PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 519 



Snout loug, about four and oue-lialf times the width of the head between 

 the eyes, liostral cartilages narrow, ridges close together more than 

 half their length, expanded near the extremity. Eye moderate, larger 

 than the spiracle. Spiracle with two tubercles on the hinder margin. 

 Anterior nasal valve not dilated, extending over little more than half of 

 the length of the nostril. Mouth straight or slightly arched forward. 

 Covered with shagreen above and below. A row of small spines in a 

 vertebral series to the caudal, a row of several near the middle of each 

 half of the shoulder-girdle, and several above each eye and spiracle. 

 Ko spines on the snout. Tail depressed, with a fold on each side. Second 

 dorsal distant from the caudal more than the length of its base, and 

 from the first by the length of its anterior border. 



Claspers long, slender, but little swollen at the end. 



Olivaceous brown, transversely clouded with darker. A few small 

 round spots of white above the gills and behind the shoulder-girdle. 

 Translucent spaces of snout white ; below there is a lozenge-shaped spot 

 of dark, from each side of which a dark line passes to the anterior rays 

 of the i^ectorals. Old specimens more uniform in color j dark marks of 

 snout sometimes faded. 



Kio Janeiro and southward. 



Rhinobatus lentiginosus. 



Garman, 1660, Bull. Mus. Comp. Zool. 163. 



Outlines of body and fins similar to those of Jiorlcelii and undulatm. 

 Eostral cartilage long and narrow, a small groove near the head ; ridges 

 close together from base to extremity. Eyes large. Spiracles half as 

 large as the eyes, with two folds. Head narrow, concave between the 

 eyes. The width of the interocular space equals that of the nostrils or 

 their distance ai^art. Half the length of the snout is less than the dis- 

 tance between the outer angles of the nostrils. Mouth nearly straight, 

 a little less than twice the width of the head between the eyes. Scales 

 small, smooth. Spines of the dorsal series and the three in front of 

 each eye very small; those above the eye and spiracle not noticeable. 

 Tiie largest spines on the body are a group of five on the top of the end 

 of the snout, a pair of which resemble small horns. Shoulders smooth 

 or with a single small spine. 



Color a light grayish brown, densely freckled with small spots of 

 lighter ; uniform brownish below. On the lower side of the snout there 

 are faint indications of markings similar to those of undulatus. 



Distinguished from horJcelii and undulatus by the colors, the horn- 

 like spines on the end of the snout, the absence of spines on the shoul- 

 ders, the narrowness of the head as compared with the width of the 

 mouth, the shorter distance from snout to mouth, and the greater dis- 

 tance from mouth to vent. Total length 22.9, snout to mouth 4.1, snout 

 to vent 9.0, and width of pectorals 7.4 inches. 



Florida; South Carolina. 



