v 28'2 Illinois Stale Laboratory of Natural History. 



outer apical angle with a long delicate plumose seta. Third 

 segment slightly narrower than the second; margins sulcate, 

 armed with six subequal plumose seta? similar to the seta on 

 the preceding segment, of which three are apical, two are on 

 tin' outer margin, and one is on the inner. The seta' are so 

 placed as to form two groups of three each. 



Basal segments of left fifth leu like those of right leg. First 

 segment of outer ramus similar to the corresponding segment 

 of the outer ramus of the right leg and similarly armed, hut 

 not quite so broad. Second segment subquadrate, about one 

 and a half times as long as wide; outer apical angle armed 

 as in the preceding segment; inner margin provided with a 

 few delicate hairs. Third segment considerably narrower 

 than the second and slightly shorter; armed at the apex with 

 two lamellate seta j and a short sharp spine. Inner ramus 

 like that of right leg. 



Fifth pair of legs of female biramose. Second basal seg- 

 ment provided on the- outer margin, a short distance above 

 the middle, with a delicate hair slanting upward. First seg- 

 ment of outer ramus subquadrate, slightly broader than long ; 

 armed at the outer distal angle with a long lamellate spine; 

 and on each side of this with a very minute smooth spine. 

 Second segment somewhat shorter and narrower than the 

 preceding ; armed at the outer distal angle like the first seg- 

 ment, except that the inner of the small spines is wanting ; 

 inner apical angle produced into a long, moderately stout 

 lamellate hook, shaped about like the blade of a pruning 

 knife ; both margins provided with a few fine hairs. Third 

 segment slightly longer than the second, about twice as long 

 as wide; armed at the outer apical angle with a plumosely 

 lamellate spine almost as long as the segment itself, and at the 

 apex with two similar subequal spines (about twice the length 

 of the lamellate spine) and a short smooth spine; outer mar- 

 gin provided with a few long tine hairs ; inner margin sulcate 

 and armed with four slender subequal plumose seta- about as 

 long as the segment. 



Inner ramus of fifth leg of female three-segmented, the 

 first segment irregular in' shape, with a somewhat projecting 



