TIPUUM. 87 



4. Tibiae with spurs at the tip; the first longitudinal vein usually ends 



in the second Cylindrotomini. 



Tibiae without spurs; the first vein ends in the costa. Antochini. 



5. Tibiae without spurs at the tip. .... Eriopterini. 

 Tibiae with spurs at the tip 6 



6. The subcostal cross-vein is beyond the origin of the second longi- 



tudinal vein. ......... 7 



The subcostal cross-vein is before the origin of the second longi- 

 tudinal vein. Amalopini. 



7. Antennae composed of sixteen joints. . . Limnophilini. 

 Antennae composed of from six to ten joints, often much elongated. 



Anisomerini. 



LIMNOBIINI. 



1. Proboscis longer than the head and thorax together (29). 



Geranomyia. 

 Proboscis shorter than the head and thorax together. . . 2 



2. Antennae pectinate or subpectinate, at least, in the male (25, p. 80. 3) 



Rhipidia. 

 Antennae not pectinate. ........ 3 



3. A supernumerary cross-vein between the sixth and seventh veins. 



Discobola. 

 No cross-vein connecting the sixth and seventh veins. . . 4 



4. Tip of the auxiliary vein usually opposite, or before, or only a short 



distance beyond the origin of the second vein; marginal cross- 

 vein always at the tip of the first longitudinal vein; legs slender. 



Dicranomyia. 



Tip of the auxiliary vein usually far beyond the origin of the second 



vein; marginal cross-vein sometimes at the tip but often some 



distance before the tip of the first vein; legs comparatively stout. 



Limnobia. 

 ANTOCHINI. 



1. Rostrum at least as long as the head, sometimes very long; no mar- 



ginal cross-vein. ......... 2 



Rostrum shorter than the head 4 



2. Wings without submarginal cell (18). . .' . Toxorhina. 

 Wings with submarginal cell. ....... 3 



3. Rostrum not much longer than the head (31). Rhamphidia. 

 Rostrum the length of the body. . . . Elephantomyia. 



