72 DIPTERA OF AUSTRALIA, 



III. AntenncB with a certain number of branched joints in both 

 sexes, 



5 antennae witli the second to eighth flagellar joints with a 

 pair of short branches (^ unknown). Ctenogyna, Macq. 



(J antennas with first nine, 9 with first eight, flagellar joints 

 with a pair of short branches, shorter in 9 than in ^ ; the 

 terminal joints filiform, densely beset with almost erect hairs. 



CJytocosmus, Sk. 



Genus 3. Ctenogyna, Macquart. 



Ctenogyna, Macq., Dipt. Exot. I. p. 42, 1838; O.-Sacken, 

 Studies I. p. 177, 1886. 



First longitudinal vein terminating in anterior branch of 

 second longitudinal in such a way that the latter appears as a 

 continuation of the first. Rostrum very short, porrect, with an 

 obtuse, hairy nasus. Antennae 13-jointed; in 9 the first flagellar 

 joint with a short tooth-like branch beneath, the next seven joints 

 provided with two short, somewhat fusiform, branches laterally 

 at the base ; the three terminal joints small, simple, ovate. 



Head closely applied to the thorax ; front tolerably broad, 

 convex, clothed with short hairs. Rostrum about half the length 

 of the head, pubescent, with a distinct, obtuse, hairy nasus. 

 Eyes almost ovate, prominent. Palpi short ; first and third 

 joints shortest, cylindrical, about equal in length ; second joint 

 robust, thicker at apex, about one-third longer than the first or 

 third ; fourth slender, scarcely as long as the next preceding two 

 taken together. Antennae 13-jointed, beset with very short hairs; 

 first joint of the scapus long, obconical, second joint cyathiform; 

 the first flagellar joint with a short tooth-like branch beneath, 

 the next seven joints cylindrical or subcylindrical, provided with 

 two latei'al, somewhat fusiform, branches at the base, about one- 

 third longer than the joints ; terminal three joints small, simple, 

 ovate. CoUare inconspicuous, compressed. Thorax convex, 

 elongate-ovate ; transverse suture distinct ; scutellum small ; 

 metanotum convex. Abdomen more than twice the length and 



