178 RHYNCHOPHORA. 
armed with numerous short sete. Under surface bearing numerous short sete ; 
terminal ventral plate with a large deep fovea. 
We have received only one specimen from each locality: the individual from 
Tehuacan is covered with an incrustation of dirt, and appears to be rather more 
elongate in form, so that possibly it may represent a second species. 
Series OTIORHYNCHINA ALATA*. 
The characters for this Series of the Otiorhynchine are given on p. 87, anted, and 
are much the same as those used by Horn for his Division II. of the N.-American 
forms. The term “ Alate” unfortunately proves to be misleading, as we now know 
that the wings are sometimes rudimentary even in a series of specimens of certain 
species, é.g. in Tanymecus confertus, Gyll. (= variabilis, Fahr.), from the same 
locality, and one or two other genera also include both apterous and winged forms. 
It is proposed here to divide the species of the present series into two sections: one 
without definite ocular lobes to the prothorax +, the other with the lobes large and 
rounded. The first section, again, is subdivided, according to the presence { or absence 
of vibrisse, the condition of the tarsal claws (connate or free), the position of the 
scrobes and eyes, the lamination or otherwise of the apex of the posterior tibize (closed 
or open corbels), &c. Horn’s groups [tribes] “ Tanymecini,” ‘“* Exophthalmini,” and 
‘* Promecopini” are practically accepted, the last-named corresponding to our 
Section II.; but his “ Cyphini,” with the much larger number of genera represented 
in our region, and “ Phyllobiini ” require different treatment. 
Section I.—Ocular lobes wanting or rudimentary. 
Group TANYMECINA. 
This group is equivalent to Horn’s Tribe “'Tanymecini,” and it includes two genera 
in addition to those belonging to the N.-American fauna. Polydacrys is said by him 
to have “very distinct vibrisse composed of scales,” but these longer scales seem to 
me to be part of the general vestiture and not true vibrisse ; this genus, moreover, 
cannot be satisfactorily placed in a different group from its close ally, Anypotactus, 
in which the vibrissiform scales are wanting. The tarsal claws are free, except in 
the anomalous genus Jsodrusus, which forms a connecting-link with the Polydrosina. 
The essential characters of the Tanymecina, therefore, are the presence of setiform 
vibrissee and the laterally placed scrobes. 
* By G. C. Campton. 
t+ In Pachneus and Diaprepes there is sometimes an indication of a short lobe, as in Pandeleteius and 
Hadromerus. 
+ Apparently wanting or replaced by scales in one or two of the smaller species of Pandeleteius of the 
“ Tanymecina.” 
