TO BULLETIN OF THE LABORATORIES 



The first foot [fig. 27] of male is composed of four joints. The 

 most proximal joint is large. The antipenultimate joint is about as 

 long as the preceding joint. From its disto-caudal margin arises a 

 medium sized seta; and from its disto-cephalic margin arises a some- 

 what smaller seta. The terminal joint is about the same size as the 

 penultimate. From its disto-caudal margin arises a medium sized 

 seta and a small spine ; from its disto-cephalic margin arises a very 

 short spine. From the distal end of joint arises a long claw ; the 

 claw is about as long as the combined lengths of the three distal joints. 

 The claw is composed of a short basal and a long termmal portion. 

 At the disto-caudal portion of the basal joint of claw there is a short 

 seta; at the disto-cephalic margin of the same joint there is some- 

 what smaller seta. A row of fine hairs extends along the middle por- 

 tions of the caudal margin of the terminal joint of the claw. 



The second foot of the male [fig. 25] is composed of three joints. 

 The antipenultimate joint is medium sized. From about tne mid- 

 dle of this joint arises a median seta; and from the disto-caudal 

 margin a long seta. The penultimate joint is the longest joint ; from 

 its disto-cephalic margin arises a median spine. Tlie terminal joint 

 is about as long as the antipenult ; from the middle of iis cephalic 

 border arises a short seta ; from its tip arises a short seta ; from its tip 

 a more or less curved short claw and a median seta. 



The post-abdomen [fig 29] of male is curved. At its tip there is a 

 long claw and a short seta. Entad of this terminal claw is another 

 long claw ; further entad arises a short seta. Post-abdomen of female 

 is straighter, otherwise the same. 



In the male there is a pair of verticillate sacs [fig. 30]. From the 

 distal extremity of each arises a vas deferens. Length of sac, 0.35 

 mm.; width, o.ii mm. The copulative organ of male consists of 

 distinct halves, each half of which is composed of a large basal and 

 a small terminal portion. The basal portion of each division receives 

 at its proximal end a vas deferens. Length of copuluive organ, 0.37 

 mm. Width, o. 11 mm. 



Length of female, 1.23 mm. Height, 0.63 mm Width, 0.60 

 mm. Length of male, 1.14 mm. Height, 060 mm. Width, 0.45 

 mm. Habit: Abundant in canal basin containing water plants or 

 grass. Clifton, Camp Washington. 



