﻿76 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loo 



land near Porto Alegre (September) and numerous specimens were 

 found in pools in the River Tiete, near the city of Sao Paulo (Novem- 

 ber, March, July, February). 



STRANDESIA TIETENSIS. new species 



FiGUKB 14, d, e, g, h 



Specific characters. — Female: Height about half the length and 

 highest in posterior third. Dorsal margin arched, ventral margin 

 nearly flat. Both extremities broadly rounded. Ventral margin 

 with a narrow hyaline border without visible pore canals. Surface of 

 valves covered in posterior and ventral portions by a series of fine 

 reticulations. Natatory setae of second antennae reach to tips of 

 terminal claws. Spines of third masticatory process of maxilla 

 heavily toothed. First leg more slender than in S. denticulata and 

 with a longer though equally heavy claw. Spine on inner margin of 

 divided third segment unusually well developed. Second leg with a 

 heavy, curved, and denticulate beaklilvc terminal claw and a long 

 reflexed seta. Two recurved shorter setae extend from the base of 

 the claw. Furca long and slender and equaling nine-fifteenths the 

 length of the valves. Terminal seta eight-ninths the length of ter- 

 minal claw. Subterminal claw about two-thirds the length of ter- 

 minal claw. Both claws well armed. Dorsal seta short and haired. 

 Dorsal margin of ramus finely haired throughout its distal third. 

 Length 1.49 mm; height 0.72 mm. 



Male: Unknown. 



Holotype.—V. S.'N.M. No. 83031. 



Type locality. — One specimen was found in a collection made by 

 Dr. Kleerekoper from temporary backwater pools of the River Tiete 

 near the city of Sao Paulo (July) . 



STRANDESIA RIOGRANDENSIS, new species 



Figure 14, a, h, f 



Specific characters. — Female: Height slightly greater than half the 

 length and highest in posterior third. Dorsal margin highly arched. 

 Both extremities broadly rounded. The posterior extremity has a 

 forward-sloping posteroventral margin. Valves very thin and sparsely 

 haired. From above, left valve overlaps right valve in front. Ventral 

 margin convex. Natatory setae of second antennae reach to tips of 

 terminal claws. Spines on third masticatory process of maxilla are 

 toothed. First leg similar to that of S. tietensis. Second leg also 

 similar to that of tietensis. Furca four-sevenths the length of the 

 valves. Terminal seta slightly less than two-thirds the length of the 

 terminal claw. Claws very much heavier than in tietensis and heavily 

 armed with large, coarse teeth. Dorsal seta short and unh aired. 



