508 MEMOIRS OF THE CARNEGIE MUSEUM 



344. Heterogramma steindachneri Regan. (Plate LXVIII, fig. 2.) 

 Heterogramma steindachneri Regan, Ann. and Mag. Nat. Hist., (8), I, 1908, 371 



(Georgetown). — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 

 1910, 478. 



One specimen, 65 mm. Twoca Pan. (C. M. Cat. No. 2312.) 



Two specimens, 51 mm. Chipoo Creek. (C. M. Cat. No. 2313; I. U. Cat. 

 No. 12472.) 



Two specimens, 55-70 mm. Mud-flats, Demerara River. (C. M. Cat. 

 No. 2314; I. U. Cat. No. 12473.) 



Four specimens, 35-52 mm. Below Packeoo Falls. (C. M. Cat. No. 2315a-fe; 

 I. U. Cat. No. 12474.) 



Twenty-five specimens, 25-50 mm. Gluck Island. (C. M. Cat. No. 2316a-e; 

 I. U. Cat. No. 12475.) 



Fourteen specimens, 24-40 mm. Rockstone. (C. M. Cat. No. 23l7a-h; 

 I. U. Cat, No. 12476.) 



Two specimens, 45-65 mm. Christianburg. (C. M. Cat. No. 2318; I. U. 

 Cat. No. 12477.) 



Eleven specimens, 35-50 mm. Maduni Creek. (C. M. Cat, No. 2319; I. 

 U. Cat. No. 12478.) 



One specimen, 28 mm. Cane Grove Corner. (C. M. Cat. No. 2320.) 



Forty-one specimens, 22-57 mm. Lama Stop-Off. (C. M. Cat. No. 

 2321a-e; I. U. Cat, No. 12479.) 



One specimen, 28 mm. Kumaka. (C. M. Cat. No. 2457.) 



One specimen, 30 mm. Tumatumari. (C. M. Cat. No. 2322.) 



I am not absolutely certain about the identification of this species. It is widely 

 distributed, reaching from tidal influence to the headwaters of the Rupununi 

 and the Ireng River of the Amazon basin. It frequently differs from the typical 

 steindachneri of Regan and from all other species of the genus in having the middle 

 caudal rays truncate, and the outer rays prolonged. 



Head 2.8-3; depth 2.4-2.6; D. XV,7 or 8; A. 111,6; lateral line 13 or 14 + 5 

 or 6; scales 21-23 in a median line; eye 1 in the snout, 3.5 in the head, 1 in the 

 interorbital. 



Rather deep, the dorsal profile steeper than the ventral, the mouth terminal. 

 Maxillary reaching to below the anterior margin of the eye, maxillary-premaxillary 

 line about 3 in the length of the head; width of preorbital little more than one- 

 third of the diameter of the eye. 



One-half to one and one-half scales above the lateral line for most of its 



