Vol. xxv] ENTOMOLOGICAL NEWS 209 
tenne brown; front yellow; vertex brownish; occiput and gene dull 
yellow. 
Pronotum light dull yellow. Mesonotal prescutum shiny, dull yel- 
low with three very broad brown stripes which are confluent behind, 
the middle stripe beginning at the cephalic margin of the sclerite; 
scutum light brown, the middle of the lobes dark brown; scutellum 
light brown; postnotum light brown, the sides very dark, almost 
black, especially behind. Pleure yellowish, the mesopleure tinged 
with brown; a large rounded dark brown spot between the bases of 
the halteres and the wings. Halteres light yellow, knob brown. 
Legs, coxe and trochanters yellowish, femora and tibie dull yellow, 
tarsi dull yellow becoming brown on the apical segments. 
Wings subhyaline, a brown band extending from the tips of Sc and 
R down across the cord to cell 1stM2; veins brown. Venation (see 
Plate IX, figure 7): Sc long, extending beyond the cross-vein r; cross- 
vein r connecting with R2 plus 3 nearer to its origin than its tip; R2 
very short. 
Abdomen with the four basal tergites yellow with a broad, dark 
brown, lateral margin; remaining tergites dull brown; sternites, basal 
ones dull yellow, terminal four sclerites suffused with brown. 
Male—This sex shows a dark brown pleural band across the scler- 
ites; femora with a light brown tip, tibie with a distinct brown tip; 
cross-vein r about midlength of R2 plus 3 and a faint brown seam! 
along the outer end of cell 1stM2. 
Holotype, male; Allotype, female, Callanga, Peru, in the 
Hungarian National Museum. 
G. pervicax is allied to G. hirsuta Alex.13 (Brazil) in 
its peculiar venation but has only a single narrow alar cross- 
band. 
Genus Trimicra Osten Sacken. 
1861. Trimicra Osten Sacken; Proc. Acad. Nat. Sci., Phila., p. 290. 
Trimicra sp. 
One male from Asuncion, Paraguay, June, 1905. Vezenyi. 
Genus Sigmatomera Osten Sacken. 
1869. Sigmatomera Osten Sacken; Mon. Dipt. N. Am., vol. 4, p. 
137. 
Sigmatomera occulta sp. n. (PI. IX, fig. 5.) 
Wings without dark cross bands; cell 1stM2 closed. 
Female.—Length, 13.5 mm.; wing, 14.3 mm. Rostrum and palpi 
13 Alexander, Proc. U. S. Nat. Mus., vol. 44, No. 1966, p. 523, plate 
67, fig. 30 (1913). 
