396 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 104 



Chi zu unterscheiden") which has the second basal cell {Chi) entirely 

 yellow. In any case the wing photograph published by Dr. A. da 

 Costa Lima does not demonstrate this character. 



It may be easily distinguished from the other species by the char- 

 acters given in the key, and principally by the arrowhead-shaped 

 apical part of the ovipositor. 



Male: Length of body 7.7 mm.; wing 7.3 mm. long and 2.6 mm. 

 wide, 2.8 times as long as wide. 



Head entirely testaceous yellow,L29 mm. long, 2.31 mm. wide, and 

 2.07 mm. high, considerably wider and higher than long. Frons at 

 vertex 1.18, at anterior margin 1.00 mm. broad and medianly 1.02 

 mm. long, about as long as broad at anterior margin and twice as 

 broad as one eye. Oral margin of mesofacial plate raised and promi- 

 nent. Cerebral plate on occiput not raised. Antennae and mouth- 

 parts testaceous yellow except for the dark brown labella; apical part 

 of broad-oval maxillary palpi slightly darkened. Postpedicel broad- 

 oval, dorsally convex, 0.34 mm. long and 0.25 mm. wide, more than 

 1.3 times as long as wide; seta bare, dark brown with golden lustre 

 except for thickened basal third, which is dark testaceous yellow; 

 three times as long as postpedicel. Eyes in profile 1.95 mm. high and 

 0.79 mm. wide (long), more than 2.4 times as high as wide and 5.7 

 times as high as genae, bare. Genae below eyes relatively broad (0.34 

 mm.), nearly as broad as inferior region of postcranium in profile 

 (0.36 mm.). 



Cephalic bristles brownish yellow and somewhat flattened: three 

 pau-s of incurved lower orbital bristles {ori), anterior pair only slightly 

 shorter; the divergent outer ventral pair and anterior pair of the re- 

 curved upper orbital bristles {ors) subequal to ori, ocellar pair slightly 

 longer. Posterior pair of ors shorter, and the slightly convergent in- 

 ner vertical pair much longer than ori. 



Thorax with scutellum 3.3 mm. long and 2.6 mm. wide, testaceous 

 yellow in ground color; mesonotum evenly covered with light yellow 

 dusting and golden shining appressed short hairs, except for the bare 

 and shining narrow posterior margin; in the specimens examined no 

 dusted vittae of different color. The usual pair of oval black spots 

 present on hind margin of mesonotum, and between them in all the 

 specimens examined a pair of smaller rounded black spots situated 

 nearer to scutellar suture than the lateral spots. On the sides of meso- 

 notum three black spots: the largest spot above wing base, a short 

 vittalike one below posterior notopleural bristle, and a smaller one 

 behind wing base; all these spots black to dark brown. Pleura with 

 no black spots. 



Thoracic bristles long, brownish yellow with golden lustre. Two 

 pairs of nearly equal, long mesopleural bristles; dorsocentral {dc) pair 

 inserted in line with supra-alars or slightly before them. Prescutellar 



