THE AMERICAN TETRAGONOPTERINAE. 245 



1st to 5th scales of the lateral line, and above those scales a conspicuous, silvery 

 spot on its upper anterior corner; a narrow, faint, silvery band; a conspicuous 

 black spot, about as large as the pupil on the base of the middle caudal rays; 

 tips of middle half of caudal rays dusky; anal nearly uniformly dark; pectorals 

 and ventrals profusely dotted, nearly black. 



12. AsTYANAX (PoEciLURicHTHYs) ABRAMOiDES Eigeumann. 

 Plate 54, fig. 2. 



Tetragovoplerus abrmnis Gunther {non Jenyns), Cat. fishes Brit, mus., 1864, 5, p. 321 (British Guiana, 

 Essequibo); Steindachner, Flus.sf. Siidamer., 1879, 1, p. 18 (Orinoco, near Ciudad, Bolivar). 



Astyanax abramoides Eigenmann, Ann. Carnegie mus., 1909, 6, p. 121; Kept. Princeton univ. exped. 

 Patagonia, 1910, 3, p. 432; Mem. Carnegie mus., 1912, 5, p. 3.57, pi. 52, fig. 4. 



Habitat. — Venezuela and Guiana. 



Specimens examined. 



Locality Collector 



Tumatumari, Potaro River Eigenmann 



Tumatumari, Potaro River Eigenmann 



Potaro Landing Eigenmann 



Kangaruma, Lower Potaro River Eigenmann 



Aniatuk Cataract, Potaro River Eigenmann 



Rockstone, Essequibo River Eigenmann 



Gluck Island, Rockstone Eigenmann 



Wismar, Demerara River Eigenmann 



Christianburg, Demerara River Eigenmann 



Closely allied to A. anterior and A. abramis differing in the color of the 

 caudal peduncle and caudal in both. 



Head 4; depth 2.4-2.5; D. 11; A. usually 28^; scales 9 or 10-43 to 51--7 

 or 8; eye 2.5-3; interorbital 2.5-2.6. 



Elliptical, dorsal, and ventral outlines similar, without prominent humps, 

 the profile slightly depressed over the eyes. Preventral area rounded, with 

 small rather irregularly placed scales; postventral area narrowly rounded. 

 Predorsal area, narrow, with a linear median naked area. 



Occipital process equal to one fourth of the distance from its base to the 

 dorsal, bordered by 4 scales on its sides; skull smooth in cross-section, very 



' In those examined, one with 26, ten with 28, five with 29, three with 30. 



= In those examined one with 43, four with 44, two with 45, four with 46, four with 47, one with 51. 



