112 DIPTERA OF AUSTRALIA, 



hind legs the tibiae longest and the tarsi less than twice their 

 length. Wings with a delicate brownish tint, slightly darker in 

 the costal cell ; stigma pale ; veins brown. Anterior branch of 

 second longitudinal vein considerably shorter than petiole of first 

 submarginal cell ; second posterior cell with a rather short petiole ; 

 discal cell more elongate in ^ than ^, pentangular, its anterior 

 border in direct line with petiole of second posterior cell ; fifth 

 posterior cell in punctiform contact with the discal. 



Hab. — Sydney (Masters and Skuse). Three specimens. 



415. ACRACANTHA MONTICOLA, Sp.n. 



(J. — Length of antennae O'lOO inch ... 2-54 millimetres. 



Expanse of wings 0-600 x 0-150 ... 15-24x3-81 



Size of body 0-600x0-070 ... 15-24x1-77 



Greatly resembling the preceding, A. Si/dneyensis, as regards 

 colouring ; the differences are as follows : — First joint of scapus 

 distinctly incrassated towards apex ; second joint black ; first 

 flagellar joint obconical, the next four (viewed from the side) 

 truncate-clavate, flattened above, of equal length, but progres- 

 sively diminishing in depth ; the remaining five terminal joints 

 linear, beset with long bristly hair. CoUai-e almost safi'ron- 

 yellow. Thorax ochreous-brown, darker on the pronotum, some- 

 what shining ; pleurae ochreous, consequently the yellow stripe 

 less prominent than in A. Sydneyensis. Halteres bi-own. Abdo- 

 men ochreous-brown, more or less infuscated towards the terminal 

 segment ; forceps ochreous. Coxae ochreous. Femora black, 

 growing ochreous towards the base. Genua pale. Tibiae and 

 tarsi black. Tarsi in fore and intermediate legs twice the length 

 of the tibiae, in the hind legs less than twice their length Wings 

 with a pale brownish tint, darker in the costal cell ; stigma 

 indistinct ; veins dark brown. Anterior branch of second longi- 

 tudinal vein shorter than the petiole of first sub-marginal cell ; 

 second posterior cell with a very short petiole ; discal cell rather 

 elongate, pentangular, its anterior border a little arcuated, in 

 punctiform contact with fifth posterior cell. 



