356 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



Cephalic bristles brownish yellow; the usual garniture present. 

 The genal bristle not very distinct. 



Thorax with scutellum 1.5 (1.8) mm. long and 1.1 (1.4) mm. wide, 

 testaceous yellow; mesonotum sparsely covered with whitish pruinosity 

 and with appressed short yellowish hairs, except for the narrow shining 

 hind margin; in the whitish pruinosity there are three indistinct pale 

 brownish yellow vittae, one on median line and two laterals between 

 prescutellar and dorsocentral bristles, ending in the usual pair of 

 lateral black spots; these yellowish brown dusted vittae slightly 

 broader than space between them. On sides of mesonotum only one 

 black dot present behind wing base. Pleura sparsely white dusted, 

 only region between and around sternopleural and pteropleural bristles 

 fully shining, and mesopleura (anepisternite) dusted with testaceous 

 yellow and subshining. Pleura characteristically marked with black 

 in this species; postscutellum (except for a small anteromedian yellow 

 dot), entire mediotergite and dorsal pleurotergite, ventral pleuro- 

 tergite (except for superior margin), and adjacent lower hind part of 

 pteropleuron (anepimeron) coherently black. Sometimes inferior 

 third of pteropleuron black. Metapleura above hind coxa extensively 

 black; this large black spot is separated from the above-mentioned 

 black region by a testaceous yellow, narrow, horizontal vitta which 

 begins at the haltera base, extending over superior margin of meta- 

 pleura and of sternopleuron ; the same metapleural black spot sepa- 

 rated from the entirely black sternopleuron (katepisternite) by the 

 testaceous yellow midcoxa. 



Thoracic bristles brownish yellow and somewhat flattened; lower 

 mesopleural bristle more than two-thirds as long as upper; posterior 

 notopleural bristle but slightly shorter than anterior. Dorsocentral 

 bristle pair placed near trasverse suture, in the anterior fourth of 

 distance between suture and supra-alar bristle {sa); slightly more 

 widely spaced than prescutellar pair, which is inserted approximately 

 in hind third of distance between upper postalar and sa bristles. 



Coxae and legs entirely testaceous yellow. 



Wings with the usual pattern of the genus. Stigma 2.7 (2.9) times 

 as long as broad at the base. First costal section 0.45 (0.54), second 

 0.95 (1.16), third 0.68 (0.82), and fourth 0.41 (0.50) mm. long. Basal 

 section of the fourth longitudinal vein (Mi) 0.75 (1.02), penultimate 

 (between both cross-veins) 0.24 (0.34), and ultimate 1.11 (1.20) mm. 

 long. Inner cross-vein (0.20 (0.27) mm.) slightly more obliquely 

 placed than outer (0.43 (0.53) mm.). Anal cell with the apical process 

 together 0.54 (0.63) mm. long, and 3.8 (3.9) times as long as apical 

 process (0.14 (0.16) mm.). 



Halteres testaceous yellow. 



Preabdomen 1.4 (1.6) mm. long and 1.2 (1.5) mm. wide, shining 

 testaceous yellow, covered with appressed brownish yellow hairs; the 



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