350 
Journal of Agricultural Research 
Vol. I, No. 4 
Trypopremnon latithorax, n. sp. 
Length, 6 mm.; greatest breadth, 2.75 mm. Beak longer than head and narrower 
than eyes except at alae; the dorsal sqnamose portion being gradually narrowed from 
the eyes to the apex. Alae strongly flared, making the apical portion of the scrobes 
open above. Head very slightly tumid above the eyes. Median line distinct only 
to the frontal fovea, which is deeply depressed and very faintly indicated beyond 
this point. The lateral depressions on the beak are quite faint. Apex of beak shin¬ 
ing reddish, with the nasal plate polished, ogival, and raised at apex. Mandibles 
shining, reddish; deciduous piece long, shining, acute, arcuate, with sharp edges 
and with a strong, acute, erect ventral tooth. Antennal scrobes strongly flexed down¬ 
ward, very much broadened and evanescent behind; scape clavate; funicle with 
first two joints elongate, the others progressively shorter and the last three transverse, 
moniliform; club elongate oval. Head, beak, and scape densely clad with fine, 
silky, bronzed scales; funicle sparsely pubescent; club minutely pubescent. 
Prothorax basally truncate, apically sinuate, with very strong supraocular lobes, 
which are without vibrissae; coarsely irregularly punctured, finely squamose with 
golden metallic scales; median line strongly impressed; surface very uneven with two 
basal and two discal elevations and with the sides very irregular, sinuate or bitumid; 
widest at posterior lateral tumidities. 
Elytra at base narrower than thorax; humeri rounded; sides feebly convex. Scutel- 
lum triangular. Surface densely, minutely scaly; striae irregular, with strong punc¬ 
tures, entire surface rough, but the third, fifth, and seventh intervals especially are 
raised by a series of tubercles, which give the striae a wavy direction. 
Prostemum strongly arcuately emarginate, hardly half as long as the pronotum. 
Anterior coxae contiguous. Mesostemum taken up almost entirely by the coxae, 
which are narrowly separated; side pieces unequal. Metasternum also short. Under¬ 
sides and legs densely squamose. 
Type.—Cat. No. 16690, U. S. National Museum. 
Differs from Premnotrypes solani in the sculpturing of the beak, the shape of the 
scrobes and mandibles, and of the nasal plate, the absence of distinct tubercles on 
the head, the shape and sculpture of the prothorax, and the elytral striation. The 
third tarsal lobes are also much more distinct. 
The weevil Rhigopsidius tucumanus Heller (PI. XL) is, according to 
present information, more widely distributed than either of the other 
species. It was originally described by Heller 1 from Tucuman, Argen¬ 
tina, and was recorded in the note by Sasscer and Pierce, 2 quoted above, 
1 Heller, K. M. Neue Riisselkafer aus Central- und Sudamerika. Bnt. Ztg. Stettin, 1906. Bd. 67 
(Heft 1), p. 7-9, pi. i. t figs. 3. 3^, and 3b. 
a This weevil (PI. XT) belongs to the family Psaliduridae, subfamily Rhytirhininae, tribe Rhytirhinini. 
The nearest North American insects are the species of the genus Thecesternus in the tribe Thecesternini of 
the same subfamily. 
The following description, taken from Sasscer and Pierce (op. cit.), will identify this species. 
Length, 9 mm., yellowish or purplish brown, with thickly matted vestiture of a cinereous shade mottled 
with black dots. Head concealed from above by prothorax and eyes, almost covered by the lateral pro- 
thoracic lobes. Beak moderately short, usually reposing in a deep pocket of the prothorax, which is pos¬ 
teriorly limited by the anterior coxae. Beak medianly and laterally carinate to a cross carina between the 
bases of the antennal scapes. Scrobes deep and narrow from apex near tip of beak almost to eyes, then 
sharply deflected and broader in front of eyes. Scape stout, clavate. Funicle 7-jointed, the last joint 
apparently a part of the club. Club 4-jointed. Head at base sinuately impressed, with swellings above 
the eyes. Prothorax very irregularly sculptured but with a deep median furrow widened angularly at 
middle and also behind, Strial punctation deep but irregular. Intervals tumid behind. Tegs stout. 
Tarsi with third j'oint not widely bilobed; tarsal claws simple. First and second abdominal segments long; 
third and fourth shorter than fifth. 
