376 INSECTA. 



^he antennae is but slightly elongated. All the species known belong 

 to the western world. 



Ctenodacttla Dej, 



Exterior palpi filiform, the last joint oval ; body but slightly elon- 

 gated and flattened ; thorax almost cordiform, elongated, and trun- 

 cated posteriorly (a). 



Agra, Fab, 



Exterior maxillary palpi filiform ; labial palpi terminated by a 

 large triangular or securiform joint; the body long and narrow; tho- 

 rax forming an elongated cone narrowed anteriorly. The mentum 

 is suborbicular with a tooth in the middle of the emargination ; the 

 ligiila nearly cylindrical, without very distinct paraglossse *. 



Now the head is separated from the thorax by a very abrupt stran- 

 gulation, in the form of a knot or patella f- The joints of the tarsi 

 are entire in several, and the first are rarely dilated. The body is 

 always flattened. The paraglossae are never salient, simply forming 

 a membranous margin, rounded or obtuse at the end. 



Here the thorax is isometric, or longer than it is wide, cordiform, 

 and truncated posteriorly. The body is elongated. Such are 



Cymindis, Lat. — Cymindis, Anom(eus, Fisch. — Tarus, Clairv. 

 Carabus, Fab. 



Exterior maxillary palpi filiform, or hardly thicker at the extre- 

 mity, with the last joint cylindrical ; the same of the labials, larger, 

 almost securiform, or like a reversed triangle, at least in the males ; 

 the head not narrowed posteriorly ; all the joints of the tarsi entire 

 and nearly cylindrical %. 



Calleida, Dej. 



Entirely similar to Cymindis, Avith the exception of the tarsi, the 

 penultimate joint of which is bifid ; in the preceding it is triangular. 

 Peculiar to America. 



Demetrias, Bon. 



Analogous to Calleida in the tarsi, but having an oval head nar- 

 rowed posteriorly, and all the exterior palpi nearly filiform, with the 

 last joint almost ovoid or sub-cylindrical. 



This subgenus, as well as the next, is composed of very small 

 species, which usually frequent wet places. They are, nearly all, 

 European §. 



* See Kliig's excellent Monograph of this genus : also the Hist. Nat. Col. 

 d'Eur., and the Spec, des Coleop., Dej., I. All the species belong to intratropical 

 America. 



t Somewhat narrowed posteriorly in Demetrias and Dromius, but not fixed to the 

 thorax by a patella. 



J See Hist. Nat. Col. d'Eur., fascic. II, and III, and Seec. Gen. des Coleop. I. 



§ See op, cit. 



{j:^(a) Ctenodaclyla Chevrolatii, Dej. Spec. I, p. 227. The only species known 

 and type of the genus. From Caynne. — Eng. Ed. 



