152 PHYTOPHAGA.—SUPPLEMENT. 
colour, and although the elytra are only furnished with two coste they have the 
punctures much more closely placed and forming distinct rows at the sides; the thorax 
of P. maculicollis has also well-defined spots. There are but few species from our 
region which are devoid of elytral coste, therefore P. sonorensis is rather more easy 
to recognize than most of its congeners. 
31. Pachybrachys longicollis. (Tab. XXXIX. fig. 12.) 
Dark or lighter brown, finely pubescent beneath; thorax proportionately elongate, very closely and finely punc- 
tured, with the usual scarcely perceptible darker markings ; elytra irregularly punctured, the sides more 
or less distinctly longitudinally costate ; pygidium flavous; legs fulvous, with or without black marks 
on the femora. 
Length 2 lines. 
Hab. Mzxico, Cordova (Sallé). 
P. longicollis is well distinguished from the numerous allied forms by its elongate 
thorax, the latter being half the length of the elytra in the male and but slightly 
shorter in the female. The antenne are scarcely half the length of the body in the 
male, and still shorter in the female. The head is finely and closely punctured, pale 
brownish, with a dark central line which is widened at its apex. The thorax is very 
closely and finely punctured, pale brown, very obscurely spotted with darker brown at 
the sides and middle (the usual darker bands to be found in many other species of the 
genus being indicated). The scutellum is flavous, margined with dark brown. The 
elytra are pale brown, with the interior of the punctures nearly black, the punctures 
somewhat differently arranged in the two sexes—in the male they are more widely 
separated and form very irregular rows, even on the space near the suture, the outer 
portion being, as usual, more regularly punctured and with the interstices slightly 
costate; in the female they are very closely placed, very irregularly so on the sutural 
space, and the lateral costee are much more distinctly raised; each elytron is also very 
obscurely but distinctly marked with two or three dark spots near the sides and two 
others near the suture, one below the other. The pygidium is entirely flavous; the 
underside and legs in the female are fulvous, and the femora have a dark ring at the 
middle which is absent in the male. 
82. Pachybrachys brevicollis. 
Pale yellowish-white ; the breast and part of the abdomen black; thorax with the sides nearly straight, not 
closely punctured, the disc with a pale brown M-shaped mark; elytra with semiregular lines of brown 
strie, the sutural two enclosing a wider interstice. 
Length 1 line. 
Head nearly white, with a narrow brown central stripe which diverges anteriorly into two branches; the 
clypeus with a few brown punctures, the rest of the surface impunctate; antenne half the length of the 
body, the lower joints fulvous, the rest black; thorax very short, the sides but slightly rounded, the 
surface finely punctured on the darker portion, the latter pale yellowish-brown and occupying the usual 
position, the lateral spot including a small whitish one; scutellum yellowish-white; elytra with three 
