206 



THE CANADIAN ENTOMOLOGIST. 



are five marks on successive segments. On the dorsal edge of the sternites 

 are six corresponding marks, rather less distinct than the tergal marks. 

 Hypopygium light yellow, fleshy apical appendages almost white. 



Wings : Hyaline or nearly so ; veins light brownish yellow ; very pale 

 brown clouds around the base of Rs, around cross-vein r, and in the middle 

 of cell Sc. Venation : Sc ending about opposite the origin of Rs ; Sc2 

 slightly retracted proximad of the origin of Rs, about one-half the length 



Fig, 6 — Wicg' of Gera7iomyia bezsii, sp. n, 



of Sc^. Rs moderately long, about twice the length of the basal deflection 

 of R4+5 ; cross-vein r at the tip of R^, which is abruptly upcurved beyond 

 it, very indistinct ; R^+g and R4 + 5 arcuated and parallel j cross-vein i'-i?i 

 short, pale; basal deflection of Cu^ about equal to Cug ; Cu^ fusing M 

 distad of the fork M. 



Holotype, o > lie Djerba, Tunis. (Museo Torino.) 

 Paratype, 3 (^ s, lie Djerba, Tunis. (One in Museo Torino, two in 

 Cornell University.) 



Remarks : Some venational variation occurs in the paratypes. In 

 some SC3 is exactly opposite the origin of Rs, and Scg is only a little shorter 

 than Sci ; basal deflection of Cuj at the fork of M, or even slightly 

 proximad of it. (See figure.) The relative length of Cug and the basal 

 deflection of Cu^ varies somewhat, Cug, however, being generally a little 

 the shorter. 



Key to the Pal œ arctic Gerafwmyiœ : 



1 . Wings unspotted (No Palaearctic species). 



Wings spotted 2. 



2. Thoracic dorsum without distinct stripes 3. 



Thoracic dorsum with distinct stripes 4. 



3. Antennae and palpi yellowish brown ; femora and tibiae black at 



tip atlaniica Woll.^ 



I. Wollaston — Ann. Mag. Nat. Hist., ser. 3, I, p. 115 (as Limnobiajy (1858). 



