498 proceedings of the academy of u^'^^y, 



Notes on the Species Received.^ 



1. Potamotrygon hystrix Miillerand Henle. Raya, Yabeliri. 



Eight specimens (No. 43). Laguna and Rio Paraguay, at Asvnicion. 



2. Bunocephalus rugosus sp. nov. 



Type, No. 9,819, one specimen (No. 221). 40 mm. Laguna near 

 Arroyo Chagalalina. ' 



D. 5; A. 7; V. 6. 



Body slender, greatest width in front of pectoral 2^ in length. Head 

 and body moderately deep ; the greatest depth 7A in the length. The 

 depth at the base of the dorsal spine H in the distance from the tip 

 of the snout to the base of the pectoral spine. 



The ridges and knobs of the head well developed. The skin over the 

 snout and sides of the head very warty; the nuchal crest long and 

 thin, extending f the distance to the base of the dorsal. Just beyond 

 its distal end is a small knob. On each side of the anterior end of the 

 nuchal crest is a lateral crest. These lateral crests run § the length 

 of the nuchal crest, converging slightly. Further, on each side there 

 are two prominent crests which pass obliciuely downward and forward 

 to the short, high, humeral crest. 



The interorbital space very concave. The crests bounding it are 

 the most prominent of any on the head. They arise just back of the 

 anterior nares, and after enclosing an elliptical space end at the base 

 of the nuchal crest. On each of these there are four prominent 

 knobs, two just back of the eye, and two just in front of the nuchal 

 crest. The eyes are placed laterally in these ridges. 



The interorbital width equals the snout plus the eye. 



The maxillary barbels reach to the middle of the pectorals. Mental 

 barbels short, reaching ^ the distance to the post mentals. Post 

 mentals reaching to the anterior end of the gill cleft. 



Coracoid processes parallel behind, their length If in the distance 

 between them, the processes extending half-way to a perpendicular 

 dropped from the base of the dorsal spine. The coracoid processes 

 and ridges very similar to those of B. bicolor. 



Humeral process extending about ^ the length of the pectoral spine. 



Pectoral pore small, touikI. 



Skin everywhere covered with very conspicuous warts; those on 

 the sides of the body and tail arranged in about 7 rows on each side. 



2 The numbers in parentheses are the ones used by Prof. Anisits to indicate 

 the various lots he collected. The numbers of the types are those they bear 

 in the register of the Indiana University. The common names are those col- 

 lected bv Prof. Anisits. 



