of the Amazons Valley. 105 



merosis cinereo-ochraceis in seriebus subordinatis, spatio lato api- 

 cal! immaculato ; thorace absque tuberculis. Long. 8|- lin. $ . 



Head black ; forehead with three slender lines, vertex with 

 two divergent lines, and cheeks with a broad streak tawny ashy. 

 Antennae stout, black, sixth joint with a broad white ring, tenth 

 joint with an ashy streak on one side ( ? ). Thorax not con- 

 stricted at the base, broadest at its basal angles, and free from 

 tubercles ; surface black, with two moderately thick tawny lines, 

 sides each with a similar line, not visible from above, and a 

 broad tawny vitta above the coxa. Elytra moderately broad at 

 the shoulders, and narrowed thence to the apex, the latter trun- 

 cated, with the outer angles spinose ; surface olivaceous black, 

 marked with a large number of tawny spots, which are in some 

 examples arranged in rows, and in others more or less confused j 

 there is a broad immaculate space at the apex, and the apex 

 itself is broadly margined with white. Body laeneath black, 

 thinly clothed with ashy pile, and having a broad, distinct, 

 ochreous lateral vitta. Legs blackish, ringed with grey. 



? . Terminal abdominal segment elongated and tapering ; 

 • dorsal plate broadly notched ; ventral truncated, angles acute. 

 Banks of River Tapajos ; rare. 



34. Colohothea octolineaia, n. sp. 



C valde elongata, postice attenuata, olivaceo-nigra, vertice linea 

 unica, genis utrinque lineis duabus cinereis ; thorace lineis tenui- 

 bus cinereis octo, quarum quatuor dorsalibus ; elytris humeris 

 prominentibus, maculis cinereis discretis irregulariter dispersis. 

 Long. 7^-11 lin. d$. 



Head black, forehead with two greyish lines, vertex with a 

 single narrow line, and cheeks on each side with two oblique 

 greyish lines. Antennse black, sixth joint thickened, with a ring 

 of dense white hairs in both sexes. Thorax marked with eight 

 slender, greyish or tawny lines, of which four are on the upper 

 surface and two on each side, including the supracoxal streak, 

 which in this species is slender, like the other lines. Elytra 

 greatly elongated; shoulders very prominent, then&e gradually 

 narrowing to the apex, the latter truncated, with outer angles 

 spinose ; surface olivaceous black, marked with a moderate num- 

 of larger and smaller spots, widely separated from each other, 

 but very irregularly dispersed ; apex edged with whitish . Body 

 beneath black, marked with ashy or tawny streaks and spots. 

 Legs black, ringed with tawny and grey. 



^ . Terminal abdominal segment narrowed from the base ; 

 apex of both dorsal and ventral plates emarginate-truncate. 

 Anterior tarsi very broady dilated and fringed. 



Aim. S^ Mag. N. Hist. Ser. 3. Vol. xvi. 8 



