138 PHYTOPHAGA.—SUPPLEMENT. 
P. bajulus being evidently a very variable species, I have ventured to refer all the 
specimens from the above localities to it,.more especially as they have most of the 
principal characters in common. The thorax has a semiangular (not rounded) lateral 
margin and a closely punctured surface, the punctures interrupted by small yellow 
spots which often form themselves into two more or less distinct yellow lateral stripes 
and a shorter central one. The elytral sculpture it is almost impossible to describe, 
scarcely two specimens being alike in this respect, and in some cases one elytron is 
differently punctured to the other; as a rule, however, the entire lateral portion is 
impressed with black semiregular rows of punctures, and between these short yellow 
spots and stripes are visible, amongst which a small raised spot is particularly promi- 
nent near the suture at the middle. The underside and legs are generally black. The 
pygidium has four yellow spots, and the last abdominal segment is entirely of that 
colour. Specimens occur in which the black punctures and lines of the upper surface 
are replaced by brown. 
6 (4). Pachybrachys minutus. (Tab. XXXIX. fig. 2.) 
Black; thorax closely punctured, flavous, with three broad black bands, the middle one divided anteriorly ; 
elytra flavous, this colour interrupted by deep black punctured irregular strie; pygidium black, with 
four yellow spots; underside and legs black, the last abdominal segment and the femora spotted with 
white. 
Length 2-1 line. 
Hab. Mexico, Chilpancingo in Guerrero (H. H. Smith). 
This very small species, of which several specimens were obtained, seems to be most 
nearly allied to P. bajulus; it differs from it, however, in the entirely black antenne, 
the differently-marked thorax, different sculpture of the elytra, and the much smaller 
general size. The head is black, very closely punctured, and has six bright flavous 
spots, of which two, obliquely shaped, are placed on the vertex, two in front of the 
eyes, and two others within their emargination; the lower portion of the epistome is 
also more or less flavous. The antenne extend to about two-thirds the length of the 
elytra, and are black, with the exception of the lower joints, which are slightly tinged 
with piceous beneath. The thorax is rather closely and strongly punctured, with evenly 
rounded sides, and the bright flavous ground-colour is divided by a black band at the 
sides, including a small yellow spot, and a central band divided anteriorly by a narrow 
flavous stripe; the basal margin has a narrow flavous stripe in front of the scutellum, 
the latter being entirely black. The elytra seem to differ from those of P. bajulus in 
having more yellow longitudinal raised interspaces, which are even visible at the base 
between the shoulder and the scutellum; the deep black punctured strize interrupt in 
many places the yellow portion, dividing it into unequal stripes, and they often unite to 
form spots near the apex and at the sides. The underside is entirely black, with the 
exception of a yellow spot at the sides of the last abdominal segment. The legs do not 
