230 NORTH AMERICAN FAUNA. [No. 7. 



small, horizontal, the maxillary reaching vertical* from front of orbit, 

 equaling diameter of eye, 3£ in length of head. Interdrbital width, 3 

 in head. 



Teeth 2, 4-4, 2, hooked, with sharp edges. 



Pectorals nearly reaching base of ventrals, the latter long, overlap- 

 ping front of anal fin. Origin of dorsal fin midway between base of 

 caudal and middle of eye. 



D., 85 A., 7 Lat. 1. 56 (pores).. 10 scales in a series obliquely forward 

 to lateral line from base of first dorsal ray. 



Color in spirits, brown along back, a black band from snout across 

 cheeks and along middle of sides, with a narrow silvery streak above 

 it. Lower half of sides and belly silvery; an ill-defined dark streak 

 from base of pectorals back along sides to the end of the anal fin. A 

 small black spot on base of caudal. 



Three specimens were taken in a hot spring in Pahranagat Valley, 

 Nevada, May 25, 1891, by 0. Hart Merriam and Vernon Bailey. Tem- 

 perature of spring 36.11° C. (97° F.). 



Rhinichthys ('Apocope) nevadensis, sp. nov. (Plate vi, Fig. 1.) 



Type locality. — Ash. Meadows, Ainargosa Desert, on boundary between California 

 and Nevada. 



Differing from other known species in the large head, the short deep 

 body, very small eye, and in the reduction of the outer ventral ray to a 

 mer,e rudiment. 



Head, 3| in length (varying from 3 J to 4) 5 depth, 3| (varying from 3 .J 

 to 4). D., 8; A., 7. Lat. 1. 65. Ventrals apparently with seven rays, the 

 outer one rudimentary, and often to be detected with difficulty. . 



Body robust, with broad heavy head, the least depth of caudal 

 peduncle less than half the greatest height of body. Greatest depth 

 of head at occiput 5 in length of body (6£ in nubila of equal size). 

 Eye very small, half interorbital width, which equals distance from tip 

 of snout to middle of eye, and is contained 2f times in head. 



Mouth terminal, very oblique, the lower jaw included, the premaxil- 

 laries not at all overlapped by the snout. The maxillary reaches the 

 vertical from front of eye, and is one-third length of head. Maxillary 

 barbie well developed. 



Scales very irregularly placed, and difficult to enumerate. The lateral 

 line is incomplete in adults, and usually does not reach to opposite 

 dorsal fin. In the young it is variously developed, often extending, 

 though with many interruptions, to end of dorsal or base of caudal. 

 Pores in lateral line (when complete) 58, about 66 oblique series, counted 

 above lateral line. 



Pins small, the pectorals not reaching ventrals, the latter not to vent. 

 Pront of dorsal midway between base of caudal and middle of occiput. 



In spirits, the upper half of sides is speckled and marbled with brown ; 

 the belly and lower half of sides immaculate or sparsely spotted. A 

 broad dark lateral stripe usually present, becoming more conspicuous 



