CHARLES P. ALEXANDER 246 



vein r just before the fork of /fj+a, R rather long, running panillcl to Ri, Ri 

 with its tip swung caudad toward the wing-tip so that cell H2 is very wide 

 at its distal end; cell tsl J/j narrowed at its base; basal denection 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. 



Ilolotype, 9 , Bartica, January 28, 1914. 



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



This species may be easilj' separated from the other black forms 

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

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

 considerabl}' shorter than the latter vein and consequently cell Ri 

 is verj- wide at its outer end. 

 Gnophomyia subhyalina Alexander 



1913. On ph Jtiyia .fubhyalinn Alexander, Troc. l". S. Xat. I\lu8., xliv, 

 523, pi. CO, f. 23. 



Fourteen specimens 60^, 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 R^. 



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



Mnle. — Head lacking. 



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

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

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

 \\ ings light brown, diversified with darker and lighter spots and drops as 

 follows: a subhyaline patch in cell iSci just at the end of vein Sc, other 

 light marks in cell R.Snd Ri,at the end of vein Ri, in cells Isl and 2nd Mz, etc. 

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

 cross-vein r (stigmal), along the cord, at the tip of flj, and Rs, a seam along 

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

 of Cti,. base of the outer deflection of A/j and on cross-vein m. Venation r 

 (see pi. III. fig. 8) a supernumerary cross-vein in cell Ri, cell tal Mi very long, 

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

 tion of A/j. 



Abdomen dark brownish black, the hypopygium slightly brighter, more 

 reddish. 



Habitat.—MaWaW. March 1.5, 1913. 



Holotype, d', Mallali, March 15, 1913. 



This species is not a typical member of Gnophomyia in the posi- 



TRANS. AM. E.NT. SOC, XL. 



