xo. 20G2. NEW ROTATORIA FROM PAXAMA—HARRiyG. 551 



COLURELLA UNCINATA (MUUer). 



In a creek flowing into Camacho Reservoir (3), common; stagnant 

 pool at Empire (4), few; Rio Grande Reservoir (5), few; Rio Grande 

 (6), few. 



SQUATINELLA MUTICA (Ehrenberg). 

 StepJmnops muticus Ehrenberg, Abh. Akad. Wiss., Berlin (for 1831), 1832, p. 138. 

 A single specimen from a creek flomng into Camacho Reservoir (3). 



TRICHOTRIA TETRACTIS (Ehrenberg). 

 Dinocharis tetractis Ehrenberg, Abh. Akad. Wiss., Berlin, 1830, p. 47. 



In a pool near the railroad, between Black Swamp and Gatun (2), 

 rare; Rio Trinidad, above Agua Clara (10), few. 



MACROCHAETUS COLLINSH (Gosse). 

 Dinocharis collimii Gosse, Int. Obs., vol. 10, 1867, p. 269, fig. 

 In a pool near the railroad, between Black Swamp and Gatun (2), 

 few; creek flowing into Camacho Reservoir (3), few; Rio Cocoli, 

 above lake, rare; stagnant pool at Empire (4), common; Rio Grande 

 (6), rare. 



SCARIDIUM EUDACTYLOTUM Gosse. 



A single specimen from a pond east of Canal at Empire (8). 



SCARIDIUM LONGICAUDUM (MUUer). 



In a creek flowing into Camacho Reservoir (3), few; stagnant pool 

 at Empire (4), few; Rio Trinidad, above Agua Clara (10), few. 



TRICHOCERCA BICRISTATA (Gosse). 



Rattulus hicristatus Jennings, Bull. U. S. Fish Comm., vol. 22, 1903, p. 330, 

 pi. 9, figs. 77-80. 

 From a pond east of canal at Empire (8), rare; Rio Trinidad, at 

 Escoval (11), few. 



TRICHOCERCA PUSILLA (Jennings). 



Rattulus puslllus Jennings, Bull. U. S. Fish Comm., vol. 22, 1903, p. 339, pi. 9, 

 figs. 81-85. 

 From a stagnant pool at Empire (4), few; Rio Grande Reservoir 

 (5), few; pond at Miraflores, back water of Rio Camitillo (12), few. 



TRICHOCERCA NITIDA, new species. 

 Plate 17, fig. 2. 



The body is moderately long, straight on the ventral side and 

 gibbous dorsaUy. The head sheath is set off from the body by a 

 faint constriction; it has a number of obscure longitudinal folds. 

 The anterior margin is sinuate and without any teeth or spines. 

 The striated area is a little less than one-third the length of the 



