SCHROTTKY] SOUTH AMERICAN HYMENOPTERA 265 
anterior femora behind and the apical part of the posterior tibiz being 
more or less fuscous; the flagellum of the antennz is ferrugineous in 
front and fuscous above. The tegule behind are pale brown. 
Wings hyaline, with fuscous nervures. The apex of the abdomen is 
ferrugineous below; the apical margins of the second and third 
segments are also sometimes ferrugineous; the second segment has 
sometimes a minute fascia of white hairs on the sides. 
Head densely, thorax coarsely punctured; the pleurze are covered 
with scattered deep punctures and short yellowish hairs; the meta- 
thorax is truncate, the truncation with a longitudinal low depression 
and fine radiating strie towards the margin; the basal space is 
punctured, a little raised, with six longitudinal furrows, the two 
median converging forming a V, the two exterior small and less 
distinct. First abdominal segment is covered with fine punctures, 
the second segment has a deep transverse depression near its base, 
from whence to its apex it is very finely punctured ; the rest of the 
abdomen is smooth and shining. Both recurrent nervures are nearly 
interstitial; the first recurrent joins the cubitus just behind the first 
transverse cubitus, the second before the second transverse cubitus. 
Taken at Villa Encarnacion, December 27 and 28, 1904. 
This species seems to be very similar to P. rugosa Smith, judging 
from his description. The differences are, however, in the color of 
the legs, the structure of the basal space of the metathorax, and of 
the abdominal segments. Some of my specimens have no fasciz of 
white hairs on the abdominal segments, nevertheless it may be but 
the Southern form of P. rugosa Smith. 
The original description, in Rev. Mus. Paul, v, p. 339, treats of 
female and male; this is a mistake, both specimens described there 
being males. I think that by direct observations it may be found 
that gracillima is the female of this species, but for the present it 
seems more convenient to consider them different species. 
6. PROSOPIS GRACILLIMA Schrottky 
1903. Prosopis gracillinea (laps.!) ScHrotTKy, Rev. Mus. Paul., v, p. 340, 
Ble cils Da eoraitienagtses oiie 
Female.—Length, 6 mm.; abdomen, 1% mm, wide; wings, 4% 
mm.; antenne, 2 mm. Black; the middle of the clypeus, a rect- 
angular small spot above it, the face on each side of the clypeus, the 
inner orbits of the eyes, the collar, the tubercles of the thorax, the 
tegulz in front, the scutellum and the base of the tibiz, are yellow; 
the mandibles, the labrum and the sides of the clypeus, are fuscous ; 
