BY FREJJERICK A. A. SKUSE. 825 



small before origin of second longitudinal vein, second larger, ill- 

 defined, preceding the cross-veins, third a narrow shortened 

 cross-band from tip of second longitudinal vein ; in ^ fuscous, with 

 a distinct spot and two fasciae situated as in ^J, the latter 

 stretching almost across the wing, anal angle more or less sub- 

 hyaline ; stigma not noticeable ; veins dark. . Auxiliary vein 

 reaching costa about midway between origin of second longitu- 

 dinal and marginal cross-vein ; sub-costal cross-vein situated 

 before its tip a distance J longer than great cross-vein ; prsef urea 

 straight, very slightly arcuated at base ; marginal cross-vein at 

 or a little beyond inner end of sub-marginal cell, sometimes not 

 far from tip of first longitudinal ; petiole of first sub-marginal 

 cell about length of distance between tip of prsefurca and small 

 cross-vein ; cross- vein closing inner end of discal cell usually 

 almost obliterated ; great cross-vein situated more or less beyond 

 inner end of discal cell. 



Hah. — Australia (Lotz., 1834, Vienna Mus.) ; Sydney (Eugenia 

 Exp.) ; several localities in N.S.W. (Masters and Skuse). Sep- 

 tember to January. Twenty-five male and twelve female speci- 

 mens are before me. 



Ohs — I had already referred Thomson's species to Gnophomyia 

 when I discovered that Baron O.-Sacken had described the (J as 

 another species under this generic title. The Baron also describes 

 in the same paper (^Studies II. p. 199), a species of Gnophomyia 

 from Amazon River which he calls y«sci/?enms, but this name being 

 pre-occupied I would suggest that Osten-Sackeni be substituted 

 in honour of the describer. 



Genus 17. -Gonomyia, Megerle. 



Gonomyia, Meg., in litt., Meigen, Syst. Beschr. I. p. 146, 1818; 

 Taphrosiaj Rondani, Prodr. I. 1856 ; Gonomyia^ O.-Sacken, Proc. 

 Acad. Nat. Sc. Philad. III. p, 229, 1859 ; Goniomyia (amended 

 name), O.-Sack., Mon. Dipt. N. Amer. IV. p. 176, pi. ii. figs. 2 



