﻿NORTH AMERICAN NOTOSTRACA — LINDER 



45 



about as numerous as in female. Telson, except supra-anal plate, as 

 in female. Supra-anal plate 6.5 mm. in length, 35 percent of length 

 of carapace; in paratypes 0.7-5 mm,, 18-32 percent of length of cara- 

 pace. This plate irregularly bUobed, with 2 rather large spines dor- 

 sally in midline; in paratypes form varying as in female, with 2-6 

 spines. Caudal filaments 23 mm.; in paratypes 14-25.5 mm. Body- 

 rings exposed behind carapace 15+i; in paratypes 10-19. Color as 

 in female. 



Total length Avithout supra-anal plate and without caudal filaments 

 29.5 mm.; paratypes 12-24 mm. 



Carapace length 18.5 mm., width 2x11 mm., width: length relation 

 1.19; in paratypes length 11.5-16.5, width 2x7-2x10 mm., width: 

 length relation 1.08-1.33. Anterior part broader than in females. 

 Spines on lateral margin of carapace as in females. Carina missing; 

 one short spine in midline; in paratypes sometimes trace of an incon- 

 spicuous carina at the places where there are spines, these ranging 



Figure 21. — First leg of a female paratype of Lepidurus lynchi, new species (Uppsala Mus.), 



X 6. 



