194 CLASS INSECTA. 



culation of the tarsi is always divided up to its base into 

 two lobes ; the preceding are large, heart-shaped, or like a 

 reversed triangle. The first articulation of the antennae is 

 but little elongated. All the known species are from the 

 new continent. 



Ctenodactyla, Dej. 



Their exterior palpi are filiformed, with the last articulation 

 ovaliform. The body is but little elongated, flat, with the 

 corslet nearly in form of an elongated heart truncated be- 

 hind.* 



Agra, Fabr. 



The exterior maxillary palpi are filiform^ and the labial are 

 terminated by an enlarged articulation securiform or tri- 

 angular. The body is long and narrow, with the corslet 

 formed like an elongated cone narrowed before. 



The chin is suborbicular, with a tooth in the middle of the 

 emargination The ligula is nearly cylindrical, without dis- 

 tinct paraglossae.-f- 



Nevertheless, the head is not distinct from the corslet by 

 a sudden termination, formed like a knot or ball;:|: the arti- 

 culations of the tarsi are entire in many, and the first are but 

 seldom dilated. The body is always flat. The paraglossae 

 are never prominent, and form merely a membranous margin, 

 round or obtuse at the end. 



* Ctenodactyla Chevrolatn, Dej. Spec. I. 227. of Cayenne. 



t See the excellent monograph of this genus published by Dr. Klug, 

 in the second fasciculus de I'Hist Nat. des Coleopt. d'Eur., and the first 

 vol. of the Spec. Gener. of the Count Dejean. All the species are of the 

 intertropical America. 



\ Slightly drawn back posteriorly in the Demetrias and the Dromias, 

 but not fixed to the corselet by a ball. 



