ENTOMOSTKACA OF MINNESOTA. 337 



length and the width is less than the height. In the male the height 

 is about one-third of the length. The color is yellow, with two green 

 blotches, one on each side, in front of the middle. These patches of 

 pigment are on the animal but show conspicuously through the trans- 

 lucent valves. The female carries her young in the enlarged caudal 

 portion of the valves. These are white and show distinctly through 

 the valves. 



Viewed from the side the shell is oblong, depressed in front, broad- 

 est caudad of the middle. The two extremities are rounded, the 

 cephalic end is narrow, while the caudal one is broad. 



Viewed from above the shell is ovate acuminate, widest near the 

 caudal extremity. The cephalic extremity is pointed while the 

 caudal is broad and notched where the two unequal valves meet. 



The antennules are stout and appear to be composed of only five 

 joints. In this respect as well as in the arrangement of the sette this 

 member differs from the corresponding member of i>. stevensoni. 



The antenna; are stout and are composed of five joints. The long 

 terminal claws are as long as the combined lengths of the last three 

 joints. The antepenultimate joint bears a conspicuous onejointed 

 appendage which terminates in one long and one short filament. 

 Here we have another marked difference between this species and D. 

 stevensoni. 



The mandible bears a three-jointed palp, to the terminal joint of 

 which is appended a lamina bearing several long curved filaments. 



The second maxilla bears a leg-like palp. The first foot is stout 

 and five-jointed. The second foot is not bordered by a fringe of hairs. 

 For arrangement of the setse consult the figures. 



The second foot consists of five joints; the terminal claw is longer 

 than that of the first foot. Like the first foot, none of its members are 

 bordered with short hairs. For the arrangement of sette consult 

 the figures. 



The abdomen terminates in a pointed process. 



Habitat: The only specimens yet found were collected in a sand 

 bottom reservoir at Atlanta, Georgia, Sept. 1, 1894. This reservoir is 

 about three miles in circumference and is fed by creeks which arise a 

 short distance off at the watershed of the state. 



