164 Mr. J. O. Westwood on 
acute, margine interno emarginato setoso, basi interné inciso. 
Mazxille lobis membranaceis setosis. Mentwm quadratum, 
lateribus rotundis. Palpi labiales breves, 3-articulati, in scapos 
crassos insidentes. Labiwm lobis duobus membranaceis ad 
basin articuli 2di palporum labialium productis. Tibie 
anticee extus serrate et 3-dentatee. Pronotum in ¢ anticé 
excavatum, in 9 verointegrum. Ungues tarsorum in ¢ intus 
in medio unidentati, in g simplices. (Insecta Americana.) 
The above characters will sufficiently characterize a small group 
of South American insects closely allied to and apparently repre- 
senting the old world Hybosori, with which, in various respects, it 
is true that they structurally agree ; but the form of the mandibles, 
and the sexual differences exhibited by the prothorax and ungues, 
will, I think, sufficiently distinguish them from that group. The 
type of the present genus is— 
Sp. 1. Hybosorus gibbus, Perty, (Mart. and Spix, Del. An. Art. 
Bras. pl. 9, fig. 5). 
(Pl. XI. fig. 3.) 
Syn. Hyb. Brasiliensis, Laporte, H. d. Ins. Col. ii. p. 108. 
Hyb. geminatus, Dej. Cat. ined. 
Brevis, convexus, supra niger, nitidus; elytris marginatis, sub 
lente geminato-punctato-striatis ; thorace ¢ anticé rotundato 
excavato, margine antico in medio tuberculo instructo ; capitis 
fronte carina media transversa seu potius tuberculis duobus 
conjunctis, transverse positis. 
Long. corp. lin. 3. 
Habitat in Brasilia. In Mus. Hope, Melly, nostr. 
Variat mas colore omnino luteo-fulvus. Habitat in Brasilia. 
Mus. Melly. 
Sp. 2. Coilodes Chilensis, W. 
C. piceus, thorace maris rufo-piceo, excavatione magna antica, 
margineque antico in medio tuberculo prominenti. 
Long. corp. lin. 33. 
Habitat in Chili. 
In Mus. Soc. Ent. Lond. 
Precedenti paullo major, magis piceus vel rufo-piceus, thorace 
magis impresso in parte magis antica. liter simillimus. 
