SCHROTTKY] SOUTH AMERICAN HYMENOPTERA 261 
PreeVictaOLaxatmOne: OL ESS MLUMCATC. «co.cc sic ceulciclerc ce ticeares corse. cee 12. 
Metathorax rounded, the horizontal and vertical, parts not separated, uni- 
fo Guay ep Ut CHUREA ae sepesiiele Eetatio oie sis Sloe d te esr 6 10. paraguayensis 6. 
72. (WNAIER “UNGINING Ro ets Scan coca on ecSiod BAR DEE OCCA eee ean ear pee 13. 
ME With ate PMSEONS  CLOMM oo ioc ott kon) aie dsalepa ae’ esie 5.2» 11. cockerellt, 
ieee evellows Spot above the ClYpeUS... occ. cece ccs sau svc ce eee bs ae sinless 14. 
No yellow spot above the clypeus..:....5..5.......0000.- 12. culiciformis. 
14. Smaller; spot above the clypeus pentagonal; the metathorax less dis- 
ACE VMSCULMELIHe Ci eye, se pacuyec ee eee wins sions oars wie iake ate ote a daiinse Bololnne 8 Tee 
Larger; spot above the clypeus almost rectangular; the metathorax more 
strongly sculptured, the first recurrent nervure interstitial....13. tristis. 
15. The yellow color of the clypeus and the face at its side, not interrupted ; 
punctures on mesonotum scattered, the first recurrent nervure ite 
EUS U tial eet eee iye ciieve orhare caste ene eriose eee eke circ tattle 14. xanthocephala. 
The yellow color of the clypeus and the face on its side interrupted by a 
narrow black line; punctures on mesonotum very dense, first recurrent 
nervure received by the first cubital cell................ 15. longicornis. 
1. PROSOPIS PETROSELINI new species 
Male—Length, 6% mm.; abdomen, 1% mm. wide; wings, 4% 
mm.; antenne, 244 mm. Black; the clypeus, a trapeziform spot 
above it, the face at the sides of the clypeus, and the inner orbits of 
eyes nearly to their summit pale yellow; antenne ferrugineous ; 
scutellum, the tubercles of the thorax and a small spot upon the 
tegule bright yellow; apical margin of the first abdominal segment 
on the sides with a line of small white hairs, the apical margin of | 
the other segments fringed with inconspicuous white hairs. The 
tibiz of the anterior legs are honey-colored, with a black longitudinal 
stripe outside, extreme apex of the femora and base of the tarsi 
honey-colored, the rest fuscous. Middle legs: tibiz at their extreme 
base and apex, pale ferrugineous; hind legs with the tibiz at their 
base pale yellow about one-fourth of their length; the rest black. 
Wings hyaline, with a fuscous cloud occupying the apical half of the 
median, the first cubital and the whole marginal cell, extending 
beyond to the apex of the wing. 
Head densely punctured; pronotum with two indistinct ferru- 
gineous spots; mesonotum coarsely punctured; pleurz with scattered, 
deeply impressed punctures, metathorax opaque, truncate, covered 
with very small pale hairs ; the basal space enclosed by distinct carinz, 
smooth, in the middle with three short longitudinal carinz; first 
abdominal segment in the middle strongly punctured, the punctures; 
becoming finer towards the sides; second segment much more finely- 
punctured, deeply depressed at its base; the punctures on the follow-- 
ing segments are not more distinguishable. Wings: The second 
