382 PROCEEDESTGS OF THE NATIONAL MUSEUM vol. io4 



Male: Length of body 3.5 (3.0) mm.; wing 3.9 (3.3) mm. long and 

 1.6 (1.4) mm. wide, 2.4 (2.3) times as long as wide. 



Head entirely testaceous yellow, 0.59 (0.52) m.m. long, 1.04 (0.93) 

 mm. wide and 0.79 (0.72) mm. high. Frons at vertex 0.45 (0.43) and 

 at anterior margin 0.36 (0.29) mm. broad, at median line 0.43 (0.36) 

 mm. long. A minute black point at interior margin of each ocellus. 

 Oral margin of mesofacial plate raised and slightly prominen t. Inferior 

 region of cerebral plate raised ard in profile slightly prominent. 

 Antennae and mouthparts testaceous yellow, maxillary palpi slightly 

 curved, with broadly rounded apex. Postpedicel broad oval, 0.20 

 (0.18) mm. long and 0.15 (0.14) mm. wide, about 1.3 times as long as 

 wide; seta bare, shining black, except for the yellow basal fourth; 

 seta 2.5 times as long as postpedicel. Eyes in profile 0.68 (0.59) mm. 

 high and 0.34 (0.38) mm. wide, 2.0 (1.6) times as high as wide; inferior 

 region of postcranium in profile 0.17 (0.11), genae below eyes 0.07 

 (0.07) mm. wide. 



Cephalic bristles brownish yellow; three incurved lower orbital 

 bristles (oH), anterior pair slightly shorter; two recurved upper orbital 

 bristles, anterior subequal to, posterior shorter than, ori. The diver- 

 gent outer vertical bristles subequal to the divergent and proclined 

 ocellar bristles in length, and longer than ori; inner vertical bristles 

 slightly reclined and convergent. 



Thorax 1.6 (1.4) mm. long and 1.2 (1.0) mm. wide, testaceous 

 yellow in ground color; mesonotmn evenly covered with pale brass- 

 yellow dusting and with pale yellow thickish and short appressed 

 hairs, except for the bare and shining posterior margin; mesonotum 

 without structural, or pruinose, vittae of different color. Only the 

 usual pair of lateral black spots present on hind region of mesonotum; 

 behind (and beneath) wing base a black point. Mesopleuron (anepis- 

 ternum) shining in all specimens examined; sternopleuron in the 

 typical specimen shinmg black, except for the narrow upper margin; 

 in the Ecuadorian specimen a longish, triangular, shining black spot 

 below sternopleural bristle on hind margin of sternopleuron; in both 

 specimens a long-oval spot above hind coxa and another spot on 

 inferior region of pleurotergites (at the haltere base), both brownish 

 black. Scutellum shining yellow with some appressed brown hairs 

 on sides; postscutellum yellow with a pair of triangular lateral black 

 spots; metanotum shining reddish yellow with some blackish markings 

 irregular in shape. 



Thoracic bristles brownish yellow; only upper mesopleural bristle 

 present in all specimens. The hind notopleural bristle only half as 

 long as forebristle and much weaker; dorsocentral pair situated in 

 anterior fourth of distance between transverse suture and supra-alar 

 bristle and slightly wider spaced than prescutellar pair, which is 

 inserted far before line of upper postalar bristles. 



