eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 195 



fontanel; profile abruptly descending in front of the eye, the snout sharp; a pair 

 of patches of small teeth in each jaw; those of the upper jaw sometimes wanting; 

 mouth narrow, 1-1.5 in the distance between the gill-openings. Maxillary barbel 

 reaching to the gill-openings. 



Lateral plates nearly equally well-developed along the entire length; humeral 

 process truncate, its upper and lower margins nearly parallel, its depth one-third 

 of its length. 



Distance between snout and dorsal 2.5 in the length, dorsal spine as long as 

 snout and eye or shorter; pectoral spine longer than dorsal spine, reaching the 

 ventrals; adipose fin low, its base equal to the base of the dorsal without the spine. 

 Axillary pores numerous. 



White below, ashy above, no definite markings. In the specimen from Bartica 

 the dorsal spine is margined with dark. 



64. Hemidoras micropceus sp. nov. 



Hemidoras micropceus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 



1910, 394 (name only). 



Type, 365 mm. Wismar. (Carnegie Museum Catalog of Fishes No. 1636.) 



Cotype, 217 mm. Wismar. 



Cotypes, two specimens, 250-270 mm. Lama Stop-Off. (C. M. Cat. No. 

 1637; I. U. Cat. No. 12029.) 



These specimens differ from carinatus in having the plates from above the 

 ventrals forward rudimentary. 



65. Hemidoras leporhinus sp. nov. (Plate XIX, fig. 1.) 



Hemidoras leporhinus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 



1910, 394 (name only). 



Type, 56 mm. Tumatumari. (Carnegie Museum Catalog of Fishes No. 

 1624.) 



Cotypes, three specimens, 53-59 mm. Crab Falls. (C. M. Cat. No. 1625; I. 

 U. Cat. No. 12021.) 



Readily distinguished by its peculiar leporine snout, and by its mouth, lower 

 teeth, and coloration. 



Head nearly 4; depth 5; D. 6; A. 12; lateral plates 33 to 35; eye 2.4 in the head, 

 equal to the snout; interorbital 1.6 in the eye. 



Depth equal to the width in front of the pectoral; caudal peduncle slender, its 

 depth equal to the distance of the anal from the caudal fulcra; profile curved, 



