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ENTOMOSTRACA OF MINNESOTA. 317 
‘The terminal segment of the palp of the first maxilla is a little 
more than a fourth the length of the basal, the latter with one subter- 
minal bristle without, and several terminal ones. Tip of last segment 
with two stout, curved, claw-like set, and four or five smaller, softer 
ones. Outer lobe of maxilla proper reaching to tip of first segment. 
of palp, nearly equaling it in diameter, also with two curved claws, 
shorter but much stouter than those mentioned above, three-fourths 
as long as the lobe itself. Besides these, two smaller sete and three 
or more sub-terminal ones, two of which are smooth, like the terminal 
group, one strongly plumose. A single plumose seta also springs 
from near the base of the concave surface of this lobe. The second 
and third lobes similarly armed at the tip, but with a larger number 
of curved sete, all of which are soft. Two of these, on the short inner 
lobe, are much longer and stouter than the others, and project directly 
backwards. The base of this lobe bears two plumose sete about as 
long as those just mentioned. The length of the inner lobe is half 
that of the outer, the middle one being intermediate. 
‘“‘The second maxilla with about 12 terminal sets, which diminish 
in length inward, most of them slightly plumose, and two long slender 
setae, one springing from the middle of the inner margin and the other 
from the base. Palp thick, slender ovate, twice as long as the masti- 
eatory lobe, fringed with a soft silky pile. and bearing three more or 
less plumose setee at its tip, the middle one of which is the longest. 
Branchial lobe very small, semicircular, with three fully developed 
plumose sete nearly as long as the palp, and two much shorter ones, 
one delicate and smooth, the other stout and plumose. 
‘“The basal segment of the second antenna trigonal, with one mod- 
erately long hair beneath, and two of similar length springing together 
from the inner side of the apex. The second segment subcylindrical, 
with two hairs diverging from the middle of the outer side of the apex, 
the under one of which is very short and weak, about as long as the 
third segment is wide, while its companion reaches about to the tip of 
that segment. On the inside of the tip of the second segment is another 
hair, similar to the above, and of about the same length. The third 
segment bears, at the union of its basal with its middle third, on the 
under side, set beyond a slight tooth-like projection, a jointed olfactory 
club, whose length is about two-thirds the diameter of the segment. 
Otherwise this segment bears no hairs except at the tip, where, upon 
its inferior angle, is one long, stout hair, reaching beyond the tip of 
the last joint, and upon its inner surface a fascicle of five plumose 
hairs, the four longer of which are curved and parallel, while the fifth 
is short and straight. The third segment is slightly longer than the 
second and about two-thirds as thick. The fourth segment is three- 
