80 DIPTERA OP AUSTRALIA, 



Div. 2. Antennae unipectinate ; first flagellar joint 

 without a branch ; second to seventh with a single 

 short bi'anch ; four long cylindrical terminal joints. 



Ozodicera, Macq. 

 B. Antennae simple, sometimes serrate. 



1. Antennce short in both sexes, with a variable number of 

 joints ; and a certain number of linear terminal joints. 



Rostrum short and stout. 



a. Genitalia not protruding in either sex. 



Antennae 7-jointed (*? in both sexes) ; first joint of 

 scapus nearly half the length of entire antennae. 

 Palpi with terminal joint short. Semnotes, Westw. 



Antennae 10-jointed ; first joint of scapus not one- 

 third the length of entire antennae. Palpi with the ter- 

 minal joint long, flagelliform. Leptotarsus, Guerin. 



b. Genitalia protruding in both sexes ; ^ forceps of rather 

 simple structure. 



Antennae 12-jointed in ^, 14-joined in 2 ; linear ter- 

 minal joints beset with bristly hairs. Acracantha, Sk. 



2. Antennce usually short, sometimes very long, normally 



13-jointed in both sexes, so^netiines more. 



a. Genitalia protruding in both sexes. 

 * Antennae serrate. 



Nasus short (1). Abdomen short, pubescent. 

 Palpi with the terminal joint long, flagelliform. 

 Venation as in Tipula. Stygeropis, Loew. 



Nasus long. Abdomen long, cylindrical, glabrous. 

 Palpi with terminal joint long, flagelliform. $ 

 forceps of rather simple structure. Last section of 

 second longitudinal vein arcuate. Ischnotoma, Sk. 



** Antennce simple, often filiform. 



Rosti'um shorter than head. Palpi with ter- 

 minal joint short. ^ forceps with large foliaceous 

 appendages. Longurio, Loew. 



