168 Timehri. 
striated above, the spines long and sharp-pointed. Prothorax smooth except 
for some curved striz in the middle of the apex of the pleure. Mesonotum finely, 
distinctly, but not closely punctured, the apex of the lateral lobes smooth, as 
are also the scutellums. Base of metanotum smooth, with two keels down the 
centre of the apical half. The basal half of the central half obliquely, the 
apical more transversely, strongly striated ; the apical slope is closely, regularly 
transversely striated. Meso-and metapleure smooth, densely covered with 
white pubescence. The llth to 20th antennal joints white, tinged slightly 
with rufous. 
Polycyrtus nigriventris, sp.n. 
Ferruginous, the antenne, head and abdomen from the post-petiole black, 
the clypeus, mandibles, labrum lower side of malar space, the palpi, and the 
8th to 14th antennal joints, white, wings hyaline, the stigma and nervures black, | 
the areolet a little longer than wide, slightly narrowed at the base, the recurrent | 
nervure received in the apical fourth, the transverse median nervure interstitial, 
Female. 
Length 13 m.m. ; terebra 2 m.m. 
Smooth and shining. Frontal spine longish conical, testaceous at the apex. 
Metanotal spines, conical, not very stout, longer than they are wide at the base. 
The apical slope of the metanotum bears fourirregular keels. The base and apex 
of the post-petiole, the gastroeveli and the apex of the second segment narrowly 
are dark rufous. The second and following abdominal segments are covered 
with short white hair. Four stout short keels lead down from the ocelli, the 
central two straight, the outer oblique. 
A longish slender species. 
Polycyrtus melanocephalus, sp.n. 
Ferruginous, the head entirely black, the palpi white, the antenne black, the 
scape pale rufous below, the 8th to 16th joints white they are shortly and densely 
pilose ; the mesonotum and apical segments of the abdomen are slightly darker 
coloured, wings hyaline, the stigma, costa and nervures testaceous, the stigma 
paler coloured, the areolet small, a little longer than wide, of equal width, re- 
ceiving the recurrent nervure near the apex; the transverse median nervure 
interstitial. Female. 
Length 8 m.m. ; ovipositor 2 m.m. 
Ida Sabina on the Berbice River. August. Smooth, shining. Metanotum 
and base of legs sparsely covered with fuscous hair. The hind tibie paler 
coloured than the femora, their tibie pale yellow, sparsely, shortly spinose below. 
Metanotal spines of moderate size, conical, a little longer than they are wide at 
the base. 
Polycyrtus albolineatus, sp. n. 
Ferruginous, the antenne, mandibles, the vertex, front, broadly, the occiput 
still more broadly, prothorax, mesonotum and scutellum black ; the face, clypeus, 
labrum, palpi, a line on the inner orbits, round the top to the bottom of the outer 
