20 PROCEEDINGS OF THE NATIONAL MUSEUM vol.78 



Wing slightly brown, first posterior cell as wide as submarginal ; 

 second vein shorter than usual, the tip nearer the base than anterior 

 end of hind crossvein. 



Female. — Abdominal segments two and three as in the male: 

 fourth segment brown, almost as wide as third and a little longer, 

 its apical half or more bare, of soft appearance and corrugated 

 lengthwise; this peculiar area is wider in the middle than at the 

 sides. Fifth segment rapidly narrowing, dark brown in color. Ovi- 

 positor longer than remainder of the abdomen, its short basal seg- 

 ment dark yellow, principal segment black, terminal segment dark 

 brown, yellow at base and tip. 



Length, male 5 mm., female 3.7 mm. to ovipositor, which is 2 mm. 



Described from six males and three females, Kartabo, British 

 Guiana, received from Canadian National Collection, to which the 

 type is returned. 



Paratype.—M.Q\Q, Cat. No. 43028, U.S.N.M. 



STYLOGASTER FASCIATA, new species 



Male. — Front not quite so wide as in stylata., the frontal triangle 

 brown, extending to the middle of the front, where it is not very 

 sharply defined; remainder of front brown except silvery orbits 

 ascending from the face for a short distance. Second antennal joint 

 brown, third reddish but broadly brown above and at tip, almost 

 three times the length of the second. Dorsum of thorax black, a 

 broad brown stripe extending from notopleural suture down across 

 mesopleura and sternopleura, including all the lower part of the 

 latter. Humeri pale yellow, hind part of mesonotum brownish 

 yellow. Scutellum brown, its sides more yellowish. Metanotum 

 with a distinct black spot not as wide as the first abdominal segment. 

 Humeral 1; notopleural 1; supraalar 2. 



Abdomen dark brown, the first segment white at the sides with 

 only white lateral bristles; second segment with a very narrow 

 white pollinose basal crossband and only white lateral bristles; 

 third, fourth, and fifth segments w^ith white pollinose basal cross- 

 bands occupying about one-third of the segment ; pale hairs on sides 

 of fifth conspicuous; seventh segment dark yellow. Front coxae 

 Avith inconspicuous mixed light and dark hairs at tip. 



Front and middle legs pale yellow, tarsi a little darker toward 

 tip. Hind femora with two wide blackish annuli and without any 

 erect pile on the inner side, hind trochanters bare. Hind tibiae 

 yellow at base, dark brown in the middle, then slightly enlarged and 

 white nearly to tip, the extreme tip being black ; there are no villous 

 hairs on the tibiae ; hind tarsi entirely black. 



Wings slightly infuscated, first posterior cell a little wider in the 

 middle than the submarginal cell just before it. The second vein 



