173 
surface blackish olivaceous, sprinkled with a large number of 
tawny-ashy spots, which are mostly confluent, and tend to form 
a pattern consisting of three irregular pale rings, on each ely- 
tron, enclosing a blackish space : apex edged with tawny whitish. 
Body beneath ashy, but tawny towards the sides; abdomen 
spotted with black. Legs ashy, ringed with black. 
. Terminal abdominal segment short ; ventral plate ernar- 
ginate-truncate, angles produced ; dorsal plate obtuse and 
notched in the middle. Anterior tarsi not dilated. 
$ . Terminal abdominal segment tapering ; dorsal plate 
notched in the middle ; ventral truncate, angles not produced. 
Guiana side of the Lower Amazons and banks of the Tapajos ; . 
also found at Cayenne. 
37. Colohothea concreta^ n. sp. 
C. valde elongata, angustata, olivaceo-nigra, vertice linea unica, tho- 
race vittis quatuor (quarum duabus externis usque ad oculos ex- 
tensis) fulvo-ciaereis ; elytris basi thorace vix latioribus, apice 
truncatis, angulis externis spinosis, maculis cinereo-fulvis con- 
flueiitibus dense vestitis, apice macula magna nigra. Long. 6-9 
lin. S 2 • 
Head black, forehead streaked with tawny ashy, vertex with a 
single line ; occiput on each side with a short line continuous with 
the external thoracic stripe, cheeks with a transverse stripe con- 
tinuous with the supracoxal vitta. Antennae black, sixth joint with 
a broad white ring. Thorax black, surface with four rather thick 
tawny- ashy lines, sides having only the supracoxal vitta. Elytra 
elongated, scarcely tapering ; shoulders very oblique, and not at 
all prominent ; apex truncate, external angles spinose; surface 
very thickly clothed with tawny or tawny-ashy spots, mostly 
confluent, but leaving a broad unspotted space at the apex, the 
latter margined with tawny white. Body beneath ashy, sides 
streaked with tawny ; abdomen spotted with black. Legs black, 
ringed with tawny and grey. 
. Terminal abdominal segment narrowed from the base ; 
dorsal plate deeply notched ; ventral plate semicircularly emar- 
ginated, with angles much produced. Anterior tarsi widely 
dilated and fringed. 
$ . Terminal abdominal segment elongate and much nar- 
rowed ; dorsal plate very obtuse, ventral truncated, angles 
slightly prominent. 
Para, and banks of the Tapajos. 
38. Colohothea bilineataj n. sp. 
C. valde elongata, postice vix attenuata, nigra, vertice linea unica, 
thorace lineis duabus usque ad oculos extensis, griseis ; elytris 
