88 RHYNCHOPHORA. 
or less longitudinal in the greatest diameter when lobes are present, and transverse 
when they are absent. 
It includes two minor groups that it is unnecessary to distinguish here by names, viz.: 
I. Rostrum with scrobes that are very deep and definite, even at their termination. Genera 
Ophryastes, Tosastes, Caccophryastes, and Eupagoderes. 
II. Rostrum with scrobes that are extremely broad and quite indefinite behind. Genus 
Amphidees. 
The genera of the first subgroup may be readily distinguished as follows :— 
A. Tarsi without pubescence on the third joint. 
1. Corbels of the posterior tibize more or less imperfectly cavernous . Ophryastes. 
2. Corbels of the posterior tibize with laminate tip bearing only one 
series of spinules externally (‘open corbels,” Lacord.) . . . . Tosastes. 
B. Tarsi with adhesive pubescence on the lobes of the third joint. 
1. Mentum concealing the palpi entirely . . . . . . . . . . Eupagoderes. 
2. Palpi projecting beyond the apex of the mentum . . . . . . Caccophryastes. 
OPHRYASTES. 
Ophryastes (part.), Schénh. Gen. Cure. i. p. 508 (1833). 
Dystirus, Pascoe, Journ. Linn. Soc., Zool. xi. p. 447. 
Ophryastes, Leconte & Horn, Rhynchophora of N. Am. p. 30. 
Although this genus cannot be defined by means of the tuberosities at the side of 
the thorax, yet it may be satisfactorily separated from EHupagoderes by the absence of 
adhesive pubescence from the lobes of the third tarsal joint. The tips of the hind tibie 
are cavernous, as stated by Lacordaire, though in an imperfect and variable manner. 
Ophryastes is peculiar to the arid regions of the Southern United States and Northern 
Mexico. The species are no doubt epigeal in habits, though I have not seen any records 
to this effect. 
A very interesting North-American form may be at present placed in the genus, 
though, no doubt, it will have to be ultimately separated *. 
* Ophryastes wickhami, sp. n. 
Griseus, dense squamosus, breviter hispidus ; rostro trisulcato, basi depresso; prothorace transverso, rugoso, ad 
latera perparum incrassato; elytris subsulcatis, sulcis obsolete punctatis. 
Long. cum rostro 19 millim. 
Hab. Norra Amurica, Winslow, Arizona ( Wickham). 
I name this species in honour of Mr. H. F. Wickham, to whom I am indebted for a considerable part of the 
specimens that have enabled me to form some idea of the N.-American Ophryastini. The feet of O. wickhami 
are rather broad, but have no horny projections beneath, these being replaced by membranous processes (formed 
apparently by agglutinated cilie) coming from the side-margins of the joints; the tips of the hind tibie are 
distinctly truncate, and the truncature is entirely filled by long cilis or scales, part of them directed inwards, 
part outwards, but there are no marginal cilie. Mr. Wickham thought the species might be referable to 0. 
desertus, Lec., but this is clearly not the case. 
