208 RHYNCHOPHORA. 
1. Isodrusus debilis, sp. n. [Sharp]. (Tab. VIII. fige. 32, 32a; 326, wing.) 
Subdepressus, ferrugineus, squamosus, setis recurvatis adspersus; prothorace elongato; elytris basi thorace 
latiore, seriatim punctatis. 
Long. 23-3 millim. 
Hab. Guatemata, San Gerdnimo (Champion). 
Antenne very short, joints 3-7 of the funiculus quite small, club moderate. 
Rostrum strongly deflexed, even a little inflexed; front of the head armed with 
numerous curved bristles. ‘Thorax elongate and slender, a little dilated in the middle, 
squamose, and armed with curved sete. Scutellum very small, but distinct. Elytra 
rather slender and flat, much broader at the base than the thorax, densely squamose, 
the scales presenting an imperfect maculated appearance of pale grey and fuscous ; 
with series of punctures much obscured by the squamosity, and bearing fine, recurved, 
recumbent sete. Legs short, strongly setose. Under surface red, but nearly covered 
with large pallid scales. 
Four specimens were obtained of this species, one of which has been sacrificed to 
make certain the condition of the wings. The insect bears a great resemblance to the 
species of Jsodacrys, but the form of the elytra distinguishes it at a glance. 
Group POLYDROSINA. 
Under this group—the first of those with both ocular lobes and vibrisse wanting— 
are placed Polydrusus, Germ. (= Cyphomimus, Horn), which proves to be well repre- 
sented within our region, and an allied genus, with basally connate tarsal claws, a 
slender, apicaliy thickened antennal scape, and the articular surface of the posterior 
tibie terminal. Horn included Cyphomimus in his heterogeneous Tribe Phyllobiini, 
with Phyllobius (which has differently placed, short, subterminal scrobes), Mitosty/us 
(which is apterous and belongs to the Sciaphilina of Sharp, anted, p. 167), and 
Scythropus, the last-mentioned genus being nearly allied to Polydrosus. Mitostylus 
extends to Lower California, and probably into our region also; Scythropus is 
holarctic, 
POLY DROSUS. 
Polydrusus, Germar, Ins. Spec. nov. p. 45] (1824). 
Polydrosus, Schénherr, Cure. Disp. Meth. p. 188 (1826) ; Gen. Cure. ii. p. 184; Lacordaire, Gen. 
Col. vi. p. 78 ; Bedel, Faune Col. Bass. Seine, v. p. 50; Horn, Proc. Calif. Acad. Sci. (2) iv. 
p. 446 (1894). 
Cyphomimus, Horn, Proc. Am. Phil. Soc. xv. pp. 104, 105. 
No true winged Polydrosus seems to have been described from Tropical America, 
and but two from the United States (P. americanus, Gyll., the type of Cyphomimus, 
