PACHYBRACHYS. 141 
8 (a). Pachybrachys forreri. (Tab. XX XVIII. fig. 24.) 
Black; thorax very closely punctured, the sides, and three spots placed triangularly, yellowish-brown; elytra 
closely punctured, the posterior portion costate, the base and the apex, and two spots placed transversely 
at the middle, yellowish. 
Length 13 line. 
Head very closely punctured, black, a narrow margin surrounding the eyes, a spot at the middle, and the 
labrum, dark yellow ; antenne more than two-thirds the length of the body in the male, black, the lower 
five joints fulvons: thorax rather convex, with strongly rounded sides, extremely closely punctured, the 
interspaces here and there rugose, with a more or less distinct central longitudinal raised line, the surface 
black, with the lateral margins broadly, part of the anterior margin, the raised middle line (sometimes 
widened into a triangular space), and two small spots at the sides, dark yellow; scutellum with a few 
punctures, black, its apex truncate; elytra with deep and very closely arranged punctures, the interstices 
in part longitudinally costate, much more regularly so towards the apex than at the base, a smooth rounded 
space placed below the middle near the suture, the base (in the shape of a broad transverse band 
extending downwards at the sides), a spot at the apex, another at the sides below the middle, and the 
raised space near the suture, dark yellow; pygidium yellow, with the margins and a central longitudinal 
line black ; underside and legs black, the femora with the base and a spot at the apex, and the last 
abdominal segment, yellow. 
Hab. Mexico, Ciudad in Durango (Forrer), Ventanas in Durango (Hoge). 
This is a well-marked and somewhat easily recognized species, quite distinct from 
any other known from our region. The amount of yellow on the thorax varies (in one 
specimen the middle spot occupies a broad triangular space), but is regularly placed. 
If the yellow of the elytra is taken for the ground-colour, the black forms a broad 
common subquadrate patch, which sends a short branch upwards and two longer branches 
sideways, the latter extending to the lateral margin; the arrangement of the punctures 
in rows is very indistinct owing to the close punctuation. 
8(s). Pachybrachys durangoensis. (Tab. XX XVIII. fig. 25.) 
Subcylindrical, dark brown or obscure fuscous ; thorax extremely closely and finely punctured, lighter brown 
with obscure darker markings; elytra flavous, closely impressed with dark brown punctures irregularly 
placed, the interstices finely wrinkled; legs light brown, with dark markings. 
Length 2-22 lines. 
Hab. Mexico, Ventanas in Durango (/ége). 
This Pachybrachys, of which we have received two specimens, may be recognized by 
its opaque obscure fuscous colour and extremely closely punctured head and thorax, 
and by the absence of all longitudinal coste to the elytra. The head has the usual 
paler rings round the eyes, and some flavous spots on the lower portion; the antenne 
(2) do not extend to the middle of the elytra, and are dark fulvous, with the 
terminal joints darker. The thorax is about twice as broad as long, the sides being 
rounded at the base but distinctly narrowed towards the apex; the surface is 
extremely closely punctured, and very sparingly clothed with grey pubescence, and 
is light brown in colour, with an obscure (Y)-shaped brown mark on the middle of 
the disc. The ground-colour of the elytra is flavous, as well as the extreme and 
narrowly-raised basal margin; almost the entire surface is irregularly impressed with 
