168 
gular branches; the apical part is crossed by a broad black 
vitta, the apex itself being edged, as usual, with white. Body 
beneath ashy ; sides of thorax and abdomen with a broad yel- 
lowish vitta. Legs ashy, spotted with black. 
. Terminal ventral segment with each side produced into 
a long, compressed, incurved, horny lobe, the apex of which is 
obliquely truncated ; dorsal plate obtusely rounded at apex, 
Ega, rare. 
29. Colohothea naevigeraj n. sp, 
C. modice elongata, postice regulariter attenuata, nigricans, sericea, 
vertice thoraceque supra lineis duabus, elytris maculis paucis 
discretis, cinereis ; his truncatis, angulis externis spinosis. Long. 
4^7i lin. S $ . 
Head black, forehead with three ashy lines, cheeks with a 
spot of the same colour, and vertex marked with two ashy lines 
diverging on the occiput. Antennse greatly elongated and 
robust, black, sixth joint ringed with white, tenth joint with an 
exterior white line ( ), in the ? the eighth and eleventh joints 
also streaked with white. Thorax blackish, clothed with an 
olivaceous silky pile, the upper surface with two tawny-ashy, 
slender, nearly parallel lines ; sides each with a single similar 
line, besides a broader streak above the coxae. Elytra broad at 
the base, with prominent and not markedly oblique shoul- 
ders, regularly attenuated thence to the apex, which is truncated 
and has the external angles produced into spines; the surface 
has a few fine punctures surmounted by acute granulations to- 
wards the base, and beset with short black bristles ; the colour 
is blackish, clothed with silky olivaceous pile, and ornamented 
with a small number of scattered and distinct, rounded, tawny- 
ashy spots, the extreme apex having an ashy-white border de- 
creasing in width from the suture to the external angle. Body 
beneath black, thinly clothed with ashy tomentum; the sides 
of the breast have a tawny-ashy streak in continuation of the 
oneon the prothorax, and the sides of the abdomen are spotted 
with the same colour. The legs are blackish, ringed with 
grey. 
^ . Terminal ventral segment narrowed to the apex, trun- 
cated, with the angles produced into stout spines ; dorsal seg- 
ment obtuse. Legs stout ; anterior tarsi moderately dilated and 
fringed. In the smaller males the legs are not perceptibly 
thicker than in the females. 
$ . Terminal abdominal segment projecting considerably be- 
yond the apex of the elytra, broad; dorsal segment notched, 
ventral truncated, angles not produced. 
A common insect at Ega and S. Paulo, Upper Amazons. 
