404 Mr. H. W. Bates on the Longicorns of the Amazon Valley. 
species to the common P. spinipennis of Laporte, a native of 
South-east Brazil. It does not seem very closely allied, how- 
ever, to that species. The elytra are less depressed, more thickly 
and deeply punctured on the base and disk, and less parallel- 
sided, being broad at the base and more tapering to the apex. 
In general outline it more nearly resembles P. papulosa. The 
colour above is fulvescent or tawny brown, the apical third of 
the elytra variegated with fine longitudinal streaks of a darker- 
brown hue. The bright-fulvous tarsi and the fulvous apical 
ring of the femora, contrasted with the deep-black legs, are fea- 
tures it possesses in common with P. hystricina and the follow- 
ing form, P. Paraensis. The surface of the elytra, except the 
apical portion, is studded with short obtuse spines, or, rather, 
conical tubercles ; these vary in number in different examples, 
as they do in most species of Polyrhaphis; but, as is usual in 
the genus, they are constant in position. There is a row along 
the prominent centro-basal ridge, a series of three or four along 
the suture near the middle, and two oblique rows along the 
middle of the disk, the inner one of which extends in a flexuous 
direction to the base of the elytra. Besides these spines, the 
elytra on the sides and shoulders are thickly studded with tuber- 
cles arranged in rows, each accompanied, as the spines also are, 
by a large and deep puncture. The disk of the elytra towards 
the suture is much depressed, and, with the interspaces of the 
base, is thickly punctured ; the apical third of the surface is smooth 
and impunctate. The apex of the elytra is truncated, the su- 
tural angle has a very small projecting point, the external one 
being produced into a spine. The length varies from 9 to 
15 lines. 
This species is rather common at Ega, on the trunks of fallen 
trees in the forest. It is also found on the banks of the Cupari, 
an affluent of the Tapajos. 
7. Polyrhaphis Paraensis, n. sp. 
P. oblonga, tomentosa: capite fuliginoso: thorace fulvescente : 
elytris fuliginosis, basi et pone medium cervino variegatis : elytro- 
rum tuberculis ut in P. Jansoni dispositis. Long. 10 lin. 2. 
Head and antenne sooty black, the former punctured in front. 
Thorax fulvous, the disk clouded with dusky ; the lateral spines 
straight, the dorsal tubercles acute. Elytra broad at the base, 
then gradually narrowed to three-fourths their length, whence 
they are more abruptly narrowed and rounded to the apex, which 
is truncated; the sutural angles simply pointed, the external 
ones produced into spines; the tubercles and punctures on the 
surface are arranged precisely as in P. Jansoni, but the colour is 
different ; the base is of a tawny-brown hue, the central parts 
