DASYBATUS GUTTATUS. 391 



in the shape of the disk and in the keel above the tail and from I), hastatus, a 

 nearer ally, in the great length of the tail. 



Secured by Mr. Alexander Agassiz at Acapulco, Mex. 



Length of disk 11.5, length of tail 28, and greatest width 13.8 inches. A 

 smaller individual from Panama, taken by the Hassler Expedition, has a length 

 in body of 9.3, a length in tail of 24.5 and a width in disk of 11.2 inches. It is a 

 light reddish brown. 



Dasybatus hastatus. 



Pastinaea hastata DbKay. 1842, N. Y. fish., pi. 05, f. 214. 



Trygon hastata Stoker, 1846, Mem. Amor, acad., new ser., 2, p. 261; Domeril, 1865, Elasm., p. 592. 

 Dasibali* Imslntu Carman, 1882, Bull. 16, U. S. nat. mus., p. 70. 



Dasyalis hastata Jord. & Everm., 1896, Bull. 47, U. S. nat. mus., p. 83; Ribeiro, 1907, Arch. Mus. nac, 

 14, p. 188; Coles, 1910, Bull. Amer. mus. nat. hist., 28, p. 338. 



Disk subquadrangular, about one fourth wider than long, anterior margins 

 nearly straight, meeting in a blunt angle at the end of the snout, outer and hinder 

 angles rounded. Mouth with three papillae at the bottom; jaws more curved 

 than those of D. marinas and less than those of D. sabinus. Tail about one and 

 one half times the length of the disk, with a low keel on the top behind the spine 

 and long deep membranous fold below, from the base of the spine backward; 

 roughened with small spines. Back smooth in young; old with scattered small 

 spines and with a vertebral row of narrow depressed backward-directed tubercles 

 on the middle of the back and on the base of the tail, paralleled on each shoulder 

 by a short row the length of which varies with age. 



Bluish or olivaceous brown. 



Atlantic Coasts of United States from Rhode Island to Brazil. 



Dasybatus guttatus. 

 Plate 71, fig. 1-2. 



Iabebirete Marcqrave, 1648, Hist. nat. Brasil, p. 175. 



Raia tuberculoid Lacepede, 1800, Poissons, 2, pi. 4, f. 1; Shaw, 1804, Zool., 6, p. 290, pi. 127 (non 



Bonnaterre, 1788). 

 Raia guttata Schneider, 1801, Bloch Ichth., p. 361. 

 Trygon gymnura Muller, 1835, Erman's reise, p. 25, pi. 13. 

 Trygon tuberculata G&nth., 1870, Cat. fishes Brit, mus., 8, p. 480, part. 

 Dasibatus tuberculata Garman, 1882, Bull. 16, U. S. nat. mus., p. 66; 1888, Bull. M. C. Z., 17, p. 99, 



pi. 41, 42. 

 Dasyalis gymnura Jord. & Everm., 1896, Bull. 47, U. S. nat. mus., p. 84; Ribeiro, 1907, Arch. Mus. 



nac, 14, p. 188. 



Disk subquadrangular, little broader than long, anterior margins straight, 

 meeting in a blunt angle beyond which the snout is produced as a rather broad- 



