362 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



positor testaceous yellow, translucent with silky lustre, long- 

 triangular in shape with narrowly rounded normal tip. 



Male: Unknown. 



Types: Holotype 9 (USNM 61719), Paraguay, Villarica, May 

 1939, F. Schade. 



Tomoplagia incompleta (Williston) 



Figures 99,h-m; 102,l,m; Plate 22, figure 12 



Trypeta incompleta Williston, 1896, p. 378. 

 Tomoplagia incompleta (Williston), Hendel, 1914, p. 35. 



Easily distinguishable by the modified wing pattern, in which 

 respect it is very similar to argentiniensis; by the black marldngs of 

 the fifth abdominal tergite of male it seems to belong to the unifascia 

 group. 



Male: Length of body 3.8 (4.1) mm.; wing 3.4 (3.7) mm. long 

 and 1.5 (1.6) mm. broad, approximately 2.3 times as long as broad. 



Head pale ochraceous yellow except for the densely white pruinose 

 mesofacial plate and genae which are brownish below eyes; 0.68 

 (0.67) mm. long, 1.02 (1.17) mm. wide, and 0.88 (0.86) mm. high. 

 Frons at vertex 0.50 (0.50) and at anterior margin 0.36 (0.37) mm. 

 broad, and medially 0.43 (0.43) mm. long; ocellar plate very slightly 

 raised. Antennae ochraceous to testaceous yellow, maxillary palpi 

 whitish yellow, slightly curved and with widely rounded apex; labella 

 testaceous yellow. Postpedicel long-oval, 0.25 (0.26) mm. long and 

 0.16 (0.16) mm. wide, 1.5 (1.6) times as long as wide; seta bare, shining 

 black, except for the testaceous yellow, thickened basal fourth, more 

 than twice as long as postpedicel. Eyes in profile 0.77 (0.77) mm. 

 high and 0.48 (0.46) mm. wide, 1.6 (1.7) times as high as wide. 

 Inferior margin of cerebral plate only slightly raised, invisible in 

 profile. Genae below eyes 0.08 (0.07), inferior part of postcranium 

 in profile 0.17 (0.19) mm. wide. 



Cephalic bristles brownish yellow; the usual garniture present. 

 Anterior pair of lower orbital bristles (ori) considerably reduced in 

 male, while in female only slightly shorter than posterior pairs; in 

 male subequal to posterior pair of upper orbital bristles (ors) or 

 slightly longer; the two posterior pairs of ori are subequal in length 

 to anterior pair of ors; outer vertical bristles slightly longer than 

 these and subequal to ocellar pair. Genal bristle brownish black, 

 indistinct among the genal hairs of the same color. 



Thorax with scutellmn 1.5 (1.6) mm. long and 1.3 (1.4) mm. wide, 

 ochraceous to testaceous yellow in ground color; mesonotum, except 

 for the shining hind margin, sparsely and evenly covered with white 

 pruinosity and very short appressed hairs; no dusted vittae present. 

 The usual pair of brownish black spots marks the hind region of 



