434 GEOLOGICAL SURVEY OF THE TERRITORIES. 



With the Salmo virginalis, probably from near Fort Bridger, from the 

 head- waters of the Green Eiver or Western Colorado. 



Catostomidce. 



I have proposed to adopt as valid (Proc. Amer. Philos. Soc., 1870, 

 480) seven genera of this family. I would now add an eighth, which 

 embraces species which combine with the characters of Catostomus 

 proper, a complete union of the parietal bones, which obliterates the 

 fontanelle so universal amoDg the suckers. The only other exception is 

 seen in Oycleptus, Eaf, as I have already mentioned. In all the members 

 of the family where I have examined it, this fontanelle is quite open and 

 of no doubtful proportions, and nowhere reduced to the slit often seen in 

 the Siluridw. In searching for the characters of Girard's so-called 

 genera Minomus and Acomus, I find that the type of the former, M. 

 insignis, B. G., presents the character above mentioned. 1 therefore 

 adopt his name for the new genus, and add two new species, M. delpM- 

 mis and M. bardus. Whether his two other species, M. plebeius and 3L 

 ■clarhii, belong to it is uncertain as yet, but they have the same physi- 

 ognomy. 



CATOSTOMUS, (LES.) 



Several species of this genus were procured by Dr. Hayden. Foi 

 their fuller elucidation the following table, embracing also those oi 

 Minomus, is appended. 



I. Scales of the posterior part of the body materially ") 

 larger than those of the anterior. 



a Anterior dorsal ray nearly equidistant between end of 



muzzle and base of caudal fin. , g ar i seUi , 



Head five and a half times in length to end of caudal ; j ' J 



muzzle j>rojecting, upper lip pendent, very short, with 

 <■ two rows tubercles ; smooth margins narrow ; scales J 



1. tr. 28 j eye ±-ihead; V. 10. ] 



As the last, but the lips much larger ; upper with three ) 



rows tubercles, and both with wide smooth margin; > G. discobolus. 



eye, 5.5 in head, V. 9 ; isthmus wider. ) 



II. Scales of body subequal. ■ 1 

 a Origin dorsal nearer origin of caudal fin than end of 



muzzle. I 2j- fotohtoqo 



Upper lip not pendent ; head one-fifth length to end of ' ^ 



caudal ; upper lip wide, D. 11, V. 10 ; scales tr. 1. 30 ; 



ventral fins small. 3 



aa Origin of dorsal fin nearer end of muzzle than basis } 



of caudal. j 



Head five and a half times in length with caudal; upper > M. bardus. 



lip wide, not pendent; isthmus wide; eye, one-fifth, 



head ; 1. tr. 30 ; D. 11, V. 10 : a light band on side. ) 



Catostomus sucklii, Girard ; United States Pacific Bailroacl Eeport, 

 X, p. 226, PI. LI.— Waters of the Platte. 



Catostomus latipinne, Baird and Girard ; Pr. A. N. Sci., Phil., 1853, 

 388 ; United States Mexican Boundary Survey, III, 39, PI. XXIV, 1-6. 

 (Acomus, Girard.) — Two heads from the Greeu Biver. 



Catostomus griseum, Girard ; Pr. A. K Sci., Phil., 1856, 174 ; United 

 States Pacific Bailroad, X, 222, PI. XLIX, figs. 5-9. — Two specimens 

 from Horse Creek, (waters of the Platte, August 27th,) one from Keel 

 Cloud Creek, and three from other waters of the Platte. 



