120 Wisconsin Academy of Sciences, Arts, and Letters. 
labial nerve with the infra-oesophageal ganglion. Fig. 12h. 
The upper lip is single, the lower lip paired. 
Legs :—Thei three pairs of legs, PI. X, fig. 5, are so similar 
that a, description of a single one will answer for all of them. 
The only difference noticeable in the three pairs, are: first, 
the terminal claws are largest in the first and smallest in the 
third pair; second, the first hears two large setae at the distal 
end of the femur, the second and third have but one each; third, 
a slight increase in length from the first to the third pair. 
Each leg is firmly articulated to the internal skeletal frame¬ 
work and has inserted on its base two pairs of muscles. The 
narrow base of the femur is encircled by an irregular chitinous 
ring from which arises two muscles, an upper single 1 , and 
a lower double one, which pass forward to be inserted at the 
base of the tibia,; insertion tendinous. The long, slightly 
curved tibia is not more than half the thickness of the femur 
and contains no muscles except the proximal half of one which 
goes to the claw. The tarsus is two-segmented and contains 
three muscles; two arise dorsally on the proximal end of the 
first segment passing to the base of the claw, one above, and 
one below, while the third has its origin along the dorsal wall 
of the tibia a litte anterior to the center and is inserted above 
on the claw’s base. This last muscle has a tendinous insertion 
which passes near its end through a pulley similar to the one in 
the second antenna. The femur, tibia and first segment of the 
tarsus each bears at its distal end a seta. The terminal claw 
is strongly curved, nearly at a, right angle', and bears four teeth 
the comparative length of which varies somewhat in different 
individuals and on different legs. 
The legs are supported by an internal chitinous framework, 
PI. XT, fig. 8, consisting of two longitudinal strands and six 
vertical pieces arranged in three pairs. Each vertical strand 
is at its upper end articulated to one of the horizontal pieces, 
from which it passes downward to join the base of the nearest 
leg. The longitudinal pieces are laterally compressed, each di¬ 
viding just posterior to the insertion of an upright into' an up¬ 
per and a lower part. The openings thus formed vary in size, 
the anterior being largest, the posterior smallest. 
