TERIDATES.—THYSANOCNEMIS. 203 
rugulosely punctate and pubescent at the base, for the rest sparsely punctured and bare, the antenne 
inserted at about three-fifths from the apex. Prothorax narrowing almost from the base, closely punctate, 
with indications of an abbreviated smooth median line. Elytra coarsely punctate-striate, the interstices 
scarcely wider than the striz, almost flat, and rugulose. Beneath coarsely, shallowly punctate. 
Length 13, breadth 1 millim. 
Hab. BraztL, Rio Janeiro (coll. Pascoe in Mus. Brit.). 
One specimen, probably a female. The pygidium is exposed, but this is due to the 
apex of the abdomen being unduly extended. ‘The elytra are widest a little below 
the base, their general shape being cordiform. | 
2. Teridates confusus, sp. n. (Terambus confusus, Tab. XI. fig. 25.) 
Very like 7. sertatus, but with the femora and tibiz black; the prothorax more densely punctured; the elytra 
broader anteriorly, with the interstices flat and wider than the strize; the pubescence more abundant, 
and confusedly arranged on the elytra, there being two irregular rows of fine hairs between the seriate 
interstitial sete, the latter more seattered than in 7. seriatus, the line of pubescence along the suture not 
imbricate; pygidium covered by the elytra. 
Length 14, breadth 1 millim. 
Hab. Panama, Bugaba (Champion). 
One specimen. 
Group TYCHIINA. 
‘iy, 
Tychiides vrais, Lacordaire ; Tychiini, Leconte. 
Two genera of this group are represented in Central America, S¢ebinea including 
some peculiar isolated forms. 
THYSANOCNEMIS. 
Thysanocnemis, Leconte, Proc. Am. Phil. Soc. xv. p. 214 (1876); Casey, Ann. New York Acad. 
Sci. vi. p. 425 (1892). 
? Plocetes, Leconte, loc. cit. p. 2138. 
Four species of this genus have been described, all from the Southern United States, 
and numerous others from our region are here referred to it. 
In the type of Thysanocnemis, T. fraxini, Lec., the anterior tibie are thickened and 
ciliate in the male, but in the other N.-American forms, as described by Casey, and in 
those now added, the anterior tibie are simple in both sexes. 
Plocetes, Lec., to judge from the description, seems only to differ in having a short, 
carinate rostrum, a peculiarity possessed by the males of certain species of Thysanocnemis. 
The various Central-American forms are recognizable by the peculiar maculation and 
vestiture of the elytra, which are very much wider than the prothorax, the laterally 
angulate second and third ventral sutures, the toothed tarsal claws, the large and 
narrowly separated eyes, &ec. The antennal club is ovate and very similar in form in 
the species here described. All the tibie are unguiculate, except in 7. brevis and 
T. pusillus, which have the hind pair unarmed at the apex. 
2DD2 
