426 Mr. H. W. Bates on the Longicorn Coleoptera 
1. Amphionycha Diana, Thomson. 
Amphionycha Diana, Thoms. Classif. des Cérambye. p. 65. 
A. elongata, postice paulo attenuata, castaneo-rufa, occipite fascia 
brevi et macula laterali, thorace vitta laterali 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, un. sp. 
A. 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. Antenne 
longer than the body ( ¢?), finely fringed to the apex ; joints all 
slender, third double the length of the fourth; black. Thorax 
with three large, smooth tubercles on the disk, and one on each 
side, red; margins marked with a few very large punctures. 
Elytra parallelogrammical, broadly truncated, with both angles 
of the truncature produced into sharp teeth; surface closely 
punctured, the punctures and also the lateral carina ceasing 
abruptly at three-fourths the length of the elytron ; black, basal 
third rusty testaceous. Body beneath reddish testaceous ; hind 
part of the breast dusky; abdomen black. Legs reddish testa- 
ceous ; tarsi and the hind legs black. 
S. Paulo, Upper Amazons. 
3. Amphionycha nigripennis, n. sp. 
A. elongata, parallelogrammica, ferruginea; elytris, tarsis apicibus- 
que tibiarum nigris; thorace tuberoso; elytris late truncatis, 
angulis productis ; antennis parce setosis. Long. 63 lin. 2. 
Head broad, muzzle dilated and having prominent angles, 
testaceous red, shining, and marked with a few shallow punctures. 
Antenne shorter than the body, slender and tapering to the 
extremity, very sparingly setose ; third jomt nearly twice the 
length of the fourth ; testaceous red. Thorax with a large ele- 
vated rounded tubercle on the disk, and a large obtuse one on 
each side, constricted near the anterior and posterior margins ; 
bright testacedus red, marked with a very few shallow punctures. 
Scutellum bright testaceous red. Elytra parallelogrammical, 
broadly truncated at the apex, with both angles of the truncature 
produced and acute; surface closely punctured, the punctures 
as well as the lateral carinee ceasing abruptly before the apex ; 
