258 Illinois State Lahordtory of Katiiral Ihstortj. 



lar hyaline plate wliicli near its middle is somewhat produced 

 and provided with a number of delicate serrations. Second 

 segment consists of a bronder basal portion and a narrow 

 terminal part, the latter constituting about three fourths the 

 entire length, and extending upward to the middle of the 

 inner margin of the preceding segment ; apex produced at 

 the inner margin, forming a kind of hook. 



Left fifth leg uniramose, three-segmented. First segment 

 armed near the outer apical angle with a delicate seta and 

 produced on the inner margin into a large plate-like hook 

 almost as broad as the segment and strongly curved inward. 

 Second segment irregular in shape, slightly longer than broad, 

 and unarmed.* Third segment or terminal hook contorted, 

 about twice as long as the second segment ; basal portion 

 broad, with a projecting inner angle; inner margin sinuous, 

 the lower curve densely provided with fine long hairs ; outer 

 margin armed with three short, sharp unequal spines increas- 

 ing in size from aljove downwards ; the attenuate apex pro- 

 vided with a spine considerably larger than the others. 



Fifth leg of female uniramose, three-segmented. First 

 segment subquadrate, with flaring sides ; armed near the 

 outer apical angle with a rather delicate smooth seta. Sec- 

 ond segment subquadrate, al)Out one and a half times as long 

 as the first and about two and a half times as long as broad ; 

 armed at the outer distal angle with a short sharp spine 

 (occasionally with two subequal spines). Third segment 

 (terminal spines excluded) aljout as long and wide as the 

 second ; outer margin armed with a short sharp spine at 

 about the beginning of the distal half (another spine occa- 

 sionally present a short distance above this) ; apex provided 

 with three spines, the two outer ones subequal and the mid- 

 dle one considerably larger ; inner margin armed with two 

 spines near the apex of the segment, the upper about half 

 the size of the lower, and the margins of both denticulate. 



Length of female 2-2.5 mm.; that of male 1.7-2.1 mm. 



The al)ove description is based on type specimens of E. 



*(Jii (ine or two .specimens I noticed quite a large tubercle, with a roughened ii|i, 

 projecting from the anterior a.spect of this segment near the outer proximal angle, 

 but' did not lind it at all constant. 



