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 setaj, 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 sette 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 setie, 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 setae 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 seta3, which diminish 

 in length inward, most of them slightly plumose, and two long slender 

 setJB, 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- 

 catory lobe, fringed with a soft silky pile, and bearing three more or 

 less plumose set^e at its tip, the middle one of which is the longest. 

 Branchial lobe very small, semicircular, with three fully developed 

 plumose setse 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- 



