334 MEMOIRS OF THE CARNEGIE MUSEUM 



Type, 32 mm. Erukin. (Carnegie Museum Catalog of Fishes No. 1448.) 



Cotypes, thirty-two specimens, 21-33 mm. Erukin. (C. M. Cat. No. 

 1449o-e; I. U. Cat, No. 11905.) 



Head 3.75; depth 3.33 to 3.75; D. 11; A. 20-22; scales 5-31 to 34-3-3.5; eye 

 2.5 in head; snout two-thirds of eye. Interorbital less than eye, about 2.75 in 

 head. 



No true humeral spot; pores and margins of the first three or four scales in 

 the lateral line heavily outlined with dusky: a group of large chromatophores just 

 behind the eye. Web of distal half of dorsal, almost all of the caudal, all of the 

 ventrals and pectorals, and the web between the first seven anal rays, dusky. 

 Often a faint dark spot at the base of each caudal lobe, but no true caudal spot. 

 Scales of the back and upper one-third of the sides outlined with dusky. A broad 

 stripe extending from the head to the caudal and half-way to the end of the middle 

 caudal rays without chromatophores, cherry-red in life. Below this lateral stripe 

 a dusky stripe, two scales in width, extends the length of the body. The belly and 

 a streak on the sides from just above the bases of the anterior ten anal rays to the 

 mandible are without chromatophores. Base of the anal and under side of the caudal 

 peduncle black to dusky. Lips dusky. Dorsal lobe and upper part of the iris 

 cherry-red in life. 



191. Hemigrammus rodwayi Durbin. (Plate XLVIII, fig. 3.) 



Hemigrammus rodwayi Durbin, Ann. Carnegie Mus., VI, 1909, 58. — Eigenmann, 



Repts. Princeton Univ. Exp. Patagonia, III, 1910, 436. 



Type, 46 mm. Georgetown trenches. (Carnegie Museum Catalog of Fishes 

 No. 1450.) 



Cotypes, one hundred and eighty-three specimens, 38-49 mm. Georgetown 

 trenches. (C. M. Cat. No. 1451a-z; I. IT. Cat. No. 11906.) 



Cotypes, one hundred and twelve specimens, 28-53 mm. Botanic Garden. 

 (C. M. Cat, No. 1452a-2; I. U. Cat. No. 11907.) 



Cotypes, four specimens, 24-26 mm. Mud creek in Aruka. (C. M. Cat. 

 No. 1453a-6; I. U. Cat, No. 11908.) 



Cotypes, seven specimens, 34-40 mm. Creek in Barima River. (C. M. Cat, 

 No. U54a-b; I. U. Cat, No. 11909.) 



Head 4; depth 2.75-3; D. 11 ; A. 22-24; scales 5-32 to 34-2.5 to 3.5; eye 2-2.33 

 in head; snout two-thirds of the eye, interorbital very nearly equal to eye, 2.4 to 

 2.5 in head. 



No shoulder spot. A silvery lateral stripe extends from the caudal to about 



