CLASSIFICATION OF THE RHYNCHOPHOROUS COLEOPTERA. 463 
The tribe Alophini retains a remnant of a form seen otherwise 
only in the preceding family; the elytra are convex, with the 
humeri not prominent and the prothorax is comparatively small. 
The prominence of the gular margin easily distinguishes it from 
all other tribes. The tibiz are slightly mucronate at the inner 
angle of the tip, and the terminal surface is well defined, not lat- 
eral. The apical margin of the mandibles is curved, sharp and 
prominent, thus making the outer face broad and flat, with a well 
defined margin. Liophlous inquinatus Mann, from Alaska, be- 
longs to this tribe, and seems scarcely different from Alophus, 
except by the shorter and stouter funiculus. Lepidophorus lin- 
eaticollis on the other hand has an entirely different oral structure, 
and is apparently allied to Phytonomus, ete. 
Ithycerus is a completely isolated form, having no relation with 
other genera. As pointed out y Dr. Horn,* the remark of Prof. 
Lacordaire, that the ĝ has 6 ventral segments, is an erroneous 
interpretation of the very convex last dorsal segment, which can 
be seen from beneath. 
BRENTHIDZ. 
The species of this family are remarkable for the very elongate 
form, and by the great sexual differences which sometimes occur in 
the mouth organs. In our own Eupsalis minuta for instance, the 
beak of the male is broad, short and flat, with large prominent 
mandibles, while in the female the beak is long and slender, with 
very small mandibles. But two genera occur in our fauna; Eup- 
Salis on the Atlantic slope from Canada to Texas, and Brenthus 
in Lower California. 3 
The mouth is not constructed on the same plan as that of the 
long beaked Curculionids ; the gular peduncle is wanting, and the 
mentum varies in form according to the shape of the buccal open- 
ing, which it nearly fills, thus concealing the maxille. The family 
is also easily known by the antenne being 11- jointed, not clavate 
nor geniculate, nearly moniliform in Eupsalis, somewhat com- 
Pressed and broader externally in Brenthus. 
The eyes are rounded, the lenses are covered with a perfectly 
Smooth membrane, and are consequently not granulated, the front 
Coxe are separated by the prosternum ; the metasternum is long, 
and the side pieces are distinct and very narrow. The Ist and 2d 
rie ih AE aussie ot OE 
* Proc, Am. Phil. Soc. 1873, 447. 
