242 LECONTE— SYNOPSIS OF PTEROSTICHUS. 



Feronia inorosa Dej. Sp. Gen. 3, 283. 

 Omaseus picicornis Kirby, Fauna Bor. Am. 4, 33. 

 Adelosia muta Loc. An. hyc. 4, 335 ; (synon. imperfecta). 

 Adelosia morosa Lee. ibid. 4, 335. 



Abundant throughout the Atlantic district. The thorax is sometimes a little 

 sinuate posteriorly, which causes the posterior angles to be a little prominent; it is on 

 an infinitesimal difference of this kind, that having mistaken Feronia carbonaria Dej. 

 I based my faulty sj/nonymy in the Annals of the Lyceum ; the posterior tibise of 

 the male are strongly pubescent internally. 



24. P. purpuratus, niger nitidus, tborace latitudine non brevioie, postice non angustato, lateribus 

 rotundatis, angulis posticis obtusis fere rotundatis, basi utrinque profunde striate, elytris aeneo-purpureis, 

 tripunetatis, striis profundis impunctatis, interstitiis convexis. Long. -53. 



This beautiful species, which approaches very closely to the preceding, was given 

 me by Dr. Schaum, who procured it in Ohio from Mr. Jenison. The posterior tibiae 

 of the male are still more densely pubescent internally than in the preceding species. 



25. P. erythropus, sub-ellipticus, nitidus, tborace rotundato-quadrato, antrorsum subangustato, 

 lateribus postice explanatis, basi subrotundato, utrinque striato, elytris tripunetatis, striis impunctatis, 

 7""^ antice obliterata, pcdibus ferrugineis. Long. -33. 



LeConte, Agassiz' Lake Superior, 206. 

 Feronia (^Aryutor) erythropus Dej. Sp. Gen. 2, 243. 

 Flatyderus nitidus Kirby, Fauna Bor. Am. 29. 

 Platyderus erythropus Lee. An. Lye. 4, 231. 



Found in every part of the Atlantic district. Although it differs from the other 

 species in having the base of the thorax immarginate, even at the sides, I have joined 

 it in the same group with them, to avoid multiplying the groups too much. A more 

 important difference is found in the absence of the scutellar stria, which is represented 

 by a single point. 



26. P. femoralis, apterus, thorace latitudine non breviore, postice subangustato, lateribus rotundato, 

 angulis posticis obtusis non rotundatis, basi utrinque profunde striato, elytris striis profundis punctulatis, 

 interstitiis subplanis, 3'° tripunctato, tibiis tarsisque rufo-piceis. Long. -28. 



Ai'ijiitor femoralis Kirby, Fauna Bor. Am. 4, 30. 



New York, one specimen; the three impressed points are smaller than usual. 



27. P. patruelis, elongatus, apterus, subcylindricus, thorace latitudine non breviore, postice suban- 

 gustato, lateribus modice rotundatis, angulis posticis non rotundatis, basi recto utrinque striato et 

 panctato, elytris striis impunctatis, profundis, interstitiis subplanis, 3'° tripunctato, pedibus piceis. 



• Long. -3. 



Lee. Agassiz' Lake Superior, 206. 

 Feronia patruelis Dej. Sp. Gen. 5, 759. 

 Argutor patruelis Lee. An. Lye. 4, 337. 



Middle and Western States and Lake Superior. This species, as well as P. 

 femoralis and P. mandibularis, is apterous. 



