4 PROCEEDINGS OF THE NATIONAL MUSEUM vol 70 



to about the middle of the second segment of the right exopodite. 

 The second basal segment is of about the same length as the corre- 

 sponding segment of the right foot and has the lateral hair near the 

 distal end. The first segment of the exopodite is twice as long as. 

 wide. The second segment is short, setose on the inner margin, and 

 armed with a digitiform process and a sharp spine. The endopodite 

 is slender, as long as the first segment of the exopodite, and setose 

 at tip. 



Length of female, 1.1 mm. Length of male, 0.9 mm. 



Locality. — Ponds in Polk County, Fla., in collections made by 

 Frank J. Myers. 



This species resembles D. saltillinus Brewer so closely that it is, 

 perhaps, a fair question whether it should be considered more than 

 a variety of that species. It has been considered best, however, to 

 recognize it as distinct. It differs from D. saltillinus in the follow- 

 ing particulars; 



In the male fifth feet there is no projection on the inner margin of 

 the second basal segment of the right foot. There is a small blunt 

 spine on the posterior surface of the second segment of the right 

 exopodite. 



In the female abdomen the second segment is covered or nearly 

 covered by the first, while in Z>. saltillinus this segment is distinct. 

 Schacht, 1897,^ describes D. albuquerquensis from Florida. It was 

 shown by Marsh, 1907,* that his description did not apply to D. 

 albuquerquensis Herrick and the suggestion was made that it was 

 more nearly like Z>. saltillinus. It seems probable, now, that his 

 D. alhiiquerqiiensis was D. floi'idanus. 



Paratype of male deposited in National Museum, slide. Cat. No. 



52397, U.S.N.M. 



Paratype of female deposited in National Museum, slide, Cat. No. 



52398, U.S.N.M. 



' Bull. 111. State Lab. Nat. Hist., vol. 5, art. 3, The North American Species of Diap- 

 tomus, pp. 146-149. 



* Trans. Wis. Acad. Sciences, Arts and Letteis, vol. 15, pt. 2, A Revision of the North 

 American Species of Diaptomus, pp. 473-474. 



