134 iNSEcuTOR inscitlt; menstruus 



remainder of the legs comparatively stout, reddish brown, the 

 tips of the segments scarcely darkened, the tarsi darker 

 brown. Wings comparatively long and narrow, subhyaline, 

 the subcostal cell more yellowish ; a pale brown suffusion near 

 the middle of the wing, including cell M except at the ends ; 

 stigma dark brown ; small, paler brown dots at the origin of 

 Rs, along the cord, tips of veins Ro and R^ and less distinctly 

 on the other longitudinal veins ; a brown spot in cell 2nd A just 

 beyond midlength ; in other specimens there is sometimes a dot 

 or two near the origin of Rs, near the base of cell R and in 

 cell 1st A on a level with the end of vein 2nd A; veins dark 

 brown, Sc more yellowish. Venation : Sc ending just beyond 

 the fork of Rs, Scn at the tip of Sc^ but indistinct ; Rs long, 

 strongly arcuated to feebly angulated at origin ; r about twice 

 its length from the tip of R^ and near one-third the length of 

 ^2! ^2+3 very short to practically lacking, approximately as 

 long as r; r-m very short ; cell ist M.^ very small, subrectan- 

 gular, the basal deflection of Cmi near the middle of its length ; 

 cell Mj very narrow, a little longer than its petiole, which is 

 About twice cell ist M^ ; 2nd Anal vein slightly sinuous. 



Abdomen reddish brown, sparsely gray pruinose; a narrow, 

 dark brown median line on both the tergites and sternites. 

 Male hypopygium black, of a simple limnophiline organization, 

 the pleural appendages subequal in length, the outer appendage 

 slender, the extreme apex split into two short, acute points ; 

 the inner pleural appendage is a flattened blade with the apex 

 obtusely rounded ; gonapophyses slender, acute, diverging rods. 

 Ovipositor with the valves dark chestnut, very long and slender, 

 the acute tips strongly upcurved. 



Habitat. — New Zealand. 



Holotype, $ (from Osten Sacken's collection). 



Allotopotype, 9 . 



Paratopotypes, 7 S 9 , some broken. 



The specific name, bona, applied to this species is a manu- 

 script name of Osten Sacken's, appearing on some of the pins. 

 The fly is remarkably distinct from other New Zealand species, 

 the long, narrow wings suggesting the early stages of wing- 



