﻿44 



PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



Figure 19. — Eyes and nuchal organ: a, Female holotype of Lepidurus packardi Simon 

 (Paris Mus.), X 12; b, male paratype of Lepidurus couesii Packard from Montana (Stock- 

 holm Mus.), X12; c, female paratype of Lepidurus lynchi, new species (Uppsala Mus.), 

 X8; d, male of Apus longicaudatus from Wyoming (U.S.N.M. No. 58766), X 8. 



Figure 20. — Ventral view of a portion of the right side of a female of Lepidurus lynchi, 

 new species, from which the last 25 legs have been removed, X 21. The specimen has 

 11+17.5+3.5=32 body-rings and 64 pairs of legs, a, Bases of legs; h, base of last (sixty- 

 fourth) leg; c, endopodite of thirty-ninth leg; d, twenty-ninth body-ring. 



epipodite in the form of an elevation with a few setae. Last leg very- 

 small . 



Males (55 specimens): Allotype ll + 14.5+4.5+i=30+i body- 

 rings ; paratypes 11 + (14.5-17)+ (3. 5-5. 5)=30-33+i body-rings. Sur- 

 face of body-rings smooth, spines on caudal border of legless rings 



