302 DIPTERA OP AUSTRALIA, 



longitudinal present, pale but distinct, its posterior branch termi- 

 nating at tip of anterior branch of fourth longitudinal fork; latter 

 pale, indistinct at the base, anterior branch straight, joining 

 immediately above apex of wing ; posterior branch arcuating 

 posteriorly, joining wing-margin about mid-way between tips of 

 two anterior branches ; distinct wing-fold close and anterior 

 to fifth longitudinal and its anterior branch ; posterior branch, 

 of fifth longitudinal fork straight, anterior arcuated, not twice 

 the length of posterior. 



Hob. — Glenbrook, Blue Mountains, N.S.W. (Masters). 



Ohs. — Apparently an uncommon, but easily recognised species. 



283. Ceratopogon Sydneyensis, sp.n. (PI. xiii., fig. 40). 



(J. — Length of antennse 0-030 inch ... 0*76 millimetre. 



Expanse of wings 0*055 x 0-016 ... 1-39 x 0*40 



Size of body 0-055x0020 ... 1-39x0-50 



9. — Length of antennae 0-017 inch ... 0-42 millimetre. 



Expanse of wings 0-045x0-018 ... M3x0-45 



Size of body 0-055x0-020 .. 1-39x0-50 



(J and 9. — Antennae, head, and palpi in $ black, in 9 brown. 

 Thorax brown, darker in ^ than $, dull, with minute pale yellow 

 pubescence ; pleurae and metanotum dark brown ; scutellum 

 testaceous or ochreous-brown. Halteres white, stem brownish. 

 Abdomen short, robust in 9, brown, dull, clothed with yellowish 

 hairs. Legs light brown, with brownish hairs. In fore legs 

 tibia J longer than metatarsus. Wings about length of body, 

 hyaline, densely covered with brownish-yellow pubescence, richly 

 iridescent in 9, weaker in ^ ; veins yellowish-brown. Auxiliary 

 vein not distinguishable ; first longitudinal vein reaching costa 

 before base of fifth longitudinal fork ; second longitudinal reaching 

 costa somewhat beyond middle of anterior border, in ^ just 

 beyond base of fifth longitudinal fork, in 9 opposite tip of 



