- 

 opsis.] 

 4. Flatymis lenis, {Ag. lenum Dej.)^P. reiractus Lee. 



[The arrangement of the species of Platijnus for which, on account 

 of the confusion in the names previously used, Dr. Zimmermaun 

 proposed the name Psihpodius, seems so far superior in some respects 

 to that adopted by me, that although I have not had leisure to test it 

 by a re-examination of all my species, I think it well worthy of being 

 presented :] 



A. Prothorax cordate, or quadrate, with well defined hind angles j pubescence 



of antennae beginning on the 4th joint; 



a. All the joints of the tarsi without longitudinal grooves. — {oblongus of 



Europe.) 



b. Only the front tarsi, % 9. without grooves. — {Platynus Bon.) 



c. All the tarsi with grooves. — [Anchomenus Bon.) 



B. Prothorax rounded, or obtuse angled ; pubescence of antennae commencing 



with the 4th joint. — {Agonum Bon.) 



d. Prothorax broader than long, with depressed side margins which are 



reflexed behind. 



e. Prothorax broader than long, with narrowly beaded side margins. 



f. Prothorax small, elongate oval, with narrowly beaded side margins, 



C. (g.) Prothorax rounded, or elongate oval ; pubescence of the antennae begin- 



ning on the tip of the 3rd joint. — {Europhilus Chaud.) 



