282 INSECTA. 



the tarsi are dentated beneath in the manner of a comb, and com- 

 mence with such as have their oval or ovoid head separated from 

 the thorax by a sudden and marked strangulation forming a sort of 

 knot or patella. The penultimate joint of their tarsi is always di- 

 vided down to its base into two lobes; the preceding ones are broad, 

 and in the form of a heart or reversed triangle. The first joint of 

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

 to the western world. 



Ctenodactyla, Dej. 



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

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

 cated posteriorly(l). 



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 

 ligula nearly cylindrical, without very distinct paraglossae(2). 



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

 gulation, in the form of a knot or patella(S). The joints of the tarsi 

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

 always flattened. The paraglossse 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, Jlnommus, Fisch. Tarus, Clairv. Ca- 



rabus, 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 4). 



(1) Ctenodactyla Chevrolatii, Dej. Spec. I, p. 227. [The only species known, 

 and type of the genus. From Cayenne. Am. Ed.] 



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

 d'Eur., and the Spec, des Coleop., Dej., 1. All the species belong to intratropical 

 America. 



(3) Somewhat narrowed posteriorly in Demetrias and Dromius, but not fixed to 

 the thorax by a patella. 



(4) See Hist. Nat. Col. d'Eur., fascic. II, and III, and Spec Gen. des Coleop. I. 



