384 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



hyaline. Subcostal cell (stigma) 2.7 (2.6) times as long as basally 

 broad. First costal section (stigma) 0.57 (0.52), second 1.34 (1.04), 

 third 0.77 (0.68), and fourth 0.48 (0.39) mm. long; basal section of the 

 fourth longitudinal vein 1.02 (0.86), penultimate 0.29 (0.23), and ulti- 

 mate 1.33 (1.09) mm. long. Inner cross-vein 0.16 (0.22) mm. long, 

 very obliquely placed and exactly parallel to outer cross-vein (0.54 

 (0.45) mm.). Fifth longitudinal vein, which posteriorly delimits dis- 

 coidal cell, only slightly excurved. Anal cell with apical process 

 0.73 (0.54) mm. long, approximately 2.7 times as long as the short 

 (0.27 (0.20) mm.) apical process. 



Halteres testaceous yellow. 



Preabdomen 1.4 (1.2) mm. long and 1.3 (1.3) mm. wide, shining 

 testaceous yellow, covered with appressed fine black hairs and marked 

 with three pairs of lateral black spots : third to fifth tergites each with 

 a pair; the black spots on third and fourth tergites transverse-oval 

 and the pair on the fifth is long and vittalike, crossing the tergite from 

 anterior to posterior margin. Fifth tergite 1.7 times as long (0.43 

 (0.41) mm.) as the fourth (0.25 (0.23) mm.). 



Postabdomen testaceous yellow; epandrium oval v/ith normally 

 shaped surstyli. 



Female: Lilve male; length of body 3.2 (3.8) mm., wing 3.1 (3.6) 

 mm. long and 1.4 (1.5) mm. broad, 2.2 (2.4) times as long as broad. 



Head 0.64 (0.70) mm. long, 1.04 (1.16) mm. wide, and 0.82 (0.91) 

 mm. high. Frons at vertex 0.45 (0.50) and at anterior margin 0.36 

 (0.43) mm. broad, and medially 0.43 (0.45) mm. long. Postpedicel 

 0.25 (0.24) mm. long and 0.15 (0.16) mm. wide, 1.7 (1.5) tunes as long 

 as wide. The three black points, each at the interior margin of the 

 ocelli, present only in the specimen from Sierra Cordoba. Eye in 

 profile 0.68 (0.75) mm. high and 0.41 (0.45) mm. wide, 1.6 (1.7) times 

 as high as wide. Genae below eyes 0.07 (0.07), inferior region of post- 

 cranium in profile 0.16 (0.17) mm. wide. 



Thorax with scutellum 1.4 (1.5) mm. long and 1.0 (1.1) mm. wide, 

 with the same markings as in the Ecuadorian male, except for the black 

 markings on sternopleuron : the black spot smaller in the Argentine 

 females, which have additionally the upper margin of pleura bordered 

 with a vittalike, narrow, short, brownish black marking. 



Wings like those of male; brown basal band is paler and more 

 abbreviated than in typical male specimen. First costal section 0.55 

 (0.57), second 0.98 (1.09), third 0.63 (0.73), and fourth 0.50 (0.50) 

 mm. long. Basal section of fourth longitudinal vein 0.73 (0.88), 

 median (penultimate) 0.27 (0.25), and ultimate 1.09 (1.18) mm. long. 

 Inner cross-vein 0.25 (0.27) mm. long and more obliquel}^ situated 

 that the outer cross-vein (0.45 (0.48) mm.), which is placed almost at 

 right angles to costa. Anal cell with apical process 0.57 (0.63) mm. 

 long, whole cell 3.1 (2.7) times as long as the apical process itself 

 (0.18 (0.23) mm.). 



