TYNNICHUS.—TRICHODOCERUS. 713 
1. Tynnichus tenuicostatus, sp.n. (Tab. XX XV. figg. 12, 12 a, 3.) 
Piceous, shining, the elytra, the anterior margin of the prothorax, and the legs rufo-piceous ; rather sparsely 
clothed with fulvous scales, the elytra with a few white scales along the third and fifth interstices ; the 
upper surface and legs also set with scattered, fine, suberect setae. Head densely punctate; rostrum with 
the base rugulosely, and the apical half sparsely, punctate. Prothorax narrowed in front, the sides 
parallel at the base; closely punctate. Elytra convex, compressed at the sides, narrowing from a little 
below the base, the humeri obtuse; rather coarsely punctate-striate, the interstices 3, 5, 7, and 9 very 
narrowly costate. Beneath rather coarsely punctate. 
Length 34, breadth 13 millim. (9 ?) 
Hab. Panama, Bugaba (Champion). 
One rather worn specimen, the white scales being perhaps more numerous when the 
insect is in good condition. 
Sect. TRICHODOCERIDES. 
This section agrees with the Old-World ‘‘ Camptorrhinides ” and the North-American 
‘‘Acamptides” (Acampti, Leconte) in having the rostral canal confined to the 
prosternum. 
It includes a single genus from Tropical America, the structural peculiarities of 
which are noticed below. The only Curculionid described with the antenne at all 
similar in form is Hedycera megamera, Pasc.*, from Cayenne, which appears to be 
most nearly related to Piazurus of the group “ Zygopina.” 
TRICHODOCERUS. 
Trichodocerus, Chevrolat, Bull. Soc. Ent. Fr. 1879, p. xcu. 
The characters of this remarkable genus, incompletely given by Chevrolat, are as 
follows :— 
Head deeply sunk into the prothorax ; mandibles bifid at the apex ; eyes exceedingly large, somewhat coarsely 
facetted, almost contiguous above; rostrum rather slender, curved, cylindrical, depressed and dilated at 
the base, the scrobes short and oblique; antennz inserted close to the base of the rostrum; funiculus 
7-jointed, joint 1 as stout as the scape, 2-7 very slender, long, and filiform, 3—7 gradually decreasing in 
length, these latter set with one or more long projecting bristles and several very fine hairs ; club composed 
of four smooth, slender, elongate joints, the tip of each of which is more or less swollen, and set with a 
whorl of long scattered bristles intermixed with fine hairs ; prothorax broader than long, bisinuate at the 
base, with feebly developed ocular lobes; scutellum visible ; elytra oblong, wider than the prothorax, with 
ten complete rows of punctures ; prosternum raised and angularly projecting between the subcontiguous 
anterior cox, the rostral canal open behind, deep, rapidly narrowed, receiving the basal portion only of 
the rostrum ; metasternum long, the episterna broad; ventral segment 2 longer than 3 or 4; legs rather 
short, similar in the two sexes; femora thickened, unarmed, the anterior pair sometimes with an indistinct 
tooth ; tarsi with joint 3 bilobed, the claws simple. 
The type, Z. spinole, inhabits Central and South America. Another species is 
now added. 
* Journ. Linn. Soc., Zool. x. p. 457, t. 18. figg. 11, 11 a (1870), 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 4, Apri/ 1906. 4YY 
