454 MEMOIRS OF THE CARNEGIE MUSEUM 



Belly in life yellow, spots in the smaller specimens rusty, sides bluish; dorsal 

 and anal red, margined with olive. Spots in the female dark brown, sides olive. 



It is interesting to note that the females have the distinguishing caudal spot, 

 and are otherwise more brilliantlj^ marked than the males. 



297. Rivulus waimacui Eigenmann. (Plate LXIII, figs. 4, 5.) 



" Waimacui." 



Rivulus waimacui Eigenmann, Ann. Carnegie Mus., VI, 1909, 50; Repts. Prince- 

 ton Univ. Exp. Patagonia, III, 1910, 455. 

 Type, a female, 79 mm. vShrimp Creek. Carnegie Museum Catalog of 



Fishes No. 1078.) 



Cotypes, five males, 57-88 mm.; seven females, 41-88 mm. Shrimp Creek. 



(C. M. Cat. No. 1079; I. U. Cat. No. 11760.) 



Cotype, one specimen, 25 mm. Amatuk. (C. M. Cat. No. 1080.) 



Cotype, one specimen, 41 mm. Waratuk. (C. M. Cat. No. 1081). 



Rather abundant in Shrimp Creek ("Orimetuk" of the Indians, near the 



Kaieteur). At the time of my visit the water was confined to cracks in the long 



rocky steps forming the bed of this creek. 



Female. — Upper surface olive. Sides cobalt-blue, shading to sky-blue below, 



alternating with stripes of bright red; dorsal and caudal margined with light 



greenish blue, somewhat rusty on lower edge; darker part of dorsal and caudal 



purple; anal very pale blue with rusty spots at base, then rusty, margined with 



dark purple, as are also the ventrals. Entire ventral surface salmon to orange; 



pectorals geranium-red to orange; ventrals, except at margin, like belly. Chin 



and lips purplish. 



Male. — Caudal purplish red; anal yellowish with purple spots; belly white; 



back and sides olive-purplish with stripes of dark purple. 



298. Rivulus stagnatus Eigenmann. (Plate LXIII, figs. 6, 7.) 



Rivulus stagnatus Eigenmann, Ann. Carnegie Mus., VI, 1909, 50; Repts. Princeton 



Univ. Exp. Patagonia, III, 1910, 455. 



Type, a female, 44 mm. Christianburg. (Carnegie Museum Catalog of 

 Fishes No. 1082.) 



Cotypes, thirteen males, the largest 41 mm.; six females, the largest 46 mm. 

 Christianburg. (C. M. Cat. No. 1083a-d; I. U. Cat. No. 11761.) 



Abundant in little pools just below the saw-mill at Christianburg. Several 

 specimens, probably belonging to this species, were sent me from Kumaka, on the 

 Demerara above Wismar. 



