354 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



Cephalic bristles brownish yellow, relatively short and somewhat 

 flattened. Four pairs of incurved lower orbital bristles on both sides, 

 the three anterior pau's about equal in length; the posterior pair much 

 weaker and one half as long as the others. Two pairs of recurved upper 

 orbital bristles, the anterior pair slightly longer but much stronger, 

 the posterior pair slightly shorter and weaker than the anterior 

 pairs of ori. The convergent inner vertical bristles {vti) almost as 

 long but much stronger than the ©cellars. The divergent outer 

 vertical pair the longest of the head bristles, slightly longer but weaker 

 than the vti, an exceptional character. A distinct pair of genal 

 bristles present. 



Thorax 1.8 mm. long and 1.4 mm. wide; mesonotum uniformly 

 testaceous yellow, densely covered with short appressed brownish 

 yellow hairs, except for shining posterior margin behind prescutellar 

 bristles. Only one pair of black spots, each between the upper postalar 

 and prescutellar bristles. Pleura pale ochraceous yellow, with lower 

 region more testaceous yellow, without black spots, except a pointlike 

 dot beneath base of wing; on inferior part of ventral pleurotergite 

 above hind coxa and below bristle on sternopleura only reddish yellow 

 spots present. Postscutellum and mediotergite shining testaceous 

 yellow, opaque, without black spots. If we do not consider the modi- 

 fied wing pattern, this species belongs to the obliqua group. Scutellum 

 shining ochraceous yellow with some brownish hairs at hind margin. 

 Postscutellum entirely yellow. 



Thoracic bristles brownish yellow; only the upper mesopleural 

 bristle present and well developed; the posterior notopleural bristle 

 much weaker than, and nearly half as long as, anterior; dorsocentral 

 bristle inserted in anterior third of distance between transverse suture 

 and supra-alar bristle; the apical pair of scutellar bristles convergent 

 and crossed. 



Coxae and legs without exceptional characters, ochraceous yellow, 

 with bristles and hairs (including the anterodorsal row of rather 

 loosely placed, relatively short bristles of hind tibiae) yellow. , 



Halteres ochraceous yellow. ^ 



Wings with the general pattern of the genus, but with apical band 

 at anterior margin of wing separated at apex from first posterior cell, ; 

 which is broadly connected with the next (subapical) band ; the black | 

 dot of humeral cross-vein absent; second basal cell almost entirely 

 hyaline; only basal part of basal band represented, forming a small 

 diffuse transparent light brown spot on each side of anal vein; very 

 characteristic is an opaque dark brown V-shaped marking in marginal j 

 cell above stigma, marking bifurcation of subapical and median bands; [ 

 stigma 2.4 times as long as wide basally. First costal section 0.59, 

 second 1.27, third 0.66, and fourth 0.34 mm. long; first section of the I 

 fourth longitudinal vein 1.18, penultimate 0.33, and ultimate 1.00 mm. 



