116 DIPTERA OF NORTH AMERICA. [PART IV. 



Gen. XXII. FSII.OCOIVOFA. 



This* European genus being but imperfectly known by me, I 

 have to confine myself to the remarks already given about it in 

 the genus Gnophomyia (compare p. 113). 



Gen. XXIII. GONIOMYIA. 



Two submarginal cells ; the first very short, subtriangular, owing to the 

 shortness and the oblique direction of the anterior branch of the second 

 longitudinal vein (Tab. II, fig. 4, wing of G. subcinerea ; fig. 2, G. sulphu- 

 rella) ; no marginal cross-vein ; four posterior cells ; discal cell open or 

 closed ; when open, it is coalescent with the third posterior cell ; wings 

 glabrous. Antennas 16-jointed, rather short. Feet long, slender; tibise 

 without spurs at the tip, tarsi with distinct empodia. Forceps of the male 

 with several branches and linear appendages (Tab. IV, fig. 17, forceps of G. 

 blanda ; fig. 18, of G. cognatella). Ovipositor of the female slender, arcuated. 



Rostrum and palpi short ; the joints of the latter nearly of 

 equal length. The antennse, if bent backwards, would not reach 

 beyond the root of the wings ; the joints of the flagellum are 

 short subcylindrical or oval, verticillate ; in G. sulphurella the 

 basal joints in the male are strongly incrassated. The feet are 

 more or less pubescent ; sometimes this pubescence is hardly per- 

 ceptible. The wings vary in length ; they are comparatively 

 short in G. sulphurella (Tab. II, fig. 2), and longer in G. sub- 

 cinerea (Tab. II, fig. 4) and blanda. The venation has many 

 striking peculiarities ; the tip of the auxiliary vein is nearly 

 opposite the origin of the second longitudinal vein, often a little 

 before or a little beyond it ; never so much beyond it as in the 

 other Eriopterina ; the subcostal cross- vein is at this very tip (G. 

 subcinerea, cognatella, sulphurella), or quite near it (G. blanda). 

 The prsgfurca originates about the middle of the anterior margin ; 

 it is more or less arcuated ; the first submarginal cell is very short ; 

 its petiole being long and its inner end being posterior to the tip 

 of the first longitudinal vein, or at the utmost, nearly opposite 

 this tip (G. blanda)) the anterior branch -of the second longi- 

 tudinal vein is short, running obliquely towards the costa and 

 reaching it at a short distance beyond the tip of the first longi- 

 tudinal vein, or at this very tip (G. blanda) ; this course of the 

 anterior branch of the second longitudinal vein gives to the first 

 submarginal cell a triangular shape ; the marginal cross-vein is 



