296 Mr. George C. Champion on Serricorn Coleoptera. 
rami, the third joint also relatively longer, the elytra 
unicolorous, etc. Amongst the very numerous Central- 
American species, the present insect is nearest allied 
to P. marginata, Champ., from which it may be sepa- 
rated by its much smaller size, narrower shape, more 
narrowly margined elytra, shorter third antennal joint, 
etc. P. marginata has only been found in Southern 
Mexico and Guatemala. 
Ptilodactyla antillarwm, sp.n. 
¢. Oblong-elliptic, narrow, moderately convex, shining, some- 
what thickly clothed with yellowish-cinereous pubescence; black, 
the elytra with an oblique testaceous humeral patch, the suture 
partly piceous, the antenne black, with the two basal joints red- 
dish, the palpi and legs testaceous. Head sparsely, very finely 
punctate, the eyes rather small; antennze comparatively stout, 
joints 4-10 each with a short ramus, 3 and 4 subequal. Prothorax 
short, convex in front, the sides rounded and rapidly converging 
from a little before the base to the apex; the base trisinuate, 
smooth ; the surface sparsely, finely punctate. Scutellum with a 
shallow notch in front. Elytra of about the same width as the 
prothorax at the base, subparallel in their basal half, narrowly 
margined at the sides, the humeri rounded ; seriate-punctate to 
near the apex, the interstices sparsely minutely punctate. Tarsal 
claws with a rectangular tooth extending to about the middle. 
Length 3, breadth 14 millim., 
Hab. St. Vincent. 
One male example. ‘Tis insect is allied to P. humerosa, 
from which it may be known by the less elongate, black 
antennee, with shorter rami and relatively longer third 
joint, the smaller and less prominent eyes, etc. Six 
females from Grand Etang, Grenada (1,900 feet), belong 
to the same, or to a very closely allied, species; they are 
smaller and paler than the male described, and have the 
thorax thickly granulate-punctate, the antennz more 
slender, etc. The antenne in P. antillarum are formed 
very much as in P. swbstriata, Champ., from Costa Rica. 
