eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 453 



66. Anal 11-13; head 4.5; depth 5.5. 



d. Scales 42 or 43; D. 6 or 7; A. 11-12; caudal broadly rounded; origin of anal equidistant from base 

 of middle caudal rays and upper angle of gill-openings; base of the anal equal to the head 

 or head less snout; about thirty scales before the dorsal; female with a faint black spot on 

 upper part of caudal peduncle; sides of the females with a dark spot on the center of each 

 scale; sides of the males with a dark spot on the center of each scale and dark stripes between 

 the rows of scales, especially noticeable on the flank, the dark spots becoming obscure at 

 times with the increase in intensity of the stripes; ventrals pale; caudal cross-spotted; spots 



of the upper part of the sides olive-green, those of the lower rusty stagnatus. 



dd. Scales 42 plus several on the base of the caudal peduncle; nine scales between dorsal and anal; 

 D. 7; A. 13; caudal pointed lanceolate, with cross-bands between the rays; origin of the anal 

 equidistant from the base of the middle caudal rays and the second scale behind the upper 

 margin of the axil of the pectoral; base of anal equal to head less opercle; over thirty scales 



before the dorsal lanceolatus. 



ddd. About forty scales along the middle of the sides, eight between dorsal and anal, twenty-three before 

 dorsal; D. 7; A. 11. Origin of anal equidistant from base of middle caudal rays and pre- 

 opercle; base of anal equal to head less opercle; anal, ventrals, and lower margin of caudal 

 edged with black; a conspicuous black band forward from the eye and around the chin 

 light lines along the rows of scales frenatus. 



295. Rivulus breviceps Eigenmann. (Plate LXIII, fig. 1.) 



Rivulus breviceps Eigenmann, Ann. Carnegie Mus., XI, 1909, 49; Repts. Prince- 

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



Type, 50 mm. Shrimp Creek. (Carnegie Museum Catalog of Fishes No. 

 1075.) 



Cotypes, four specimens, 50, 35, 32, and 18 mm. respectively, at least the two 

 larger being males. Shrimp Creek, where the path from Tukeit to the head of 

 the Kaieteur crosses it. (C. M. Cat. No. 1515; I. U. Cat. No. 11758.) 



Distinguished by its short head, few scales, and absence of longitudinal mark- 

 ings. This species was taken with R. waimacui. 



296. Rivulus holmiae Eigenmann. (Plate LXIII, figs. 2, 3.) 



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



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



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

 1076.) 



Cotypes, four females, 38-77 mm., and thirteen males, 48-70 mm. Creeks 

 about Holmia. (C. M. Cat. No. 1077; I. U. Cat. No. 11759.) 



Rather abundant under the rocks of a small rivulet behind the Company's 

 House at Holmia. My attention was first called to it by two Indian girls, who, while 

 bathing, caught several specimens for me. 



