508 SEKRICOENIA. 



our limits. The two now added differ considerably from the known forms, one being 

 almost glabrous, and the other having an excavate front. These insects are found in 

 rotten wood or under bark. 



a. Front flattened or feebly convex. 



a'. Body moderately convex ; punctuation close, that of the prothorax coarse, 

 a". Body brown or brownish-black; pubescence fulvo- or flavo-cinereous, 

 conspicuous. 

 a'". Prothorax as long as broad, the sides subparallel at their median third 



in both sexes infuscatus. 



b'". Prothorax broader than long, trapezoidal in the male, rounded at the 



sides in the female piceus. 



b". Body black; pubescence very sparse and partaking of the ground-colour; 



prothorax trapezoidal in the male, rounded at the sides in the female . . corvinus. 

 b'. Body flattened above, almost glabrous, deep black, highly polished, and very 



sparsely, minutely punctate glabratus. 



b. Front concave ; body moderately convex, brownish-castaneous or blackish-brown ; 



pubescence fulvo- or yellowish-cinereous, conspicuous. 



c' . Antennae serrate in the male cavifrons. 



d '. Antennse pectinate in the male pectinicornis. 



l. Orthostethus infuscatus. 



Aphanobius infuscatus, Germ. Zeitschr. fur Ent. v. p. 183 1 ; Lee. Trans. Am. Phil. Soc. new ser. x. 



p. 492 \ 

 Orthostethus infuscatus, Lacord. Gen. Col. iv. p. 207 3 ; Cand. Monogr. Elat. iv. p. 314 4 . 

 Pristilophus sordidus, Melsh. Proc. Acad. Phil. ii. p. 216 \ 

 $ . Orthostethus prafectus , Cand. Monogr. Elat. iv. p. 315 6 . 



Hab. North America 1 , Southern States 2 4 , Alabama 5 . — Mexico 1 4 , Cordova, Tuxtla, 

 Santecomapan (Salle) ; British Honduras (coll. Jansori) ; Guatemala, San Juan in 

 Vera Paz, El Tumbador, Las Mercedes, San Isidro, Volcan de Atitlan, Zapote 

 (Champion), El Eincon in San Marcos (Richardson), Panzos, Escuintla (Conradt) ; 

 Nicaragua, Chontales (Belt, E. M. Janson); Panama, Bugaba, Volcan de Chiriqui 

 (Champion). — South America, Brazil 6 . 



Widely distributed in Tropical America, extending northwards into the Southern 

 United States. 0. prwfectus, of which I have four specimens before me (three 

 determined by Candeze himself), is based upon large females of this species, the 

 Brazilian examples being inseparable from others of the same size and sex from North 

 America. The thorax is as long as broad in both sexes, with the sides subparallel in 

 the male, more rounded anteriorly in the female. 



