Mr. H. W. Bates on the Coleoptera of the Amazon Valley. 117 
tractis, folio brevioribus ; drupa oblonga, 1-sperma.—lIn syl- 
vis prov. Rio de Janeiro. 
I have not seen this plant, which evidently is very closely 
allied to, if not identical with, one of the three last-named spe- 
cies. The size of the leaves is not given by DeCandolle, nor the 
characters of the flower; but its fruit and seed are completely 
those of V. mucronata. The calyx is said to be 5-partite, with 
puberulous ovate sepals; the drupe oblong and 1-sceded, the 
sced being plicated round the prominent longitudinal indurated 
placenta, which is enlarged by other two abortive cells, and 
projects far into the cavity of the fertile cell, the seed being 
suspended from its summit. The specimen, being fructiferous, 
appears to have had no flowers, as Prof. DeCandolle says of it, 
“flore ignoto.” 
XIV.—Contributions to an Insect Fauna of the Amazon Valley. 
Cotvorrera : Lonercornes. By H.W. Barss, Esq. 
[Continued from vol. viii. p. 478. ] 
Genus AUTHOMERUS. 
Thomson, Class. des Céramb. p. 338. 
Syn. Macronemus, Dej. Cat.; White, Cat. 
Char. emend. Body subcylindrical. Muzzle moderately 
broad, quadrate; front plane; antenniferous tubercles short, 
prominent, widely separated at their bases. Antenne naked, 
excessively elongated, in some species being five or six times the 
length of the body, capilliform ; the joints slightly increasing in 
length to the apex, the eleventh joint generally the longest ; the 
basal joint short, very slender at the base, abruptly enlarged into 
an ovate club. Palpi normal. Prothorax unituberculated on 
the sides. Elytra rounded at the tip. Femora clavate ; tarsal 
joints short. Prosternum greatly constricted between the large 
anterior coxee. 
The sexes are not distinguishable, as in Longicornes gene- 
rally, by the relative length of the terminal antennal joint in 
most of the species; there is a sexual character, however, in the 
apical ventral segment, the ¢ having in that part a deeply im- 
pressed fovea. The genus was established on certain curious 
species which agreed in having greatly elongated and hair-like 
antennz, and strongly bowed fore tibie. I have extended the 
definition so as to embrace the Alphus Lacordairet of Dejean’s 
catalogue—an insect which differs from all other A/phi, including 
A. tuberosus of Germar, to which it has otherwise some resems 
blance, in the curiously abrupt dilatation of the first antennal. 
