LEPTOCERID&. 
The metathorax has a small chitinous plate bearing a few sete 
on each “shoulder.” 
The fore leg is broad and flat. The middle leg bears a tarsal 
claw that is as long as the basal tarsal joint. The distal segment 
MYSTACIDES SEPULCHRALIS. 
168. Larva. Head and thorax. 170. Case. 
169. Larva. Frons. 
of the trochanter is more than twice as long as the basal segment. 
The femur is divided into a long apical and very short basal piece. 
The hind leg bears a tarsal claw about half as long as the basal 
joint. The tibia has a swelling at about the middle of the segment 
that gives the segment the appearance of being divided, though 
carefully-prepared mounts have revealed no suture. The femur 
is divided into a short basal and long apical piece. The basal piece 
of the trochanter is short and the apical piece very long. 
The Abdomen.-—The first abdominal segment has a prominent 
bulb-shaped dorsal spacing-hump; the lateral humps are smaller ; 
on the caudal side of each lateral hump there is a brown chitinous 
plate with a black dorsal margin. Abdominal gills are absent. The 
lateral fringe consists of weak, pale hairs. The drag-hooks are 
stout ; chitinous supports at their bases are almost entirely wanting. 
DEsScRIPTION oF CasE.—The case of the larva, figure 170, con- 
sists of a slightly-tapering tube of sand grains, or minute bark 
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