MESOCHRA. 63 
with rows of thickly set, short spines (Pl. XLI, fig. 21), 
last segment short and destitute of spines, caudal 
segments a little longer than broad. Anterior antenna 
of the female short, the joints of nearly equal size, the 
third and fourth being, however, slightly longer than 
the rest (Pl. XLI, fig. 15). In the male the anterior 
antenna ig short and thick (fig. 16), corrugated and 
obtuse, ending in a small aborted claw. Posterior 
antenna 2-jointed (fig. 17), and having a very small 
1-jointed branch attached to the middle of the inner 
margin of the first joint. Second pair of foot-jaws 
(fig. 19) small, terminal claw long and slender. First 
joint of inner branch of first pair of feet (Pl. XLVII, 
fig. 17) longer than the entire outer branch, with 
ciliated margins, and bearing below the middle of the 
inner margin a moderately long seta; last joint (coale- 
scent second and third joints, Boeck) short, and 
armed with two long and strong apical sete; the three 
joints of the outer branch with strong apical spines 
and fringed margins, middle joint fringed also on 
the inner margin, the three terminal sete of last 
joint geniculated. First joint of the inner branch in 
the three following pairs of feet not very much 
smaller than the second joint (Pl. XLVII, figs. 18— 
20). Inner segment of the basal joint of fifth pair 
long and broad (fig. 21), and having six stout setze of 
various lengths; second joint rather small, sub-quad- 
rangular, and bearing five sete, the longest of which 
are plumose. In the male the fifth foot 1s much smaller 
(Pl. XLI, fig. 20), and the inner segment of the hasal 
joint has only three sete. The anal operculum is 
