.. "br, 
Igo? 
VII bg0 bt 
160 HETEROMERA. 
broad and extending from the base to the apex; the elytra unicolorous fusco-piceous, or with the suture 
or lateral margin very narrowly lighter. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith); Guatemaa, San Gerdnimo 
« 
(Champion). payed 
Var. 6. The prothorax with a very distinct smooth longitudinal median space and a bare impunctate spot on 
each side at the inner limit of the lateral marking. 
Hab. Mexico, Durango city (Hége), Etla, Yolos, Guanajuato (Sallé), Cuernavaca 
(Sailé, Hoge, H. H. Smith), Chilpancingo (Hoge, H. H. Smith), Oaxaca (Sallé, Hoge) ; 
GuaTeMALA, San Gerdnimo (Champion). 
Var. y.- The head and prothorax piceous, the elytra piceous-brown, the rest as in (. TR cal we 
Hab. Mexico, Guanajuato (Sallé). Two examples only. 
as Sul 
In the Sallé collection the typical form is labelled Nacerdes chevrolati, Dej.; the 
var. B, Oxacis sericea, Dugés; and the var. y, Oxacis concolor, Dugés. The typical 
‘form and the var. 6 are about equally common in Mexico; the var. « was collected in 
some numbers at San Gerdnimo, and one specimen of it has been received from Atoyac. 
The species is still more variable in Mexico and Guatemala than in the Southern 
United States. The antennz have the eleventh joint very strongly constricted at the 
middle in both sexes (apparently, but not really, twelve-jointed), and the third joint 
about as long as the first. Our specimens vary in length from 5-10 millimetres. We 
figure a male example of the var. 6, and another of the same sex of var. a, the former 
from Cuernavaca, and the latter from San Gerénimo. 
19. Oxacis plumbea. 
Very elongate, narrow, opaque, leaden-black (the elytra when denuded of pubescence with a violaceous tint in 
certain lights), thickly clothed with fine ashy pubescence. Head (including the epistoma and labrum) 
densely and finely punctured, the eyes not very coarsely granulated; antenne black, the first joint rather 
longer than the third, the eleventh strongly constricted at the middle; prothorax convex, longer than 
broad, the sides rounded anteriorly, constricted at the middle, and thence to the base subparallel, the disc 
canaliculate behind, the base and apex with prominent margin and slightly emarginate in the centre, the 
surface densely, very finely, and uniformly punctured; elytra scabrous-punctate, and without distinct 
raised lines; beneath densely and finely punctured, piceous; legs piceous, the tibie a little lighter in one 
example. 
Length (e; millim. 
Hab. Mexico, Chilpancingo in Guerrero (Hége). 
Two examples, apparently male and female. This insect is allied to, and of almost 
the same colour as, the var. y of 0. cana; but differs from it in the less coarsely 
granulated eyes and in the finer punctuation of the head and thorax, the pubescence 
on the latter still finer and less dense. The unicolorous plumbeous colour, elongate 
shape, and densely and very finely punctured surface distinguish this species from the 
other allied forms. 
