BY FREDERICK A. A. SKUSE. 823 



hairs ; obscure testaceous ; femora gradually darkening into deep 

 brown or blackish towards the tip ; extreme tip of tibiae and the 

 tarsi deep brown or blackish. Wings sub-hyaline, very slightly 

 tinged ; veins brown or blackish ; cross-veins sometimes scarcely 

 perceptibly infuscated ; stigma pale brownish. The discal cell 

 in certain specimens shows a tendency to open posteriorly ; the 

 anterior branch of fourth longitudinal vein in some instances 

 originating with a short arcuation, and the discal cell closed with 

 a pale cross-vein. 



Hah. — Sydney; abundant during August, September and 

 October (Masters and Skuse). 



Ohs. — Thomson's species, which is certainly not a Limiiohia on 

 account of its 16-jointed antennae, nor a Limnophila because of 

 its spurless tibiae, seems undoubtedly to be identical with the 

 smaller of our two common Sydney Trimicrm. 



Genus 16. Gnophomyia, O.-Sacken. 



Gnopliomyia, O. Sack., Proc. Acad. N. Sc. Philad. p. 223, 1859 ; 

 Mon. Dipt. N. Amer. IV. p. 172, t. 2. f. 5 (wing), t. 4. figs. 19 

 and 19a (forceps and ovipositor), 1869 ; Studies II. p. 198, 1887. 



" Two sub-marginal cells ; four posterior cells ; a discal cell . 

 the second longitudinal vein originates somewhat before the middle 

 of the anterior margin, a considerable distance anterior to the tip 

 of the auxiliary vein ; praefurca very slightly arcuated at the 

 basis, nearly straight; sub-costal cross-vein at a small or moderate 

 distance (hardly exceeding the length of the great cross-vein) 

 from the tip of the auxiliary vein; seventh longitudinal vein 

 nearly straight. Wings glabrous. Antennae 16-jointed. Tibiae 

 without spurs at the tip ; tarsi with distinct empodia. The forceps 

 of the male consists of two comparatively short basal pieces, and 

 a pair of claw-shaped horny appendages ; a second pair of horny 

 appendages, below the first, is shorter and stouter." (Osten- 

 Sacken). 



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