70 DIPTERA OF AUSTRALIA, 



somewhat hoary. Halteres with a brown stem. Abdomen more 

 or less tinged with brown or brownish, usually on the terminal 

 segments ; genitalia ochreous. Legs long and very slender. 

 Wings with pale greyish cloudings, the clear spaces appearing 

 whitish when viewed at a certain obliquity ; two very noticeal^>le 

 whitish spaces occur on the posterior margin, the first, usually 

 squarish, at tip of seventh longitudinal vein, the second triangular, 

 beneath tip of sixth longitudinal ; most of the cells at apex of 

 wing with a central clear space, it really being the veins which 

 are clouded. Anterior branch of second longitudinal obliquely 

 situated, the first longitudinal terminating in it close to the base ; 

 ultimate section of second longitudinal vein a little arcuate, bending 

 anteriorly towards the tip ; preefurca short, slightly arcuated at its 

 origin, in line with remaining portion of second longitudinal ; 

 discal cell longer than wide, pentagonal, in punctiform contact 

 with the fifth posterior. 



^a6.— Lawson, Blue Mnts., and Berowra, N.S.W. (Masters) ; 

 Middle Harbour, near Sydney (Skuse). Five specimens. 



Section II. CTENOPHORINA. 



First longitudinal vein usually terminating in the anterior branch 

 of the second longitudinal in such a manner that the ultimate sec- 

 tion of the branch appears as a continuation of the first longitu- 

 dinal. Normal number of antenna! joints thirteen in both sexes ; 

 in ^ the flagellar joints with a variable number of branches, or rarely 

 (in Prionota) only serrate ; in the ^ simple, serrate, or rarely with 

 short branches. Head closely applied to the thorax ; front broad ; 

 eyes round. Rostrum as short as, or shorter than in Pachyrrliina, 

 gibbose in front ; nasus present, obtuse, hairy. Legs sho7't and 

 stout; tarsi usually shorter than the tibice ; metatarsal joint shorter 

 than, equal in length to, or but little longer than the remaining 

 four joints taken together; ungues large. Genitalia of (J of a 

 complicated structure, sometimes (in Ctenophora) with a long 

 protruding adminiculum. 



