166 INSECUTOR INSCITWE MENSTRUUS 



equal height ; mesostemum with two strong bristles nearly at the same 

 level. Abdomen depressed, broad basally, tapered toward apex. Wing 

 rather broad, the tip rounded ; costal vein evanescent beyond the end of 

 the third vein, very finely and closely spinulate ; subcostal vein basally 

 distinct, distally indistinct and convergent with first vein ; last section of 

 fourth vein nearly parallel with third ; posterior cross-vein slightly longer 

 than last section of fifth vein, more than its own length beyond anterior 

 cross-vein ; anal cell closed. Legs slender ; middle tibiae with short and 

 stout apical spur. 



Type of genus, Gitonides perspicax, new species. 



Gitonides is closely related to Giiona Meigen and Acletoxenus Frau- 

 enfeld. Gitona has much broader cheeks, the face distinctly keeled and 

 the clypeus large and strongly projecting. Acletoxenus differs by the 

 much nanower frons, the absence of ocellar bristles, the cheeks not visible 

 in lateral view, and the costal vein distinctly developed to apex of fourth 

 vein. 



Gitonides perspicax, new species. 



Head and thorax gray prumose with a slight brownish tinge. Abdo- 

 men banded black and whitish. Bristles and hairs black. Legs yellow- 

 ish. Wings hyaline. 



Female : Frons broad, very nearly one-third the width of the head, its 

 sides straight and nearly parallel, brown, subpruinose ; orbits narrow, pale 

 gray pruinose ; ocellar triangle small, terminating shortly beyond anterior 

 ocellus, pale gray pruinose ; orbital bristles coarse and long, inserted close 

 to eye-margin within dark brown spots ; ocellar bristles very large and 

 long, proclinate and divergent ; anterior half of frons with scattered small 

 black hairs ; on orbits, between orbital bristles, one or two setulae ; a 

 double row of about nine black setulae on frontal triangle, from vertex to 

 anterior ocellus. Eyes large, somewhat higher than broad. Face short 

 and broad, white pruinose, faintly keeled above, the oral margm not pro- 

 duced. Antennae rather short, the first and second joints ochraceous, 

 pruinose, with many black setulae, the second with a single dorsal bristle ; 

 third jomt light brown, compressed, rounded at tip ; arista slender, long, 

 microscopicaJly ciliate, pale at base, black beyond. Mesonotum gray 

 pruinose, with a few irregularly disposed, diffuse brown blotches, clothed 

 with numerous black setulae inserted in dark punctures, rather evenly dis- 

 posed but not forming distinct rows, sparser on extreme margins. Scutel- 



