46 
mentum is hoary or ashy, the elytra, with the exeeption of the 
basal and apical parts, being of a violet-brown colour. The 
shape of the elytra in this species is elongate- quadrate, being 
only slightly narrowed posteriorly, with the base and apex rect- 
angular, and the sides nearly straight. The spines on the elytra 
are as follows : — a row of small ones placed close to the suture, 
but deficient near the base and the apex ; three large ones on 
the centro-basal ridges, two on the shoulders, and five or six 
very long ones on the disk. It occurs in Guiana as well as the 
Amazon region, and appears to be a rare insect. I met with 
only one example, which was found closely adhering to a dead 
branch, and scarcely distinguishable from it on account of the 
colours resembling those of the lichens with which the wood was 
covered. 
2. Polyrhaphis liystricina* 
P. brevis, subconvexa, spinosa, tomentosa, cervino-fusca, postice 
cinereo variegata : thoracis spinis antrorsum valde curvatis : elytris 
truncatis, angulis internis acutis, externis valde productis. Long. 
12 lin. c?. 
Head scantily punctured, dull black, clothed with tawny- 
brown pile. Antennse dark brown. Thorax punctured near the 
fore and hind margins, clothed with tawny-brown pile clouded 
with dusky ; dorsal tubercles very large, obtuse ; lateral spines 
strong, elongated, and more strongly curved forwards than in 
P. spinosa. Elytra rather short, subquadrate, slightly but gra- 
dually narrowed from the base, the sides nearly straight to three- 
fourths the length, and then gradually rounded to the apex, 
which is broadly truncated ; the sutural angle very slightly pro - 
duced, and the external one armed with a stout spine : the sur- 
face is studded with stout but not long or acute spines ; there 
are five or six in a row on the strongly-raised centro-basal ridge, 
three or four along the suture near the middle, several smaller 
ones on the shoulders, and a short series of three or four between 
the shoulders and the centro-basal ridge, and, lastly, five on the 
disk, namely, two in the middle and three on the posterior part; 
the interspaces are studded with large, deep, and shining punc- 
tures, the apical portion of the elytra behind the spines alone 
being entirely smooth. Under surface of the body and legs 
black, thinly clothed with brownish pile ; tarsi and a ring at the 
tips of the femora bright fulvous. 
There is a specimen of this species in the British Museum, 
ticketed “ P. hysiricina, White, which name I have adopted ; it 
is larger and paler in colour than my example, but agrees with 
it in all other respects. It appears to be a rare species. My 
specimen was taken near Para. 
