258 DIPTERA OF AUSTRALIA, 



of first longitudinal ; fourth longitudinal very pale beyond cross- 

 vein, almost reaching wing-margin, its tip situated at a point J 

 the distance from tip of third longitudinal to that of anterior 

 branch of fifth longitudinal fork ; base of latter lying somewhat 

 beyond middle cross-vein, its posterior branch 1 the length of 

 anterior. 



Hah. — Berowra, Hawkesbury district, N.S.W. (Masters). 



250. Orthocladius insolidus, sp.n. (PI. xi., fig. 13). 



(J. — Length of antennae 0*025 inch ... 0-62 millimetre. 



Expanse of wing 055x0-017 ... 1-39 x 042 



Size of body 0-060x0-012 ... l-54x0-30 



Antennae light brown; plumes with yellowish reflections; basal 

 joint deep brown or black. Head, clypeus and palpi brown or 

 brownish-black. Thorax black, slightly ochreous at the humeri 

 and brown longitudinally in front of scutellum, opaque ; pleurae 

 brown, tinged with ochreous; pectus and metanotum black, 

 levigate ; scutellum ochreous. Halteres ochreous-yellow. Abdo- 

 men rather more than twice the length of thorax, umber brown, 

 levigate, tinged with ochreous-brown beneath ; clothed with 

 yellowish hairs ; anal joint and forceps short, deep brown. Legs 

 light greyish-brown, with a pale pubescence; the genua yellow. 

 In fore legs tibia about J longer than metatarsus. Wings longer 

 than abdomen, pellucid, with a delicate brown tint, and brassy 

 reflections ; costal, first and third longitudinal veins, and basal half 

 of fourth longitudinal vein, pale greyish-brown. Auxiliary vein 

 very indistinct, joining costa at a point almost mid-way between 

 middle cross-vein and tip of first longitudinal vein ; second longi- 

 tudinal vein entirely wanting ; third longitudinal joining costa 

 very far from apex of wing and before tip of anterior branch of 

 fifth longitudinal fork ; costal vein extending beyond tip of third 

 longitudinal i the distance from that to tip of fourth longitudinal ; 

 latter almost reaching wing-margin, its tip situated at a point 

 just before apex and at a point almost | the distance from tip of 

 third longitudinal to that of anterior branch of fifth longitudinal 

 fork ; base of latter lying somewhat beyond a point mid-way 



