CHARLES P. ALEXANDER 245 



vein r just before the fork of TJ^+a, R rather long, running parallel to Ri, R» 

 with its tip swung caudad toward the wing-tip so that cell Ri is very wide 

 at its distal end; cell Id M2 narrowed at its base; basal deflection of Cui 

 just before the fork of M. 



Abdomen dark grayish black, the end of the abdomen and the ovipositor 

 being drawn out into a long slender tube. 



Habitat. — Bartica, January 4 to 28, 1913. 



Holotype, 9 , Bartica, January 28, 1914. 



Paratype, sex indeterminable, topotypic, January 4, 1913. 



This species may be easily separated from the other black forms 

 with dark halteres (luduosa Osten Sacken, maestitia Alexander, et al) 

 in the divergence of veins R2 and R3 at their tips, the former being 

 considerably shorter than the latter vein and consequently cell R2 

 is very wide at its outer end. 

 Gnophomyia subhyalina Alexander 



1913. Gn ph myia subhyalina Alexander, Proc. U. S. Nat. Mus., xliv^ 

 523, pi. 66, f. 23. 



Fourteen specimens Gcf', 89, taken at Bartica, December 18, 

 1912 to February 25, 1913; mostly attracted to light, a few in the 

 swamps. 



Gnophomyia decisa sp. n. 



Color black; legs light yellow; wings light brown diversified with hyaline 

 and brown; a supernumerary cross-vein in cell Rz. 



Male. — Length, without the head, 3.9 mm. ; wing, 4.7 mm. 



Male. — Head lacking. 



Thorax including the pleura black. Halteres rather slender, brown. 

 Legs with the coxae bark brown, trochanters dull yellow, femora and tibiae 

 dull yellow, the latter a little darkened toward the tip, the tarsi brown. 

 Wings light brown, diversified with darker and lighter spots and drops as; 

 follows: a subhyalino patch in cell Sc\ just at the end of vein Sc, other 

 light marks in cell R,2nd Ri, at the end of vein Ri, in cells 1st and 2nd M2, etc. 

 Dark brown marks in the base of cell R, at the origin of Rs, end of Sc, around 

 cross- i^ein r (stigmal), along the cord, at the tip of R2, and R3, a seam along 

 the supernumerary cross-vein in cell R2, seams along the basal deflection 

 of Cui, base of the outer deflection of Ms and on cross-vein ?«. Venation: 

 (see pi. Ill, fig. 8) a supernumerary cross-vein in cell R2, cell !si A/j very long 

 and narrow so that cross-vein m is beyond the middle of the outer free por- 

 tion of A/s. 



Abdomen dark brownish black, the hyt)oin'giuin slightly brighter, more- 

 reddish. 



Habitat.—MaWaVi, March 15, 1913. 



Holotype, cf , Mallali, March 15, 1913. 



This species is not a typical meml)er of Gnophomyia in the posi- 



TRANS. AM. ENT. SOC, XL. 



