249 
found on the Isthmus of Panama, in which this part assumes 
still larger proportions*. 
9. Amphionycha concinnay White. 
Phcebe 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 lavandulee, 
disco inaculis tribus Isevibus 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. 5^-6 lin. c? . 
Ega, Upper Amazons. 
10. Amphionycha hicornis, Oliv. 
Saperda bicornis, Olivier, Entom. t. iv. 68. 27, pi. 4. f. 46. 
A. linearis, cretaceo-alba ; thorace maculis octo, elytris singulis apice 
maculis tribus, griseis ; abdomine, antennis pedibusque rufo- 
testaceis ; capite lato, fronte bicorni ; antennis corpore duplo lon- 
gioribus, longe ciliatis. Long. 5 lin. c? • 
Forests of the Tapajos. 
11. Amphionycha testacea, n. sp. 
A, cylindrica, setosa, testacea, pube fulvescente sericea induta, tho- 
racis marginibus pallidioribus ; elytris disco abdomineque basi 
fuscescentibus ; antennis tenuiter longe ciliatis, nigris, articulo 
basali (apice excepto) rufo, articulis quarto et quinto (apicibus 
exceptis) flavis ; thorace antice angustato. Long. 3^ lin. 
Head small, pale testaceous, crown darker ; face convex, pro- 
minent; upper and lower lobes of the eyes connected by a very 
slender thread. Antennje a little longer than the body, furnished 
with a scanty fringe of long straight hairs; basal joint red, 
except at the apex, which, together with the second and third 
joints, is deep black; third joint about one-third longer than 
the fourth, the latter (except the apex) and the basal half of the 
fifth pale yellow, the rest black. Thorax narrowed in front, and 
broadest in the middle; surface (except the disk) marked with 
large punctures, reddish testaceous, anterior and lateral borders 
* Amphionycha capita. Robusta, linearis, nigra, nitida ; thorace flavo, 
macula discoidali nigra. Caput magnum, convexum, corpore latius, 
nigrum, grosse punctatum, Antennee corpore longiores, nigrae, ciliatae, 
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 laevia, nigra, nitida, apice macula cinerea tomentosa. Corpus 
subtus et pedes nigra, femoribus anticis et intermediis flavis. Long, 
4| lin. 3 • Hab. in Panama. 
