78 RHYNCHOPHORA. 
have the third joint of the antenne less elongate. When the elytra are looked at from 
the sides they appear a little shining, and have a faint metallic tinge. The female 
resembles the male in colour and sculpture; it has the metarostrum sulcate. 
Of the five specimens of this species, the four males were found by Belt and Janson ; 
the single female comes from M. Sallé’s collection, where it was not accompanied by any 
male, but there can be no doubt that all the specimens belong to one species. 
3. Acratus filum, sp. n. (Tab. III. fig. 15, 3.) 
Gracillimus, niger, supra enescens; femoribus basi, tibiis, tarsis antennisque plus minusve flavescentibus ; 
elytris impunctatis, bistriatis, stria externa anterius valde abbreviata, apicibus acuminatis. 
Long. 27 millim. 
Hab. British Honpuras, R. Hondo (Blancaneauc). 
Although very similar to A. apicalis, this species is very distinctly brassy on ‘the upper © 
surface, especially on the elytra, and is easily distinguished by the form of the apices of 
the elytra; the terminal portion of the wing-cases is prolonged and attenuate, and at 
the extremity divided into separate angles, which leave a small angular notch between 
them. There are one or two transverse wrinkles at the back of the head, and on careful 
examination of the under surface it is seen that the metarostrum is not absolutely 
glabrous, but bears on the sides behind a few very fine sete. The terminal ventral 
segment is rather densely punctate, and bears much fine, rather long pubescence. 
Two males. 
The description of the Brazilian Brenthus (Teramocerus) acutipennis, Boh., corre- 
sponds in many respects with A. filum, but in J. acutipennis both of the two strie on 
the elytra extend to the base. 
Group ITHYSTENINA. 
TERAMOCERUS. 
Teramocerus, Schénherr, Gen. Cure. v. p. 556 (1840) ; Lacordaire, Gen. Col. vii. p. 465. 
This genus has hitherto consisted of seven South-American species. 
The insects I assign to Zeramocerus differ, so far as the male is concerned, from 
Acratus by the great elongation of the basal joint of the hind tarsus, and by the two 
basal joints being carinate above. The female shows no trace of these peculiarities, 
and I see nothing to distinguish it from the corresponding sex of Acratus. 
1. Teramocerus belti, sp. n. (Tab. III. figg. 16,3; 17,2.) 
Mas. Gracillimus, nigricans, supra metallescens ; elytris viridi-eneis, sutura purpurascente, apicibus acuminatis. 
Long. 36 millim. 
Fem. Rostro anterius, antennis tibiisque flavescentibus; antennis articulis 3° ad 8™ nigro-setosis. 
Long. 14 millim. 
Hab. Nicaracva, Chontales (Belt, Janson). 
