836 DIPTERA OF AUSTRALIA, 



Limnophila-\ike, consisting of two sub-cylindrical basal pieces, 

 with a horny claw-like appendage at apex, underneath which is a 

 soft, somewhat pointed appendage (PL xxiv., fig. 62). Legs some- 

 what stout ; the fore femora abruptly attenuated for their basal 

 third. Wings shorter than the abdomen, tolerably broad, and a 

 little dilated about the middle of the anterior margin. The veins 

 above the third longitudinal have their tips slightly arcuated 

 anteriorly, those below it have them arcuated posteriorly. Between 

 the costa and auxiliary veins, beyond the origin of the pra^furca, 

 there is usually a variable quantity of venous reticulation, appar- 

 ently originating in the costa, and sometimes actually forming 

 distinct cross- veins. In all the specimens before me the auxiliary 

 vein reaches the costa beyond the marginal cross-vein, the dis- 

 tance being somewhat variable ; however, according to Van der 

 Wulp's figure, the auxiliary vein in his specimen joins the costa 

 some distance before the marginal cross- vein. 



The first longitudinal vein ends in the costa near the posterior 

 end of the stigma, and opposite a point a little beyond the distal 

 end of the discal cell ; according to Van der Wulp's figure it 

 should join considerably before this, and opposite the origin of the 

 third longitudinal vein. The marginal cross-vein is very oblique 

 and has its posterior end generally opposite the tip of the auxiliary 

 vein or thereabouts. The pr^efurca is a little shorter than the 

 first sub-marginal cell, rather straight, but a little arcuated near 

 its origin. The first sub-marginal cell commences a little before 

 the second. The most remarkable character in the venation is 

 that the small cross-vein is situated at the distal end of the discal 

 cell, a position it is unknown to occupy in the wing of any other 

 member of the family ; on account of the position of the cross-vein 

 the first posterior cell is unusually short ; its inner end is more or 

 less beyond the distal end of the discal cell. The discal cell is almost 

 triangular, a little angular at the joining of the great cross-vein. 

 The great cross-vein is situated a short distance beyond the inner 



