of the Amazon Valley. 403 
specks and clouds of a dark-brown hue. The fore tarsi in the 3 
are feebly dilated and fringed, and the antennz in the same sex 
are nearly twice the length of the body. 
I met with the species on the banks of the Tapajos and at 
Ega. The examples found do not differ from the Cayenne spe- 
cimen which I saw in M. Buquet’s collection. The insect is 
found on the trunks of fallen trees in the virgin forest. Like 
many other large species of Longicornes, it comes abroad at 
night, and flies over broad rivers. I once found an individual 
along with many other dead or half-dead insects on a sand-bank 
in the middle of the Tapajos, which had been cast ashore after 
falling into the water during a squall in the night. 
4. Polyrhaphas gracilis, n. sp. 
P. elongata, angustata, subconvexa, tomentosa, violaceo-fusca : 
thoracis lateribus elytrisque postice flavo variegatis: elytrorum 
apicibus rotundato-truncatis, angulis externis spinosis. Long. 
8 lin. @. 
Head clothed with reddish pile, sides black ; front coarsely 
punctured ; muzzle short. Antenne the length of the body, 
dull brown. Thorax punctured, reddish in colour, the sides be- 
hind varied with yellowish ; the two dorsal tubercles small; the 
lateral spines long, slender, and slightly bent forwards. Scu- 
tellum yellowish. LElytra narrow, much elongated, and some- 
what convex, gradually increasing in breadth from one-third to 
two-thirds ther length, then slightly narrowed to the apex, 
which is obliquely and obtusely truncated, the external angle of 
the truncation produced into a spine ; the basal half of the sur- 
face is thickly granulate-punctate, the apical portion entirely 
smooth ; the colour is a dull-reddish or violet brown, the smooth 
posterior portion being varied with ashy yellow. The body be- 
neath and legs are black, thinly clothed with ashy pile. 
I only obtained one example of this small and elegantly shaped 
species, which was taken at Ega, on a dead branch. 
5. Polyrhaphis papulosa, Olivier. 
Cerambyx papulosus, Oliv. Ent. iv. 72, pl. 20. f. 156. 
This fine species is found at Cayenne and, according to Erich- 
son (Consp. Ins. Peruana) in the forest region of Eastern Peru. 
My only example, a 2, 15 lines in length, was taken on a slender 
dead branch in the forest at Ega—a locality midway between the 
two regions. 
6. Polyrhaphis Jansoni, Pascoe. 
Polyrhaphis Jansoni, Pascoe, Trans. Ent. Soc. Lond. v. n. s. pt. 1. 
Mr. Pascoe, in the description referred to above, likens this 
