INTRODUCTION. 23 



I. A single submarginal cell. 



Antennae 14-jointed. Antenna) 16-jointed, 



Sect. I. Linauobina. Sect. II. Limnobiua anomala. 



II. Two submarginal cells. 



No spurs at the tip of the tibia3. Tibiae with spurs. 



Sect. III. Eriopterina. 



Auxiliary cross-vein posterior Auxiliary cross-vein anterior 



to the origin of the second vein. to the origin of the second vein. 



Antennas 16-jointed. Antennae 6 or 10-jointed. Sect. VI. Amalopiua. 

 Sect. IV. Limiiophilina. Sect. V. Anisomerina. 



Besides the leading characters, mentioned in the table, almost 

 all the sections have some other characters peculiar to them, as 

 may be seen in the following definitions : — 



I. Limnobina. One submarginal cell ; four posterior cells. Normal num- 

 ber of antennal joints 1 fourteen (sometimes apparently 15). Eyes glabrous. 

 Tibiae without spurs at the tip ; ungues with more or less distinct teeth 

 on the under side ; empodia indistinct or none. 



II. Limnobina anomala (artificial group) . One submarginal cell (none 

 in Toxorrhina). Normal number of antennal joints sixteen. 



III. Eriopterina. Two submarginal cells ; four posterior ceHs (five cells 

 in Cladura only) ; discal cell sometimes closed, but very often open. 

 Normal number of antennal joints sixteen. Eyes glabrous. Tibiae without 

 spurs at the tip ; empodia distinct ; ungues smooth on the under side. 



IV. Limnophilina. Two submarginal cells ; usually five, seldom four 

 posterior cells ; discal cell generally present ; subcostal cross-vein posterior 

 to the origin of the second longitudinal vein, usually closely approximated 

 to the tip of the auxiliary vein (considerably distant in Trichocera only). 

 Eyes glabrous (pubescent in Trichocera). Normal number of antennal 

 joints sixteen. Tibiae with spurs at the tip; empodia distinct; ungues 

 smooth. 



V. Anisomerina. Two submarginal cells (only one in Cladolipes); 

 three, four, or five posterior cells ; discal cell closed or open ; subcostal 



1 Each one of the sections has a number of antennal joints, which is the 

 normal number of this section. If a genus or species belonging to it have 

 a smaller number, it can usually be shown that this number is due to the 

 coalescence of some joints. This is for instance the case with Elephantomyia 

 and Toxorrhina (compare these genera). Occasionally a larger number 

 of joints is met with, as in the genus Nephrotoma, among the Tipidiclce 

 Jongipalpi; or among some foreign genera of Limnophilina ; but these are 

 exceptions. 



