02 Bulletin 4J, Utiited States National Museum. 



cc. Skill above plain olivaceous, or with obscure large whitish blotches. 

 d. Uidges of rostral cartilage Sf])aratc throughout. 



c. Disk above marked with faint, round slate-colored spots as large as eye; 



snout 2^ in length of disk, not very sharp at tip. glaucostioma, 82. 



ee. Disk without traces of pale spots above; snout rather longer, acute at 



tip. LEUCORHYNCHUS, 83. 



M. Ridges of rostral cartilage cunfluout about J^ the length; snout rounded at 

 tip. PROnucTUs, 84. 



ddd. Ridges of rostral cartilage united more than 34 their length; snout pro- 

 duced, narrow. 

 /, Groove between rostral cartilages moderate; upper surface with some large, 

 faint whitish spots; shoulders with 2 patches of spines. 



PKRCELLENS, 85. 



ff. Groove between rostral cartilages very short and small. spinosus, 86. 



bb. Spiracle with a single fold; snout blunt, rounded. planiceps, 87. 



SI. RHIKOBATUS LENTIGINOSUS, Garman. 

 Snout long and narrow, its ridges close together throughout. Ej-es 

 large, twice as large as spiracles. luterorbital space narrow, concave, as 

 wide as nostrils or the interspace between them. Distance between outer 

 angles of nostrils more than i the snout. Mouth straight, its width 

 not quite the interorbital space. Dorsal and preocular spines very small; 

 five larger spines on tip of snout; supraocular and scapular spines obso- 

 lete. L. 2 feet. Grayish, densely freckled with small paler spots, uni- 

 form below. Widths in length; tail about 2; snout to the mouth 5^. 

 Charleston southward, not rare on the Florida coast. {Icntigiiwsii^, 

 freckled.) 



RkiiMbalits letdigiiwsus, Garman, Bull. Mus. Comp. Zotil., 1880, lOX, Coast of Florida. 

 Bhinobatus lentUjinosus, Jordan & Gilbert, Synopsis, Go, 1883. 



82. RHINOBATUS GLAUCOSTIGMA, Jordan &. Gilbert. 



(GUITARRO.) 



Disk long and narrow, the snout produced but not acute at tip, its 

 length 2i in disk; interorbital width 3i in snout; spiracle large, with 

 2 folds; rostral ridges moderately separated, slowly convergent ante- 

 riorly, but not united; snout in female without fimbriate appendage; 

 vent somewhat nearer snout than base of caudal ; dorsal fins similar ; skin 

 everywhere rough with fine shagreen; no spines on snout; superciliary 

 spines very small; 1 or 2 spines on shoulder; a series of low, bluntish 

 spines along the middle of back, becoming larger and farther apart 

 behind. Color light gray, with the usual translucent area on sides of 

 snout. Disk with numerous round, clear slate-colored spots as large as 

 eye, symmetrically arranged; a blackish blotch below snout. L. 2^ feet. 

 Gulf of California, locally abundant; close to the next, but well distin- 

 guished by its color, which does not fade in spirits. {jAavKog, hoary blue; 

 ariyfia, spot.) 



lihinobntm (jlaucosligma, Jordan <& Gilbert, Proc. U. 8. Nat. Mus., 1883, 210, Mazatlan. (Type, 

 Nos. 28205; 28206; 29547; 29602.) 



83. RHINOBATUS LEUCORHYNCHUS, Gunther. 

 Disk rather long, the snout acute at tip; rostral ridges separate for 

 their whole length, converging toward tip of snout; eye moderate; 



