50 Annals of the Carnegie Museum. 



Rivulus holmiae sp. nov. 



Type, a female, 77 mm. (No. 1076 Carnegie Museum Catalog of 

 Fishes.) Holmia. 



Cotypes, 4 females, 38-77 mm.; and 13 males, 48-70 mm. (C. 

 M. Cat. No. 1077 j I. U. Cat. No. 11759.) 



Creeks about Holmia. 



Rather abundant under the rocks of a small rivulet behind the Com- 

 pany's House at Holmia. My attention was first called to it by two 

 Indian girls who caught several specimens for me while bathing. 



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 brilliantly marked than the males. 



Rivulus waimacui sp. nov. 

 ( Waimacui of the Indians. ) 



Type, a female, 79 mm. (No. 1078 Carnegie Museum Catalog of 

 Fishes.) Shrimp Creek. 



Cotypes, 5 males, 57-88 mm. ; 7 females, 41-88 mm. Shrimp Creek. 

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



Cotype, 1 specimen, 25 mm. Amatuk. (C. M. Cat. No. 1080.) 



Cotype, 1 specimen, 41 mm. Waratuk. (C. M. Cat. No. 1081). 



Rather abundant in Shrimp Creek (Orimeiuk 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 as well as ventrals with dark purple. 

 Entire ventral surface salmon to orange ; pectorals geranium -red to 

 orange ; ventrals except at margin like belly. Chin and lips purplish. 



Male. — Has caudal purplish-red, and anal yellowish with purple 



spots, belly white ; back and sides olive-purplish with stripes of dark 



purple. 



Rivulus stagnatus sp. nov. 



Type, a female, 44 mm. (No. 1082 Carnegie Museum Catalog of 

 Fishes. ) Christianburg. 



