BY FREDERICK A. A. SKUSE. 783 



deep brown or black, sparingly clothed with very short yellowish 

 hairs ; ^ forceps (PI. xxiv., fig. 51) concolorous with rest of body ; 

 ^ ovipositor rather slender, slightly curved, the valves reddish- 

 brown. Legs obscure testaceous; femora with a broad ring of brown 

 at tip; tibiae and first two tarsal joints slightly tipped with, and three 

 last joints entirely, brown or black. Wings pellucid, with brownish 

 tint ; veins dark fuscous-brown, the prsefurca and cross- veins 

 clouded with brownish ; costal cell, and distal half of marginal cell, 

 also brownish ; stigma small, round, dark fuscous, enveloping the 

 tip of first longitudinal and marginal cross-vein. Auxiliary vein 

 reaching costa opposite inner end of sub-marginal cell ; sub-costal 

 cross-vein close to its tip ; first longitudinal vein abruptly arcuated 

 into the second, joined to the costa by the cross-vein ; the latter 

 rather indistinct and pale; prsefurca arcuated, sometimes with 

 a small stump of a vein, about one-third longer than distance from 

 origin of third longitudinal vein to small cross-vein ; great cross- 

 vein situated more or less before middle of discal cell ; sixth 

 longitudinal vein straight or nearly so ; seventh a little arcuated 

 at the tip. 



Hab. — Gosford, Woronora and Manly, near Sydney (Skuse) ; 

 Blue Mts. (Masters). January to March, Eighteen specimens. 



Genus 5. Trochobola, Osten-Sacken. 



Biscobola, O.-Sack., Proc. Ent. Soc. Philad. p. 226, 1865; 

 Trochobola, O.-Sack., Mon. Dipt. N. Amer. IV. p. 97, 1868; 

 Studies, 11. p. 178, 1887. 



" One sub-marginal cell ; four posterior cells ; a discal cell ; 

 the tip of the auxiliary vein is far beyond the origin of the second 

 longitudinal vein; the marginal cross-vein is some distance 

 anterior to the tip of the first longitudinal vein ; a supernumerary 

 cross-vein connects the sixth and seventh longitudinal veins. 

 Antennae 14-iointed. Feet slender; tibiae without spurs at the 

 tip ; empodia indistinct ; ungues with teeth on the under side." 

 (Osten-Sacken). 



