1854.] 43 



Lake Superior agrees perfectly with this species, except that the legs are entirely 

 of a dark testaceous yellow. From the next this species is distinguished by the 

 lateral margin of the thorax being as wide anteriorly as towards the base, and 

 more strongly reflexed. 



7. P. cincticollis, niger, nitidus, thorace latitiuline breviore, postice an- 

 gustato, lateribus rotundatis, postice subsinuatis, margine piceo reflexo, postice 

 latiore, elytris tenuiter striatis, tripunctatis, antennis pedibusque piceis, vel 

 piceo-testaceis. Long. *37 *45. 



Feronia cincticollis Say, Trans. Am. Phil. Soc. 2, 52. 



Ancho menus cincticollis Say, ibid 4, 421. 



Platynus blandu.i Germ. Ins. Nov. 12. 



Anchomenus corvinus Dej. Sp. Gen. 3, 102. Lee, Ann. Lye. 4, 221. 



Anchomenus deplanatus Chaud. Bull. Mosc. 1S43, 763. Lee. Ann. Lye. 4, 221. 



Anchomenus marginalia Hald. Proc. Acad. Nat. Sc. 1, 299. 



Middle and Southern States ; common. The last two synonyms belong to a < 

 variety in which the interstices of the elytra, instead of being slightly convex as 

 usual, are entirely flat ; there are, however, no other differences of a definite 

 character, and I see no reason why they should be retained as distinct. The 

 brevity of Mr. Haldeman's description will make it doubtful whether this or 

 the preceding species was meant, but a typical specimen kindly furnished me by 

 'him evidently belongs to the present species. 



Dr. Harris possesses a specimen of this species, which was named Feronia 

 maculifrons, by Mr. Say; with the description (Journ. Acad. Nat. Sc. vol.3, p. 

 146) of that species it does not agree. 



B b. 



Containing two winged species from California, closely allied to those of the 

 preceding division, but of a somewhat less slender form, and with filiform an- 

 tennae. The thorax is strongly margined, slightly narrowed towards the base, 

 with the posterior angls obtuse, not rounded, and slightly prominent; the pos- 

 terior transverse impression is deep, and the basal impressions shallow ; the 

 elytra are twice as wide as the thorax, truncate at base, with the humeral angles 

 rounded ; they are finely margined and very slightly sinuate towards the tip; the 

 strise are fine, the interstices slightly convex, and the third has frequently four 

 impressed punctures, which, however, seem liable to considerable variation ; 

 the normal number appears to be three. 



8. P. b i c o 1 o r, piceo-rufus, nitidus, thorace latitudine vix breviore, postice 

 subangustato, lateribus rotundatis, postice sinuatis, margine fortius reflexo, basi 

 truncata, angulis posticis rectis prominulis, elytris piceis, thorace duplo latiori- 

 bus, striis tennibus, interstitiis vix convexis, margine rufo-piceo. Long. '43. 



San Diego, California. The lateral margin of the thorax is moderately wide 

 and not dilated posteriorly ; the basal impressions are marked with a short im- 

 pressed line at the bottom. Apart from color this species is distinguished from 

 the next by the narrower thorax and more slender form. 



9. P. c i n c t e 1 1 u s, niger, nitidus, thorace latitudine breviore, postice paulo 

 anirustato, lateribus rotundatis postice sinuatis, margine fortius reflexo, diaphano, 

 basi truncata, angulis posticis prominulis rectis, elytris thorace fere duplo lati- 

 oribus, striis tenuibus, interstitiis vix convexis, margine saepe tenuiter piceo. 

 Long. *42. 



San Francisco, California ; very abundant. Specimens occur with three, four, 

 and even five punctures on the third interstice of the elytra ; the impressed lines 

 of the basal impressions of the thorax are less distinct than in the preceding ; 

 the antennae and palpi are nearly black ? the tarsi are sometimes dark piceous. 



I have distributed this insect under the name Anch. brunneo-marginatus (Mann. 

 Bull. Mosc. 1843, 196,) but on reconsidering the matter, I find so many points 

 of disagreement, that 1 am obliged to propose a new name. His description reads : 



"Apterus, niger, depressus, capite laevissimo inter antennas impresso, thorace 

 longiore, subcordato, lateribus refiexo-marginatis, angulis posticis acutiusculis, 



