217 



SUBFAMILY CHARACTERS 



Larva. — Head well developed, the dorsum chitinized and with 2 

 elongate posterior excisions; labium well developed, in some genera 

 (Pedicia and Dicranota) in the form of 2 plates; mandibles stout, 

 their inner lower margin toothed. Some of the abdominal segments 

 with conspicuous locomotor organs, either in the form of paired 

 pseudopods or elevated transverse areas. Apical segment with 2 long 

 terminal processes. Spiracles situated on dorsum at base of terminal 

 processes. 



Pupa. — Distinguishable from allied forms by the knobbed respira- 

 tory organs. The ventral segments of the species described by Miall 

 each have a pair of tubercles on the disc, but Beling's description of 

 the pupa of Pedicia rivosa makes no mention of such tubercles. 



Imago. — See key to subfamilies. 



HABITS OF LARVAE 



The larvae are aquatic, feeding upon algae and small Crustacea 

 of various kinds, or upon aquatic worms. 



HABITS OF IMAGINES 



The imagines are of a rather sluggish habit, and may be swept 

 from vegetation in the vicinity of streams. Their food-habits are 

 the same as those of Eriopterinae. 



Keys to Genera 



LARVAE 



1. Very large species, 35^5 mm. in length; paired pseudopods con- 



fined to segments 8-11 ; anal ventral blood-gills very long, about 

 equal in length to the apical processes Pedicia. 



— Smaller species, not exceeding 25 mm. in length 2 



2. Ventral surface of apical abdominal segment with 4 slender pro- 



trusive blood-gills ; spiracles conspicuous, situated on rather large 

 elevations Dicranota. 



— Ventral surface of apical abdominal segment without, or with very 



small, slender protrusive blood-gills; spiracles very small, situ- 

 ated upon small elevations RTiapTiidolabis. 



PUPAE 



1. Ventral abdominal segments without wart-like elevations; large 

 species, more than 30 mm. in length Pedicia. 



