MASTOSTETHUS. 59 
The elytral pattern of WM. cordovensis agrees nearly with that of WU. salvini; but the 
colour of the head, thorax, and legs and the shape of the elytral spots are different. 
The three specimens obtained do not differ from each other, except in the broader 
shape of the transverse elytral band in one example; the flavous or testaceous apical 
portion of the elytra forms a large ovate spot. IU. duplocinctus has a similar elytral 
pattern, but is a much broader insect ; it has the head entirely black, and the shape of 
the elytral black band is quite different. From other somewhat similarly-coloured 
species M/. cordovensis may be known by the flavous apex of the elytra; from M. rogerst 
by the colour of the head, thorax, and legs; and from MW. chontalensis by the triangular 
shape of the humeral spot, and the position and shape of the posterior band, also by 
the different coloration of the underside and legs. MW. zonatus, Klug, from Brazil, is 
another closely allied species; but in this the head has a transverse (not longitudinal) 
black band, the elytral fascia is narrower and of different shape, and the colour of the 
legs is not entirely black, but fulvous and black. 
8 (s). Mastostethus gracilenta. (Tab. XXXVI. fig. 6.) 
Testaceous, a transverse band on the head, the antenne, two spots on the thorax, the upper edge of the 
anterior femora, the tibia, and the sides of the breast, black ; elytra very closely and strongly punctured, 
testaceous, a narrow transverse band at the base, and a broad band at the middle, black. 
Length 3 lines. 
Hab. Panama, Bugaba, Volcan de Chiriqui (Champion). 
In coloration this species closely resembles MM. salvini and its allies, but it differs 
from them all in the strong and close (almost rugose) punctuation of the elytra. The 
head is black at the base and between the eyes, the black markings being connected 
together in one of the specimens, and enclosing two small fulvous spots. The thorax 
is rather broad, and entirely impunctate; and has two large subquadrate black spots 
on each side, joined in one specimen at its base. The elytra are rather narrow and 
somewhat convex, and have a slight depression below the base at the suture; the band 
at the base is narrowed at the suture; the posterior band is broad, slightly curved, and 
extends to the sides, leaving the apex largely flavous, its anterior edge is nearly even, 
the posterior one slightly irregular. The femora are testaceous, the two anterior pairs 
streaked with black above. The underside is flavous or testaceous, with a spot near 
the anterior coxe, and the sides of the breast (more widely so in front) and of the 
metasternum, black. 
Mastostethus rubricollis (p. 21). 
To the locality Mexico, add :—Toxpam, Cordova (Sallé), Jalapa (Hoge). 
The thorax in all the specimens before me has either a black transverse band or two 
more or less distinct spots on the middle of the disc. 
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