PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 519 
Snout long, about four and one-half times the width of the head between 
the eyes. Rostral 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. 
No spines on the snout. Tail depressed, witha 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 pectorals. Old specimens more uniform in color; dark marks of 
snout sometimes faded. 
Rio Janeiro and southward. 
Rhinobatus lentiginosus. 
Garman, 1880, Bull. Mus. Comp. Zool. 168. 
Outlines of body and fins similar to those of horkelii and undulatus. 
Rostral 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 apart. 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. Seales 
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. 
The 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 theve 
are faint indications of markings similar to those of undulatus. 
Distinguished from horkelii 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 9.9, and width of pectorals 7.4 inches. 
Florida; South Carolina. 
