Haseman: Nf.w Fishf.s from riir. Rio Iguassu. 381 



compressed; the caudal peduncle of the same width throughout its 

 entire length and with several accessory caudal rays imbedded in 

 the fatty marginal band of skin; depth of caudal peduncle three-fourths 

 tliat of th • body and about half the length of the head; mouth rather 

 small, its width being one-third of the length of the head; eyes small, 

 ,1 in intcT()rI)ital, which is two-thirds the length of the snout; nares 

 separated by the distance of an orbital diameter, and the posterior nares 

 more than the distance of an orbital diameter in front of the eyes; teeth 

 in two rows in each jaw. Origin of the dorsal much nearer the tip of 

 caudal than tip of the snout; origin about half-way between that of 

 ventrals and anal; no fin-rays produced; origin of anal under the 

 posterior part of dorsal; caudal almost rounded or slightly truncate; 

 all three pairs of barbels of almost equal length, none extending beyond 

 the base of the pectoral. 



In life four w^ere yellow, mottled with a dark subpattern. One 

 very small example was almost white, having only a few faint brownish 

 spots; one resembled in color P. tcenia Steindachner, from the v/estern 

 slopes of Peru. The color-patterns vary. Some specimens have a 

 dark lateral band from the head to the base of the caudal, with one 

 or more series of spots or blotches above it; others are mottled, others 

 yellowish, and some are almost colorless. The fins are plain, rarely 

 with isolated minute dusky spots. Origin of ventrals about half- 

 way from tip of snout to tip of caudal; greatest depth of head not quite 

 half of its length. 



No. 286ia-i, 2.1 to 4.5 cm. All were taken from a small sandy 

 shady creek, rocky in places, and flowing at the base of Serrinha 

 into the Rio Iguassu near Serrinha Parana, Dec. 23, 1908, during 

 flood season. 



The color-pattern of the type is intermediate between the extremes. 



This species is much more slender than P. proops, and has a differ- 

 ently shaped head, and there are other minor differences. It is 

 apparently more closely allied to P. tcenia Steindachner of the western 

 slopes of Peru. 



I have named this fish in honor of Dr. Davis of Corumba, who in 

 various ways assisted me during the latter part of my journey. 



Genus Glanidium Liitken. 

 6. Glanidium ribeiroi, sp. nov. (Plate LXXVIII.) 



Type, Xo. 2877, 13.7 cm., Porto Uniao da Victoria, Parana, Brazil, 

 from the Rio Iguassu, where they are locally known as "bocudo." 



