210 Timehri. 
This species, judging by the examples examined, varies as regards the yel- 
low markings. There may be a line or a spot on the apex of the clypeus, 
narrow line on the lower part of the inner orbits, there may be a thin reddish 
line on the pronotum, the apex of the post-Scutellum is broadly rounded, 
slightly dilated in the middle ; the spiracles on the petiole are at the base of 
the apical third, not near the middle as usual: the last point is a characteristic 
one with the species. 
Polybia fulvicauda, sp. n. 
Deep black, a line along the inner orbits from the end of the incision to the 
apex a broader line along the apical half of the clypeus all round and a short 
narrow line near the top of the outer orbits pale yellow, the apex of the 3rd 
abdominal segment in the centre and on the sides and the whole of the others 
bright orange and densely covered with long whitish pubescence ; wings 
fuscous violaceous, the hinder paler in tint, the nervures and stigma black. 
Female. Length 12 mm. 
The pubescence dense, short, pale. Clypeus smooth, longer than wide, its 
apex broadly rounded. Front and vertex closely, strongly punctured. 
Thorax strongly, closely punctured all over, the base rounded, the apex of the 
pronotum with a distinct keel which goes half way-down the pleure. Apex of 
post-scutellum broadly rounded, the middle smooth, with a row of large, deep 
punctures behind. Sides of metanotum broadly rounded, the middle 
depressed. Basal half of 1st abdominal segment narrowed, the apex distinetly 
roundly dilated, strongly punctured ; the 2nd segment closely, but not quite 
so strongly punctured, not much longer than wide, roundly narrowed at the 
base. 
Polybia sericea, Ol. 
Polybia chysothorax, Saus. 
Polybia nigriceps, sp. n. 
Rufo-testaceous, the head, antennaz, the centre narrowly and the sides 
broadly and irregularly of the 3rd abdominal segment,the 4th and 5th entirely, 
the 6th broadly laterally and the apical 3 ventral segments black ; wings 
fuseous violaceous, the stigma and nervures black. Female. Length 16mm. 
Clypeus as wide as long, its upper half opaque, the lower shining, sparsely 
punctured, the apex gradually narrowed to a rounded point. A narrow keel 
runs down from the ocelli to the antenne, the upper part much less distinet 
and shallower than the lower. Smooth and shining, covered with a silky 
white pile, which appears golden on the mesonotum. A fine keel runs down 
the middle of the scutellum. Apex of post-scutellum bluntly, broadly rounded. 
Metanotal furrow running from the base to the apex, the centre forming 
a fine, narrow furrow, clearly defined from the wide, oblique sloping sides, 
which are slightly narrowed towards the base. There are no furrows on the 
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