CHARLES P. ALEXANDER 281 



bruvvn, scutolluiii and postnotura reddish yellow. Pleura light yellow, un- 

 marked. Ilalteres pale throughout. Legs, coxae and trochanters yellow, 

 the femora, tibiae and tarsi light brown. Wings yellowish hyaline with 

 two broad dark brown bands, the first occupying the basal portion, the 

 second the region of the cord and completely traversing the wing. Costa 

 very strong, veins brown. Venation: see pi. Ill, fig. 5. 



Abdomen reddish yellow, the seventh segment brownish black. 



Female: Abdomen unicolorous; the dark brown spots on the scutal lobes 

 not very evident. 



Habitat.— Biwtka, December 5, 1912 to February 20, 1913, the 

 latter taken in deep swamps. Mallali, March 8 to 19, 1913. 

 Described from 13 specimens, Gcf , 4 9,3 broken. 



Holotype, d', Mallali, March 14, 1913. 



Allotype, 9 , topotypic, March 8, 1913. 



Paratypes, ScT 3 9,3 broken, Bartica, December 5, 1912 to 

 February 20, 1913; Mallali, March. 



Genus STYRINGOMYIA Loew 

 1845. Styrhigumyia Loew, Dipt. Bcitr., i, 6. 

 Styringomyia americana sp. n. 



Mesonotum pale medially, darker on the sides; fore legs banded, hind 

 legs unhanded. 



Male. — Length, 5 mm. ; wing, 3.6-4.2 mm. 



Rostrum and palpi yellowish brown, .\ntennae with the basal segments 

 brown, the flagellum a little brighter colored. Head light reddish brown. 



Pronotura pale on the dorsal median line, more brown laterally. Meso- 

 notalpraescutum rather pale medially, this mark broadest behind near the 

 suture, sides of the praescutum and the scutum reddish brown, shining. 

 Pleura dull yellowish. Halteres short, pale. Legs with the coxae and 

 trochanters light yellow, the fore femora yellow with three brown bands, 

 narrower subbasal and subapical ones and a broader medial one; tibiae 

 yellow, broadly brownish beyond the base and before the middle, the tip 

 narrowly browned; tarsi yellow, the last segment brown. Hind legs 

 entirely light yellow, unmarked except the brown last tarsal segment. 

 Wings tinged with light yellow, the crossvein r-m slightly suffused with 

 brown. Venation: see pi. IV, fig. 1. 



Abdominal tergitcs light yellowish, the apical fourth dark brown, the 

 sternites yellow; hypopj'gium crushed. 



//afejta^.— Mallali, March 8, 1913. 

 Holotype, cf, Mallali, March 8, 1913. 

 Paratype, sex? topotypic, on the same date. 



Genus ATARBA Osten Sacken 

 1869. .4(ar6o Osten Sacken, Mon. Dipt. X. .\m., iv, 127. 



TB.\NS. AM. ENT. SOC, XL. 



