245 
gradually shorter ; red, with the three apical joints tinged in 
the middle with dusky. Thorax thinly clothed with pale silky 
tomentum, visible only in certain lights.; red, prosternum and cir- 
cuit of the acetabula blackish. Scutellum black. Elytra slightly 
dilated a little before the apex, the latter straightly truncated, 
with the outer angles slightly produced ; surface punctured and 
marked with one faintly raised line besides the lateral carina ; 
deep black, shining. Breast and abdomen black ; third and 
fourth ventral segments densely clothed with pale silky tomen- 
tum. Legs red, upper side of femora black. 
Eonte Boa, Upper Amazons. 
Genus Amphionycha (Uej. Cat.), Thomson. 
Thomson, Archiv. Entom. i. p. 311. 
The numerous species which compose this genus agree in the 
possession of long filiform antennse, with the joints more or less 
densely fringed with fine hairs, but never partially thickened, 
clothed, or tufted; the third joint is more or less dispropor- 
tionately elongated. The body is variable in shape, but is ge- 
nerally elongated and linear, in some species greatly elongated, 
in others much shorter and oblong. All have well-developed 
lateral carinse on the elytra ; the apices of the latter are variable, 
being in some species broadly truncated and toothed, in others 
briefly truncated, and in some species rounded and entire. 
1. Amphionycha Diana, Thomson. 
Amphionycha Diana, Thoms. Classif. ties C^’ambyc. p. 65. 
A. elongata, postice paulo attenuata, castaneo-rufa, occipite fascia 
brevi et macula laterali, thorace vitta lateral! et macula postica, 
elytris fascia communi subbasali maculisque utrinque tribus poste- 
rioribus cretaceo-albis ; prothorace pectoreque lateribus cretaceo 
plagiatis ; pedibus fulvo-testaceis ; antennis ciliatis, articulo tertio 
modice elongato ; elytris breviter truncatis. Long. 6^ lin. $ . 
This very handsome species occurred only in the forests of the 
Tapajos. It is found also in the interior of French Guyana. 
2. Amphionycha seminigra, n. s]). 
^.elongata, parallelogrammica, ferrugineo-testacea ; antennis, ely- 
trorum dimidio postico, pedibus posticis, tarsis omnibus et abdo- 
mine nigris ; thorace tuberoso ; elytris late truncatis, angulis pro- 
ductis. Long. 5 lin. 
Head coarsely punctured, testaceo-ferruginous. Antennae 
longer than the body ( ^ ?), finely fringed to the apex ; joints all 
slender, third double the length of the fourth ; black. Thorax 
vv^ith three large, smooth tubercles on the disk, and one on each 
