LEPTOCERIDE. 
suture is very long, extending diagonally up and back three-fourths 
the distance to the caudal margin of the segment. 
The front leg is short and stout. The tibia is broadened on 
its inner distal angle and bears a single spur. Projecting forward, 
above the base of the leg, there is a flat chitinous projection which 
differs but slightly from that of Setodes, figure 178. 
TRIAENODES SP. 
171. Larva. Head and thorax. 174. Larva. Middle leg. 
172. Larva. Frons. 175. Case. 
173. Egg mass. 
The middle leg is longer and less stout. The femur is divided 
into a long apical and very short basal piece. The trochanter has 
the apical piece more than twice as long as the basal piece. 
The hind leg is long and slender, and is provided with numer- 
ous long swimming hairs. The distal piece of the trochanter is 
much longer than the basal piece, appearing as a distinct joint. 
The Abdomen.—On the first segment the spacing humps are 
large and bulb-like; the lateral humps have no chitinous plates, 
but have a thick fringe of microscopic forward-pointing hairs. 
The lateral fringe is present, but is very weak. Large gills arising 
singly occur on segments 2 to 8, inclusive. Except for the drag- 
. hooks the prolegs are not chitinized. 
IOI 
