1 8 BULLETIN OF THE LABORATORIES 



The antenna consists of five joints, [fi^, 20], the fourth 

 joint being- very long and slender. The distal joint is narrow, 

 being no wider than the base of the terminal claws. The term- 

 inal claws are slender and the distal portion of each is fringed 

 by a longitudinal row of very fine teeth. The natatory setae 

 extend to a short distance beyond the tip of the terminal claws. 



The second joint of the mandibular palp bears, in addition 

 to the usual setae, a short, plumose, dagger-shaped seta, [fig. 

 18.] The terminal claws of the palp are slender and smooth. 



The two prominent spines upon the first mandibular pro- 

 cess of the first maxilla bear teeth, [fig. 16.] 



The palp of the second maxilla terminates in three 

 long flexible spines. The middle spine is longer than the whole 

 palp, but the lateral ones are only about two-thirds as long as 

 the middle one. 



The first foot [fig. 21] is five jointed, the third and fourth 

 joints being distinct. The second joint is broad and is as long 

 as the united lengths of the next three joints. The terminal 

 claw is longer than the united lengths of the last three joints. 

 The distal third of the cephalic margin of this claw is finely 

 pectinated. 



The claw upon the last joint of the second foot [fig. 23] is 

 curved and is about twice as long as the terminal joint. 



The post-abdominal rami [fig. 19] are slender and straight. 

 The terminal claws are long and slender, being about half as 

 long as the ramus. They are straight and one margin of the 

 tip of each is finely pectinated. The lower claw is fully three- 

 fourths as long as the distal one and resembles it in structure. 



Habitat : These were found in great numbers in a shallow 

 grassy pool at Burlington, Ohio. They were found in the early 

 part of March, 1893, just after the close of a long and severe 

 winter ; indeed, there was a light snow-fall the day before the col- 

 lection was made. Judging by the lay of the land, I think that 

 the pool dries up in summer. 



At Atlanta, Ga., just after some heavy rains in January, 



