Jan. io, 1914 
Potato Weevils from South America 
349 
apex; club elongate, with the first two joints occupying over half the bulk. Head, 
beak, and scape densely clad with fine, silky, bronzed scales; funicle sparsely pubes¬ 
cent; club minutely pubescent. 
Prothorax basally truncate, apically sinuate, strongly lobed over eyes, lobes with¬ 
out vibrissae; coarsely punctured, finely squamose with yellowish to golden metallic 
scales; median line punctate, strongly impressed; surface with six basal, two discal, 
and four apical tubercles; widest behind middle at points of lateral basal tubercles. 
Elytra at base no wider than thorax; humeri rounded; sides rounded, rough, wider 
than prothorax. Scutellum minute, triangular, depressed. Surface densely minutely 
scaly; striae irregular, with small definite punctures; entire surface rough, but the 
third, fifth, and seventh intervals especially are raised by a series of small tubercles, 
which give the striae a wavy direction. 
Prostemum strongly arcuately emarginate, not more than one-half as long as pro- 
notum. Anterior coxae contiguous. Mesostemum taken up almost entirely by the 
coxae, which are narrowly separated; side pieces unequal. Metastemum also short. 
Undersides and legs densely squamose. 
Type.—Cat. No. 16689, U. S. National Museum. 
The third species also belongs to a new genus quite closely related to 
Premnotrypes and belonging in the same tribe. Several specimens in a 
more or less perfect condition were found by Mr. Sanford in cells in 
potatoes received October 9, 1913, from Cuzco, Peru. This species breeds 
in a manner closely resembling that of the Premnotrypes solani. 
This species (PI. XIT, fig. 3; text fig. 3) may be identified from the 
following technical descriptions. 
Trypopremnon, new genus. 
Name derived from rpunaa) (to bore) and npkpvov (root), signifying a root-borer. The 
name is simply " Premnotrypes J ’ reversed, because the two genera belong side by side. 
Type of genus. — T. latithorax , new species. 
Upper surfaces roughly sculptured throughout and closely 
squamose. Beak longer than head, enlarged at alae, not impressed 
on median line except at frontal fovea and near apex; scrobes 
broadened behind and abruptly truncate; mandibles beneath 
sharply toothed. Eyes vertical, elongate oval, pointed beneath. 
Antennae with scape clavate, not greatly overlapping the anterior 
edge of the eyes; funicle seven-jointed, joints 1 and 2 elongate, 
the others progressively shorter and the last three transverse, 
moniliform; club elongate oval. Prothorax very roughly molded; 
median line deeply impressed; anterior lobes without vibrissae, 
almost completely covering the eyes; base truncate; apex sinuate. 
Elytra with humeri rounded; striation irregular, with alternate 
intervals rough and raised. Body wingless. Thorax beneath 
with all parts short; mesothoracic side pieces unequal; mete- 
pimera elongate, moderately broad, Intercoxal process broad; 
first two abdominal segments occupying over half the abdomen; 
the first suture arcuate; the second segment as long as the 
two following; fifth segment as long as the second. Femora and tibiae stout; tibiae 
mucronate; tarsi pubescent beneath, with third joint strongly bilobed, the lobes 
much wider than the preceding joints; claws simple. The posterior tibiae have the 
point of attachment of the tarsi terminal and close to the mucro. The apical surface 
is divided by a ridge into two almost equal slanting disks, like a roof. The ridge runs 
directly to the middle of the corbel. 
Fig. 3. —Trypopremnon 
latithorax Pierce: Lat¬ 
eral view of thorax 
and beak. 
