436 Illinois State Laboratory of Natural Histoi^y. 



Length 1.40-1.65 mm., height .66-.90 mm., and width 

 .70-. 80 mm. 



The shell is thin, covered with long hairs, and yellow- 

 ish brown except some bluish black stripes on the dor- 

 sum and sides. The dorsal band begins just back of the 

 eje-spot, from which place two bands extend directly 

 downward, spreading laterally and covering quite an ex- 

 tended area near the center of the shell. After extend- 

 ing posteriorly a short distance, the dorsal band sends 

 downward two more bands which curve forward near the 

 ventral edge of the shell, and finally mei-ge with the 

 central patch. 



Seen from the side, the shell is suboval, somewhat 

 narrower posteriorly, highest just anterior to the middle. 

 Ventral margin quite straight. 



Seen from above, the shell is subelliptical, somewhat 

 more pointed anteriorly than posteriorly, while the sides 

 are nearly parallel at the middle for a short distance. 



Seen from the end, the sides are very convex. 



Second antennae stout; terminal claws toothed near 

 tip, and of approximately the same length; natatory 

 setae extending beyond the tips of the terminal claws 

 from one third to one half the length of the claws. 



The two-segmented spines on the first process of the 

 first maxilla are toothed. 



First foot five- segmented, third segment shghtly shorter 

 than the fourth, which is three times as long as the 

 terminal segment. 



Second foot slender; terminal claw twice as long as the 

 terminal segment and slightly bent. 



Caudal rami long, straight, and narrow, more than 

 twenty times as long as wide, the dorsal edge finely 

 ppctinate to within a short distance of base (Fig. 7). 

 Terminal claw slender, straight, finely pectinate, half as 

 long as the ramus; subterminal claw five sevenths as 

 long as terminal one. Terminal seta a fourth longer than 

 the dorsal one, which is a third as long as the subterm- 



