1912] Brazilian Ichneumonide and Braconide 215 
Bracon thalessiformis sp. nov. 
Female. Length 18 mm.; ovipositor 55 mm. Black, with most of 
the ‘thorax and the first segment of the abdomen pale ferruginous. 
Wings blackish, with a pale band before and another after the middle. 
The ferruginous thorax has the prothorax black, except on its posterior 
third and the metathorax is blackish medially, in addition to a triangular 
black spot on each side before the hind coxa. The second abdominal 
segment is tinged with brown and ferrigunous along the sides and the 
venter is colored almost as the dorsal aspect. The fore wing is black at 
the base, becoming paler to the end of the submedian cell, when it is 
black to the base of the radial cell, then pale through most of the second 
cubital and finally blackish beyond to the tip. The hind wing is black- 
ish, with an incomplete pale band at the middle. Head scarcely wider 
than thick, sharply excavated behind at the middle of the occiput, the 
face receding so that it is almost horizontal. Eyes small, round, 
removed by their own diameter from the base of the mandibles; surface 
smooth and polished above and behind, sparsely punctulate on the 
cheeks. Face subshining, closely punctulate except for a small, nearly 
smooth, central portion; clypeus shining, with a complete, fine, sharply 
raised margin. Front with a shallow depressed space including the 
ocelli; antennal tubercles rather small. Antenne as long as the body; 
scape cylindrical, elongate, nearly as long as the thickness of the head; 
first flagellar joint twice as long as thick; second one-half shorter; 
remainder nearly quadrate. Palpi long, very slender, the last joint 
yellowish at tip. Prothorax smooth and shining. Mesonotum without 
parapsidal furrows, although the median portion is somewhat produced 
anteriorly. Scutellum with a narrow, smooth groove separating it at 
the base from the mesonotum. Metathorax without carinz, polished, 
smooth except for small very sparse punctures on the sides. Abdomen 
long and narrow, no wider than the thorax. First segment one-half 
wider at apex than at base, its median elevation ovate, pointed anteriorly, 
on each side of this with two smooth grooves separated by a carina 
before the raised margin; second segment one-half longer than broad; 
smooth, except that the anterior corners and the lateral margins are 
separated by a smooth groove from the central portion; third segment 
about quadrate, the anterior angles very indistinctly separated, follow- 
ing segments growing shorter; hypopygium longer than the pygidium. 
Pleurzee smooth, with a deep femoral groove extending from the fore 
coxa to the root of the hind wing and a less pronounced groove just 
external to the oval metathoracic spiracle. Legs long and rather 
slender, with the hind femora clavate. Wings with the submedian cell 
indistinctly longer than the median, recurrent nervure interstitial with 
the first transverse cubitus; first section of the radius one-fifth as long as 
the second and half as long as either of the transverse cubiti; second 
transverse cubitus with its lower half perpendicular, but strongly bent 
toward the wing tip above; discoidal vein broken at its lower two-fifths. 
Stigma black, fulvous on its lower half. 
