GENUS CATOSTOMUS. 161 



the course of the hiteral lino and about 28 in a cross-series 

 from dorsal to ventrals : coloration very dark ; fins dusky ; 

 scales everywhere finely punctate. Size large, .tahoensis, 32. 

 gg. Body elongate, subterete, the depth 4J to 4f in length : head quite 

 long and slender, 4J to 4f in length, deprossed and ilattened 

 above, broad at base, but tapering into a long snout, which 

 considerably overhangs the large mouth : lips thick, coarsely 

 tnberculate, the upper lip narrow, with 2 or 3 rows of 

 tubercles: eye ratbor small, behind the middle of the bead: 

 scales very small, much crowded forw.rrds, 95 to 114 in the 

 course of the lateral line, and about 29 (26 to 31) in a cross 

 row from dorsal to ventrals : dorsal rays 10 or 11 : males in 

 spring with the head and anal fin profusely tnberculate, the 

 tubercles on the head small ; the sides at that season with a 

 broad rosy band: size large; the largest species in the 



genus LOXGIROSTRIS, 34. 



ff. Upper lip very broad, with several (5 or 6) rows of largo i)apill2B. 

 i. Body long and slender, subterete, compressed behind, tho form 

 essentially that of C. lonfjb-ostris, the depth contained 5^ times 

 in the length : head large, 4 in length of body, the interorbital 

 space broad and flat, 2A in length of head: eye small, high up 

 and rather posterior : preorbital bone very long and sU^nder, 

 its length about three times its depth : mouth large, precisely 

 as in C. latipinnis, the upper lip pendent, very large, with 5 to 

 8 series of tubercles : dorsal fin not elongated or especially 

 elevated, its rays 11, the beginning of the dorsal much 

 nearer base of caudal than snout : caudal fin long and strongly 

 forked : anal fin long and high, reaching base of caudal : ven- 

 trals not reaching vent : caudal peduncle stout and deep, its 

 least depth more than one-third length of head, its kngth 

 about two-thirds that of head : scales quite small, about as in 

 longirostris, the exx»osed portion not notably lengthened: 

 chest with well-developed scales ; scales lG-100-14 : coloration 

 dusky brown, a dusky lateral band, pale below, tlic dark colors 

 extending low ; snout quite dark : size large . . i:kti!01'INNIS, 35. 

 ii. Body slender and elongate, the caudal peduncle especially long and 

 very slender, the depth 5J in the length : head moderate, 4f 

 in length, rather slender, with prominent snout and rather 

 contracted, inferior mouth ; outline of the mouth triangular, 

 tho apex forwards; the lips very thick, greatly developed, 

 lower lip incised to the base, its posterior margin extending 

 backwards to opposite the eye: jaws with a slight cartila- 

 ginous pellicle : eye small, high up : preorbital bone broad, 

 scarcely twice as long as deep: scales long and low, posteri- 

 orly rounded, their horizontal diameter greater than the ver- 

 Bu!!, N. M. No. 12—11 



