Jordan and Evennann. — Fishes of North America. 85 



rounded outer extremities ; hiuder and inner margins convex. Upper jaw 

 witli a deep indentation, receiving a corresponding prominence on the 

 lower. Teetli at the sides of tliis indentation much larger; month with 

 5 papillsB. Tail less than twice as long as the disk, tapering to a fine 

 point, rough with small prickles, similar to those scattei'ed over the 

 head and back, a cutaneous expansion above, and a broader, longer one 

 below ; these end nearly opposite each other, the lower extends for- 

 ward under the spine. A median row of tubercles on the dorsum and 1 

 or a pair on each shoulder. Distinguished from D. gymnura by the 

 shape of the snout, the rounded pectorals, the shorter tail, the larger 

 ,teeth, the greater curvature of jaws, the smaller size, and the 2 cuta- 

 neous expansions. Proportional length of body and tail as 4| to 8; in 

 no case is the tail twice as long as the disk. Color ochraceous brown. 

 Streams and estuaries of Florida, abundant on both coasts; several speci- 

 mens were taken in Lake Monroe, at a distance from salt water. (Gar- 

 man.) 



TriigoH sahitin, Le Sueur, .lour. Ac. Nat. Sci. Phila., iv, 109, 1824, Florida. 

 Diisibniis sa)iinn, .ToRDAN & ftii.rtERT, Synopsis, 08,1883. 



12.5. D.iST.VTIS LONG.V, Garman. 



Disk quadrangular, about ^ wider than long. Margins nearly straight, 

 anterior meeting in a blunt angle on the end of the snout. Outer 

 angles rounded, posterior l)lunt. Ventrals rounded. Tail variable in 

 length, usually more than twice as long as the body, roughened with 

 small asperities, depressed anteriorly, compressed behind the spine, keeled 

 above the compressed portion, with a long, narrow, cutaneous expansion 

 on the lower side. Mouth curved, with 5 papilla? ; a row of small tu- 

 bercles behind the head on the shoulder girdle. Larger specimens prob- 

 ably with tubercles on back and tail. Gulf of California to Panama. 

 Perhaps not distinct from D. dipteriira, from which it usually differs in the 

 slightly longer tail, and perhaps in the presence of 5 papillte instead of 

 3 in the mouth. {Jongus, long.) 



Dasihalis longri, Garman, Bull. Mus. Corap. Zoiil., vi, 170, 1880, Acapulco ; Panama ; .Jor- 

 dan & Gilbert, Synopsis, 66, 188.3. 



1-26. DASTATIS DIPTKRURA, Jordan A Gilbert. 



Disk rhomboid, slightly broader than long, its anterior margins nearly 

 straight, meeting anteriorly in a very obtuse angle; posterior margins 

 curved ; lateral angles rounded ; tail variaV)le, usually i longer than the 

 disk, with a conspicuous cutaneous fold below and a smaller but evi- 

 dent one above; jaws considerably arched; buccal papilhi! 3; teeth f^. 

 Young perfectly smooth; adult with a roAV of low but rather stout tuber- 

 cles on the median line of the scapular region and 2 others on the hu- 

 meral region ; tail with small prickles ; caudal spine long, its length 

 nearly 3 times the width of the mouth. Color bluish brown, nearly plain. 

 L. 6 feet or more. Bay of San Diego, and southward ; locally abundant. 

 ((5tf, two; TTTtipov, wing; uhpa, tail.) 



Dasyhiilis dipteninm, .ToRDAN & Gn.iiERT, Proc. V. S. Nat. Mus., 1880, 31, San Diego. 

 Dasihalis diplerura, Jordan & Gilbert, Syuopais, 71,1883. 



