14 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
the 'brush' (PI. 4, fig. 29, bf.). In other members of the group its 
appearance is more characteristic. The middle and anterior tro- 
chanters show no features worthy of mention. 
■ Femora. — The posterior femur is spindle-shaped, that is, the profile 
outlines of both the dorsal and ventral faces as seen from the front are 
slightly convex. The anterior face typically bears five rows of bristles, 
an upper (PI. 4, fig. 29, bafu.3) and two lower approximated rows 
{bafl.3) that are quite prominent extending the full length of the 
femur (i. e., complete), and two intermediate rows (bafi.3) that are not 
developed distally. The latter consist of short, sometimes vestigial 
bristles, that are directed outward along the face of the femur. In 
small specimens the lower of these two rows may be lacking. The 
lower, posterior face of this segment bears a few well separated bristles 
on its proximal third. On the upper distal portion is a short, slightly 
diagonal row of about three bristles. The middle femur has an an- 
terior (PI. 2, fig. 12, bvfa.2) and a posterior (bvfp.2) row of bristles on its 
ventral face. Both are complete. The distal third of the posterior 
row, however, consists of a series of close set, very short, stubby spines. 
This is termed the 'comb' (PI. 2, fig. 12, cb.). A similar, but less 
apparent condition is present in the anterior row, but the above 
designation applies to the former only. In the middle of the anterior 
face is a short row of from three to five bristles. Others occur on the 
upper distal portion of the posterior face as on the hind femur. The 
anterior femur is somewhat shorter than the others; its anterior face 
is slightly fiattened, the posterior strongly convex, more hairy than the 
other parts of the legs and bears three rows of very close set, rather 
long bristles. 
Tibiae. — All the tibiae are more or less cylindrical, somewhat 
enlarged distally, and bear scattered bristles. Only the middle one, 
however, has a bristle on the ventral surface. This is placed on or near 
the middle line, about two thirds of the distance from the proximal 
end of the tibia. It is directed downward and outward, and is called 
the submesotibial bristle (PI. 2, fig. 12, bsm.). For the most part, the 
bristles tend to be arranged in rows parallel to a median dorsal ridge. 
Those of the anterior tibiae are smallest and fewest in number. 
Tarsi. — Each tarsus consists of five segments, and, except the first 
or most proximal, these are flattened dorsoventrally. The former is 
more cylindrical. The outer four all widen distally, and are abruptly 
stalked at the base. This stalk fits into a cup4ike socket in the 
