78 DIPTEaA OF AUSTRALIA, 



Were it not for the existence of some Australian and South 

 American forms the remaining genera, as far as they are known, 

 might be considered to form a tolerably compact section. 



The insects here included may usually be distinguished from 

 DoLlCHOPEZiNAby the possession of 13- (or more) jointed antennae, 

 a discal cell, posterior cell in contact with the discal, moderately 

 long prtefurca, oblique position of the anterior branch of the 

 second longitudinal vein, and character of the male genital 

 organs ; while, on the other hand, they may be distinguished 

 from the Ctenophorina by their slender form, long slender 

 legs, &c. ; but until our knowledge of the Tipulidte-longipalpi 

 is more extended, a satisfactory division into sections seems 

 impossible, though likely enough increased acquaintance with 

 known genera and the discovery of new forms may render the 

 task still more impracticable. 



Synopsis of Genera. 



i. no distinct nasus to rostrum ; (j forceps of simple struc- 

 TURE. 



A. Antennse pectinate, with a variable number of joints. 

 1. Antennce 13-jointed in ^, lo-jointed in (^. 

 a. ^ antennse with long branches. 



* Second submarginal and discal cells in complete contact. 

 ^ antennse : first flagellar joint short, with a long 

 branch on the underside ; second to eighth with three 

 long branches, one on each side at the base and the 

 other beneath at the middle ; on the eighth joint 

 (which is much prolonged) the third branch short and 

 situated near the apex ; three cylindrical terminal 

 joints. 2 antennse : first flagellar joint short, with a 

 short bi-anch beneath ; second to eighth with a short 

 branch on each side at the base, those on the outside 

 rather longer, especially the middle ones ; five 

 cylindrical terminal joints. Ptilogyna, Westw. 



