ARRHENOPLITA. | 177 
These specimens from Chontales are equal in size to the smallest individuals of the 
variable and allied A. armata, Lap. and Brullé, of South America. The head in the 
male is armed with two short, stout, conical horns, the vertex deeply but not broadly 
excavate in the middle, the epistoma swollen and with a minute prominence on each 
side on the anterior margin, the surface finely and sparingly punctured ; in the female 
more closely and more coarsely punctured, more deeply excavate anteriorly, the intra- 
ocular space a little raised and swollen on each side and shallowly impressed in the 
middle. The prothorax and elytra are formed much as in A. armata, the elytra (the 
interstices especially) are, however, rather more finely punctured. Compared with 
A. armata the head in the female is more sparingly punctured, the intraocular space 
flatter in the middle and with a distinct shallow fovea in the centre; the male with 
much shorter horns, the epistoma more swollen, the excavation on the vertex smaller. 
5. Arrhenoplita lecontii. 
Evoplus lecontii, F. Bates, Ent. Monthly Mag. ix. p. 233 (3). 
Hab. Mexico, Cordova (Sallé)—Cotoms1a }. 
Both sexes of this species were found by M. Sallé. In the single female example 
the head is broadly transversely excavate, the intraocular space transversely raised 
(terminating in a rounded prominence on each side), the epistoma swollen and sharply 
defined ; the thorax narrower and less transverse than in the male. Compared with 
the type, a male, of A. lecontit, the Mexican example of the same sex has the cephalic 
horns rather longer and more curved towards the apex. Mexican examples are of a 
lighter castaneous colour than the Colombian type. 
6. Arrhenoplita lutea. 
Hoplocephala lutea, Chevr. Compt. Rendus de la Soc. Ent. Belg. xxi. p. xevil. 
Hab. Mexico, Esperanza, Jalapa (Hége).— VENEZUELA". 
Examples of both sexes of a species of this genus, sent by Herr Hoge from Mexico, 
agree very nearly with the description of A. Zutea. The head in the male has two short 
conical tubercles (sometimes connected by a feeble sinuous transverse elevation), and 
the epistoma swollen and with scarcely any indication of a prominence on each side on 
the anterior margin; in both sexes the head in front is deeply semicircularly excavate ; 
the thorax in the male is scarcely broader than in the female, and (as usual) the sides 
are more rounded and a little constricted just before the base. Compared with the 
same sex of A. castanea, F. Bates, from Colombia, the male may be readily known by 
the different structure of the head; the head, indeed, of the male of the Mexican insect 
‘somewhat resembling the female of A. castanea, but with stronger tubercles between 
the eyes, and without fovea in the middle. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, June 1886. 9AA 
