BRENTHUS.—NEMOBRENTHUS. 71 
but also by the unidentate hind femora, and by the coarser sculpture of the elytra and 
their different markings. The male has the metarostrum cylindric, without any trace 
of the lateral sinuate carinee so conspicuous in the commoner insect. 
15. Brenthus laticornis, sp. n. (Tab. III. fig. 7, rostrum and base of 
antenna, 2 .) 
2. Angustus, parum elongatus, niger; elytris linea flava elongata, juxta suturam sulcatis, externe seriatim 
fortiter punctatis ; antennis latis, articulo basali superne late impresso. 
Long. 14-18 millim. 
Hab. Nicaragua, Chontales (Janson); Panama, Bugaba (Champion). 
We have received only two female examples of this species ; though very similar to 
B. sculptipennis, it is undoubtedly distinct. The antenne have the basal joints unusually 
thick, and the first one has a large depression on its upper face. The fourth interstice 
of the elytra appears to be yellow from the base to the apex; this colour does not, 
however, extend to the apex, for on the terminal portion of the elytron the third and 
fifth interstices join together behind the end of the fourth, and this double interstice 
is yellow; the colour is, however, not quite continuous with that of the fourth interstice. 
The first stria next the suture is impunctate; outside the strie there are series of deep, 
moderately large punctures. The front tibie are not dentate internally. The tooth 
on each femur is distinct and sharp. 
Group NEMOCEPHALINA. 
NEMOBRENTHUS, gen. nov. 
Caput elongatum, posterius haud truncatum, sed a thorace sat profunde divisum, oculis a thorace distantibus ; 
antenn crassiuscule, articulis tribus ultimis clavam perparum discretam formantibus. Pedes crassi, 
tarsis brevibus. 
I propose this genus for an insect that appears to be intermediate between the 
« Brenthides vrais” and the Nemocephalides of Lacordaire, the head being separated 
from the bulbiform neck by a moderately deep constriction, but only very feebly 
truncate behind ; this would, perhaps, allow the genus to be placed in the Brenthides 
vrais, but the sculpture, general outline, and details of structure are so similar to some 
of the Nemocephalides that one is led to suppose the genus to be very near to the 
glabrous Nemocephali. Only the male is known. The antenne are thick, the ninth 
and tenth joints equal, distinctly longer but not broader than those preceding; the 
terminal joint acuminate, nearly as long as the two preceding. ‘The prorostrum is 
shorter than the metarostrum, and both parts are shaped as in Nemocephalus. ‘The 
head is formed like that of Nemocephalus, but on the upperside is separated from the 
neck by a deeper constriction ; this constriction does not exist on the under surface. 
The legs are broad, subcompressed; the femora compressed at the base, not pedun- 
culate ; the tarsi are broad and short, the third joint feebly lobed, the first joint a little 
