722 DIPTERA OF AUSTRALIA, 



joints of the scapus very sparsely haired ; flagellar joints sub- 

 sessile, 2^ to 4 times as long as Vjroad, the terminal joint con- 

 siderably longer. Head Vjlack. Eyes contiguous above. Palpi 

 yellow. Thorax black, levigate, with three longitudinal double 

 rows of minute yellowish pubescence, the intermediate row 

 indistinct, reaching a little beyond the middle of the 

 thorax, the lateral ones very distinct, extending almost to the 

 scutellum, not coalescent ; some short yellowish pubescence and 

 long setae between the origin of the wings and the humeri, 

 also on the scutellum. Halteres pale yellow, with very little 

 visible pubescence. Abdomen nearly as wide as the thorax, 

 uniformly black, moderately clothed with a short yellowisli 

 pubescence ; forceps shoit and robust, as wide as the terminal 

 abdominal segment. Coxae and femora ochraceous ; tibiae and 

 tarsi brownish-ochraceous, the tips of the tarsi dusky. In the 

 fore-legs the tarsi nearly ^ longer than the tibiae ; in the inter- 

 mediate-legs the tarsi .somewhat longer than the tibiae ; in the 

 hind-legs the tibiae about /„ longer than the tarsi. Spurs as long 

 as the last tarsal joint. Fiist joint of the tarsi in the fore- and 

 intermediate-legs about twice the length of the second, in the 

 hind-legs 2| times the length ; second joint about ^ longer than 

 the third and somewhat longer than the fourth and fifth together; 

 third joint J longer than the fourth ; fourth joint ^ longer than 

 the fifth. Wings pellucid, with a very pale smoky appearance^ 

 the costal and two first longitudinal veins deep brown ; bright 

 margaritaceous reflections. First longitudinal vein reaching the 

 costa a short distance Vjefore the base of the fork ; cross-vein dis- 

 tinct, situated a little beyond the middle of the first longitudinal ; 

 petiole very pale, shorter than the anterior Vjranch of the fork ; 

 branches running almost parallel to one another for the greater 

 part of their length, divergent at the tips ; the posterior branch 

 very little arcuated at the base, jg nearly twice the length of 

 gli, ; kl somewhat shorter than Im. 



Hah. — In the neighV>ourhood of Narrabeen Lagoon (8kuse). 

 October. 



