PACHYBRACHYS. — 148 
seems to prove the validity of P. labyrinthicus. The colour is pale yellowish above ; 
_ the thorax has the usual markings much less conspicuous than is generally the case, a 
' small dark brown spot in front of the scutellum alone being prominent ; and the elytra 
have the smooth subsutural space drawn out into an elongate triangle (this space not 
being ovate or rounded as in P. irregularis). P. labyrinthicus seems to be constant in 
colour and sculpture, and it differs also from P. irregularis in having a short double 
row of punctures surrounding the scutellum (instead of the corresponding space 
irregularly punctured as in the allied species). The specimens from Ciudad are much 
darker, and have the interstices between the punctures marked with streaks of black, 
the punctured rows themselves often becoming nearly united; these examples cannot 
be satisfactorily separated from P. labyrinthicus. 
Pachybrachys punctatissimus (p. 68). 
To the Mexican localities given, add:—Jalapa (Hége). 
To the description of this species I may add that the interspaces between the punc- 
tures of the thorax are unevenly rugose or wrinkled, and, therefore, the sculpture is 
quite different from that of most other species of the genus; the thorax also has a 
more or less distinct narrow raised central ridge extending from the anterior to the 
basal margin; the elytra are nearly white, and everywhere impressed with brown 
punctures, which near the suture and apex aggregate and form short stripes, and are 
without longitudinal striz or coste. 
Pachybrachys umbraculatus (p. 69). 
To the Mexican locality given, add :—Saltillo in Coahuila (Dr. Palmer). 
This is evidently a good species, of which our figure is a good representation. The 
sixteen specimens received from Saltillo scarcely show any variation; the thorax is 
proportionately longer than in most other species of the genus, and its markings are 
nearly always only indicated by obscure dark fulvous or piceous spots. 
14 (a). Pachybrachys flavescens. (Tab. XXXIX. fig. 5.) 
Broad and robust, pale flavous, the sides of the breast darker; thorax irregularly and subremotely punctured ; 
elytra with regular rows of dark and deep punctures, the space between the second and fourth rows 
triangularly widened. . 
Length 2 lines. 
Head entirely pale flavous, finely but not very closely punctured ; the eyes widely separated; antenna nearly 
as long as the body, flavous, the apical two joints more or less black ; thorax scarcely twice as broad as 
long, of about half the length of the elytra, the sides obliquely narrowed from below the middle to the 
apex, the disc irregularly but not very closely punctured, entirely flavous ; scutellum flavous, margined 
with piceous; elytra of the same colour as the thorax, with eleven nearly regular rows of large black or 
brown punctures—of these three short rows are placed round the scutellum, the first row straight, the 
second and third rounded, the latter after curving round towards the suture at the middle running parallel 
