MASTOSTETHUS.—AGATHOMERUS. 63 
disc commences a little below the base and ends at some distance from the apex (if 
the black is taken for the ground-colour, the elytra may be described as having a 
narrow oblique transverse band at the base and the apex fulvous, with the extreme 
lateral margin also of this colour). The underside is flavous, with the exception of a 
small black spot on the sides of the thorax, and another on the side-pieces of the meso- 
and metasternum. The femora are flavous, the two anterior pairs streaked with black 
above; the tibie and tarsi are entirely black. The metasternum, as in the preceding 
species, is raised into a conical projection. 
Four specimens, all agreeing in the above particulars. 
27. Mastostethus octomaculatus. (Tab. XXXVI. fig. 14.) 
Testaceous, the base of the head, the basal joints of the antennx, the scutellum, the sides of the breast, and 
the tibise, black ; thorax with a black basal band; elytra remotely punctured, black, each with a round 
spot at the base, a transverse one at and another below the middle, and a small spot at the sides of the 
base, flavous; femora strongly dentate. 
Var. Thorax without black band, the two anterior elytral spots confluent, the femora spotted with black. 
Length 4—43 lines. 
Head rather closely punctured, flavous, the upper portion, labrum, and mandibles black; antennse compara- 
tively long, extending beyond the base of the thorax, the four basal joints and the upper surface of the 
following three joints black, the rest fulvous ; thorax twice as broad as long, the sides straight, the surface 
with some fine punctures, obscure testaceous, the basal margin with a narrow black stripe which does 
not extend to the sides; scutellum black; elytra distinctly and rather remotely punctured, each with 
three large spots (a round one at the base, a similar but larger spot near the apex, and one of more 
transverse shape at the middle), a small spot also being placed on the lateral margin at the sides of the 
shoulders, the spots divided from each other by narrow black bands of the ground-colour ; below fulvous, 
the middle portion of the anterior femora, the tibiz, and the sides of the breast, black, the posterior 
femora also streaked with black above, the latter armed with a strong tooth near the apex in the male, 
the tarsi black. 
Hab. Panama, Bugaba (Champion). 
M. octomaculatus may be known from its allies by the elytra having six (three on 
each) large testaceous or flavous spots, and also a small lateral one at the base. 
The variety has the two anterior spots on the disc joined into a somewhat pear- 
shaped single spot ; in this specimen the posterior femora have their outer half entirely 
black, but the narrow black band on the thorax is absent. WU. sexguttatus, Lac., from 
Guiana, seems to be a closely allied species; but differs in the absence of the small 
shoulder-spot, and in the thorax having a black discoidal band, as well as in other 
particulars. A typical example is figured. 
AGATHOMERUS (p. 24). 
Agathomerus rufus (p. 24). 
To the locality Mexico, add :—Ventanas (Yorrer), Puebla, Cuernavaca, Panistlahuaca, 
Oaxaca, Tuxtla, Tehuantepec (Sal/é). 
There are some specimens contained in the Sallé collection in which the head has a 
small black spot on the vertex and the thorax a similar one on the disc; these examples 
