AMBATES. 169 
punctate-striate, the interstices flat and densely punctulate. Ventral segments | and 2 broadly depressed 
down the middle in the 3. 
Length 43-5, breadth 13-2 millim. (<.) 
Hab. Panama, Taboga I. (J. J. Walker).—Cotomata (Mus. Brit.), Honda ?, 
Two specimens, precisely similar. The broad ochreous lateral vitta of the prothorax 
is very conspicuous in this insect, contrasting with the black vestiture of the elytra, 
which is so close as to almost hide the fine strie. ‘The irregular ochreous markings at 
the apex, too, are sharply defined. A. vitticollis appears to be distributed in collections 
under Jekel’s MS. name; and Chevrolat’s description doubtless applies to the same 
species. 
31. Ambates albiventris, sp. n. (Tab. X. figg. 10, 10a, ¢.) 
Elongate, subfusiform, dull; mottled above with a sparse clothing of small yellowish-white and fuscous scales, 
the sides of the prothorax (including the whole of the flanks), an oblique patch at the sides of the elytra 
below the base, a spot on each elytron near the apex, and the entire under surface, densely clothed with 
coarser, yellowish-white scales. Rostrum arcuate, moderately stout, about as long as the head and 
prothorax, rugulosely punctate at the base, and for the rest sparsely, very finely punctate, the antennz 
inserted at the middle, joints 1 and 2 of the funiculus comparatively elongate. Prothorax rather convex, 
a little broader than long, gradually narrowing from the base, the sides rounded anteriorly ; densely, 
rugulosely punctate. Elytra long, gradually narrowing from the base, flattened on the disc anteriorly ; 
finely punctate-striate, the interstices flat, densely, rugulosely punctate and subgranulate. Ventral 
segments 1 and 2 broadly depressed down the middle. Legs rather long; tibie and tarsi comparatively 
slender, the posterior tibie sinuate within. 
Length 54, breadth 23 millim. (<¢.) 
Hab. Costa Rica, Reventazon, Plains of Santa Clara, Atlantic slope (Biolley). 
A single specimen, rather worn, found in Dec. 1904. This insect is nearly related 
to A. immaculatus, from Chiriqui. The dense whitish vestiture of the lateral portions 
of the prothorax and of the under surface, the oblique whitish patch at the sides of 
the elytra beneath, the long rostrum, with the antenne inserted at the middle, and the 
two yellowish-white subapical spots, sufficiently distinguish it. 
32. Ambates immaculatus, sp.n. (Tab. X. figg. 11, lla, 2.) 
Elongate, dull, black, the antenne (the club excepted) ferruginous, the tarsi piceous or rufescent ; uniformly 
clothed above with minute, cinereous, hair-like scales; the vestiture of the under surface, femora, and 
tibize coarser and closer, wholly white, that of the tarsi ochreous, the ventral segments 3 and 4 in the 9 
and 3-5 in the ¢ with a narrow bare space down the middle. Rostrum arcuate, moderately stout, 
rugulosely punctate (and in one specimen carinate) at the base, for the rest sparsely, minutely punctate, the 
antenne inserted at ( ¢) or behind ( ? ) the middle, joint 2 of the funiculus shorter than 1. Prothorax 
broader than long, gradually narrowing from the base, constricted in front; densely, rugulosely punctate 
and with indications of a raised median line. FElytra elongate, a little wider than the prothorax, 
depressed on the disc anteriorly, with prominent subapical callosities ; finely punctate-striate, the 
interstices flat, densely, rugulosely punctate and subgranulate. Ventral segments 1 and 2 broadly 
depressed down the middle, and 5 with a shallow smooth fovea near the apex, in the ¢. 
Length 53-64, breadth 23-22 millim. (¢ 9.) 
Hab. Panama, Bugaba (Champion). . 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, February 1907. ZZ, 
