of the Amazons Valley. 4.29 
thorace nigro, lateribus vitta castanea testaceo plagiata, marginis 
postici lineola et scutello albis; elytris supra planis, crebre punc- 
tatis (apice excepto), basi fulvo-brunneis, medio nigris, apice 
cinereo-sericeis. Long. 4% lin. 
Head large and convex both above and in front; mandibles 
large, strongly curved; glossy black, lower part of the face 
greyish tomentose; cheeks with a small white spot under each 
eye. Antenne a little longer than the body, filiform, finely 
fringed, black ; third joint about twice the length of the fourth. 
Thorax cylindrical, uneven, marked above with a few large 
punctures, black, sides each with a broad tawny-chestnut stripe, 
in which is a paler spot; anterior margin with two small spots ; 
hind margin in the middle with a short white line. Scutellum 
white. Elytra linear, apex rounded; surface plane, closely punc- 
tured (except near the apex); colour tawny brown near the base, 
black across the middle, ashy tomentose towards the apex, the 
colours not sharply defined. Body beneath black; breast and 
base of abdomen glossy tawny red; sides of the mesosternum 
with a white spot. Legs black. 
Ega. There is another species of large-headed Amphionycha 
found on the Isthmus of Panama, in which this part assumes 
still larger proportions*. 
9. Amphionycha concinna, White. 
Phebe concinna, White, Proc. Zool. Soc. 1856, p. 408. 
A, linearis, capite lato, albo, fronte bicorni ; thorace postice angus- 
tato, convexo, albo, supra plaga magna postica colore lavandule, 
disco maculis tribus levibus nigris ; elytris linearibus, apice trun- 
“catis (angulis externis productis acutis), colore lavandulee, apice 
fascia lata cretaceo-alba fusco bimaculata ; corpore subtus cretaceo- 
albo, sternis fuscis; abdomine, pedibus et antennis rufo-testaceis, 
his longe ciliatis, corpore duplo longioribus. Long. 53-6 lin. ¢. 
Ega, Upper Amazons. 
10. Amphionycha bicornis, Oliv. 
Saperda bicornis, Olivier, Entom. t. iv. 68. 27, pl. 4. f. 46. 
A, linearis, cretaceo-alba ; thorace maculis octo, elytris singulis apice 
maculis tribus, griseis; abdomine, antennis pedibusque rufo- 
* Amphionycha capito. Robusta, linearis, nigra, nitida; thorace flavo, 
macula discoidali nigra. Caput magnum, convexum, corpore latius, 
nigrum, grosse punctatum. Antenne corpore longiores, nigree, ciliate, 
articulis sex terminalibus flavis. Thorax capite angustior, postice 
paulo constrictus, tomento flavo dense vestitus, macula quadrata dis- 
coidali nigra. Elytra brevia, linearia, supra plana, punctata, apices 
versus leevia, nigra, nitida, apice macula cinerea tomentosa. Corpus 
subtus et pedes nigra, femoribus anticis et intermediis flavis. Long. 
4i lnm. ¢. Hab. in Panama. 
