222 DIPTERA OF AUSTRALIA, 



d. Antennae with twelve joints or more in the (J, seven 



or eight in the 9. 1. Chironomus. 

 dd. Antennae 15-jointed, plumose in the $, with the 

 penultimate joint elongated. Pobrachial areolet 

 closed externally. 2. Tanypus. 

 cc. Wings nearly spatulate, the anal margin being sloped 

 without an angle. 3. Corynoneura. 

 hh. Metathorax short, descending. Posterior coxae extending 

 downwards beyond the convex mesosternum. 4. Cerat- 

 opogon. 

 aa. Proboscis and palpi obsolete. Wings coriaceous. 5. Clunio. 



It would facilitate the study of the Chironomidae if the genera 

 were divided into properly defined sections or sub-families, and it 

 appears to me that at least three very natural sections may be 

 thus defined : — 



Section I. Chironomina. 



Third and fourth lon^^itudinal veins never furcate. Marginal 



cross- vein wanting. No posterior cross- vein. Antennae of Q with 



few joints. 



Section II. Tanypina. 



Third and fourth longitudinal veins never furcate. Marginal 

 cross-vein present. Posterior cross-vein present. 



Section III. Ceratopogonina. 



Third longitudinal vein entirely wanting or rudimentary (a fork 

 only being often indistinctly visible). Fourth longitudinal vein 

 furcate. Marginal cross-vein usually present, often wanting. 

 Posterior cross-vein wanting. 



Note. — Some of the genera imperfectly or totally unknown to 

 me may require new sections, but this must be determined by 

 others. A separate section ought probably to receive the genera 

 Halirytus and Psamathiomya, aberrant Chironomidce in which 

 the palpi are 2-jointed, the antennae 6-jointed, without plumes, 

 and the wings small, rudimentary, and without veins. 



