DASYBATUS GUTTATUS. 391 



in the shape of the disk and in the keel above the tail and from D. hastaius, 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. 



Pastinaca hastata DeKay, 1842, N. Y. fish., pi. 65, f. 214. 



Trygon hastata Storer, 1846, Mem. Amer. acad., new ser., 2, p. 261; Dum^ril, 1865, Elasm., p. 592. 

 Dasibatis hastata Garman, 1882, Bull. 16, U. S. nat. mus., p. 70. 



Dasyatis 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. marinus 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. 



labebirete Marcgrave, 1648, Hist. nat. Brasil, p. 175. 



Raia tuberculata Lacepedb, 1800, Poissons, 2, pi. 4, f. 1; Shaw, 1804, Zool., 5, p. 290, pi. 127 (non 



BONNATERRE, 1788). 



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



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



Trygon tuberculata GtJNTH., 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. 

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



nac, 14, p. 188. 



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

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



