CHARLES P. ALEXANDIOR 243 



bears two rather strong bristles; no chitinizecl hooks on the pleurites. 

 Ventral gonapophyse expanded into a flat oval surface on its ventral face 

 and provided with abundant rather stout black hairs. 



Holotype, cf , Bartica, January 28, 1913. 

 Allotype, 9 , topotypic, January 28, 1913. 

 Paratypes, 30 cf 9 , topotypic, December 31, 1912 to February 

 13, 1913. 



Gonomyia (Leiponeura) extensa sp. n. 



Small species (wing less than 3 mm.) : subcosta rather long, ending just 

 before the origin of Rs; pleural stripes distinct; pleurites of the hypopy- 

 gium bearing a strong, nearly straight, chitinized appendage. 



Male. — Length, 3.2 to 3.3 mm. ; wing, 2.5 to 2.7 mm. 



Female. — Length, 3.6 mm.; wing, 2.7 to 2.S mm. 



Rostrum and palpi dark brown. Antennae with the first segment black, 

 second yellow, black on the sides, flagellum brownish black. Head light 

 yellow. 



Thorax light brown without distinct darker markings; lateral margin of 

 the praescutum yellow; scutellum brownish of the anterior half, yellow be- 

 hind; postnotum yellow with a conspicuous semilunar brown mark just be- 

 hind the scutellum. Pleura brown with a broad conspicuous yellow stripe 

 beginning on the fore coxa and ending on the sternites of the abdomen. 

 Halteres brown, knob yellow. Legs, coxae yellowish, trochanters and 

 femora dark brown, tibiae and tarsi brown. Wings subhyaline, irridescent, 

 no stigmal spot. Venation: *Sc ending slightly before the origin of i?s. 



Abdominal tergites brown, broadly yellow laterally ; sternites yellowish ; 

 hypopygium yellow, the chitinized appendages black. Hypopygium with 

 the pleurites moderately long, the fleshy dorsal appendage rather short, 

 very pale, the chitinized arm strong and powerful, bent at a sharp angle 

 just beyond the base, thence extended caudad and expanded near the tip, 

 apically bearing a sharp point; dorsal gonapophyses small, inconspicuous, 

 the tips black, chitinized; ventral gonapophyses not chitinized. 



Holotype, cf , Bartica, January 11, 1913. 

 Allotype, 9 , topotypic, January 28, 1913. 

 Paratypes, 1 d^, 50 9, topotypic, December 27, 1912 to Feb- 

 ruary 13, 1913. 



Gonomyia (Leiponeura) scimitar sp. n. 



Similar to G. exteu^c , differing chiefly in the male hy})()pygium and the 

 venation. 



Male. — Length, 3.3 mm. ; wing, 2.8 mm. 



This species presents a superficial appearance that is quite similar 

 to Gonomyia extensa. In the present species subcosta ends opposite or 

 slightly beyond the origin of the radial sector. The pleural pieces of the 

 male hypopygium are short and stout, the fleshy dorsal appendage being 



TRANS. AM. ENT. SOC, XL. 



