Vol. XXv] ENTOMOr.OGICAL NEWS SOQ 



tennae brown; front yellow; vertex brownish; occiput and penx dull 

 yellow. 



Pronotum light dull yellow. Mesonotal pr?esciitum shiny, dull yel- 

 low with three verj' broad brown stripes which are confluent behind, 

 the middle stripe beginninf; 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. Pleur.T yellowish, the mesopleurse tinged 

 with brown ; a large rounde<I dark brown spot between the bases of 

 the halteres and the wings. Halteres light yellow, knob brown. 



Legs, coxse and trochanters yellowish, femora and tibix 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 ISIM2; 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. 



^fa!c. — This sex shows a dark brown pleural band across the scler- 

 ites ; femora with a light brown tip. tibiae with a distinct brown tip ; 

 cross-vein r about midlength of R2 plus 3 and a faint brown seami 

 along the outer end of cell istM2. 



Holotype, male; Allotype, female, Callanga. Peru, in the 

 Hungarian National Museum. 



G. pervicax is allied to G. hirsuta Alex." (Brazil) in 

 it.s peculiar venation but has only a single narrow alar cross- 

 band. 



Genus Trimicra Osten Sacken. 



1861. Trimicra Osten Sacken; Proc. Acad. Nat. Sci., Pliila.. p. 200. 

 Trimicra sp. 



One male from Asuncion, Paraguay, June, 1905. \'czenyi. 



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 tstMi closed. 



Female. — Length, 13.5 mm.; wing, 14.3 mm. Rostrum and palpi 



" Alexander, Proc. U. S. Nat. Mus., vol. 44, No. 1966, p. 523, plate 

 67, fig. 30 (1913)- 



