18 CHARACTERS OF THE FAMILIES 



Median cell of the anterior wings and the discoi- 

 dal cell of the posterior wings nearly always open 

 or absent. Radius and first apical sector normal. 

 Second apical fork in the anterior wings absent, 

 though occasionally indications of it may be seen. 

 Ocelli absent. 



Molannida. Maxillary palpi densely hairy, the ter- 

 minal joint not sub- articulated. The median cell 

 and discoidal cell always absent. The nervures 

 ending in the apical margin reduced in numbers. 

 Ocelli absent. 



Hydropsy chides. Maxillary palpi but slightly hairy, 

 the last joint whip-shaped and multi-articulate. 

 First apical fork always present in the fore- wings. 

 Ocelli absent ; the anterior tibiae never furnished 

 with more than two spurs. 



Polycentropidce. Maxillary palpi but slightly hairy, 

 the last joint whip-shaped and multi-articulate. 

 Ocelli absent. Anterior tibiae furnished with three 

 spurs. 



Psychomyides. Maxillary palpi but slightly hairy, the 



last joint whip-shaped and multi-articulate. First 



apical fork absent in the anterior wings. Ocelli 



absent. Anterior tibiae never furnished with more 



. than two spurs. 



Philopotamidce. Maxillary palpi but slightly hairy ; the 

 last joint whip-shaped and multi-articulate. 

 Ocelli present. Anterior tibiae very seldom 

 furnished with more than two spurs. 



Rhyacophilidcs. Maxillary palpi but slightly hairy ; last 

 joint similar in structure to the others, and not sub- 

 articulate. Ocelli present. The anterior tibiae 

 with three or two spurs. Pupa enveloped in 

 a cocoon. 



Hydroptilidce. These insects are so minute as to be of 

 no practical value to the fisherman, but to com- 

 plete these descriptions I give the following points : 

 Fore tibiae with never more than one spur. Ocelli 

 absent or present according to genera. Anterior 

 wings clothed with strong, dense, " brushed-up " 

 hairs. Neuration greatly simplified. 



