COLEOPTERA. 291 



labial palpi terminating by a larger and almost securiform or trian- 

 gular joint; thighs and tibiae narrow and elongated(l). 



The others have an oval or oblong body, and the thorax either 

 nearly in the shape of a cup or heart, or almost orbicular; the an- 

 tennae are filiform, and consist mostly of cylindrical joints, the last 

 particularly; the others narrowed at base and nearly in the form of 

 a reversed cone; the last joint of the exterior palpi is almost oval 

 or fusiform. The labrum is emarginate. 



They are peculiar to the hot and sandy districts of the western 

 countries of the eastern continent. 



DiTOMus, Bon. — Carahus^ 'Calosoma, Scaiirus, Fab. 



Palpi shorter than the head; thorax cordiform, or like a cup; 

 tarsi short. 



Some species, those to which Ziegler has restored the generic ap- 

 pellation of Ditomiis, have a more elongated body of equal width; 

 the head separated from each side of the thorax by a re-entering an- 

 gle, and usually armed, in the males, witli one or two horns(2). 



The others, or those which compose the genus Aristus, Zieg., have 

 the body shorter, and wider before; the head almost continuous with 

 the thorax, and buried in it up to the eyes; its anterior angles are 

 pointed(3). 



Apotomus, HofF.— iS'cari^e*, Ross. 



The anterior palpi very long; thorax orbicular; tarsi filiform and 

 elongated; exterior maxillary palpi much longer than the head, and 

 terminated by an ovoido-cylindrical joint; the same joint of those 

 of the labium elongated and fusiform. I have not perceived a tooth 

 in the emargination of the mentum(4). 



3. Our third section of the Carabici, that of the Quadrimani, — 



(1) Ozxna dentipes, Oliv., Encyclop. Method.; — Ozmna Rogerii, Dej., Spec. p. 

 434; — Ozmna hrunnea. Id., lb.; — Ozasna Gyllhenalii, Id. lb. 



(2) Dejean, Spec. I, p. 439, first division of Ditomus. The Carabus calydonius 

 of Fabrlcius, according to a label affixed by him to a specimen taken from the 

 collection of M. Desfontaines, forms a species very distinct from the Bitomtis 

 calydonius of Dejean. The mandibles of the male are forked or divided as it 

 were into two horns; the middle horn terminates in a point or rather is hastate at 

 the extremity. The Calosoma hngicornis of Fabricius is probably the female of 

 this species or of another that is closely allied to it. 



(3) Second division of Ditomus of Count Dejean, lb., p. 444. 



(4) Scarites rufus, Oliv., Col. Ill, 36, 11, 13, a, b; itossi, Faun. Etrusc. I, iv, 3; 

 Apotomus rufus, Dej., Spec. I, p. 450; — Apotomus teslactus. Id. , lb., p. 451. 



