PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 85 



1855— Mylocheilus lateralis, Agassiz, Am. Jouru. Sci. and Arts, p. 231. 



Mylocheilus lateralis Girard, Proc. Acad. Nat. Sci. Phila. p. 1(59, 1856. 



Mylocheilus lateralis Girard, Pac. R. R. Expl. p. 213, pi. 48, f. 5-8, 1858. 



Mylochilus lateralis J ord an & Copeland, Bull. Buffalo Soc. Nat. Hist. p. 155, 1876. 

 IS06— Mylocheilus fraterculus Girard, Proc. Acad. Xat. Sci. Phila. p. 169. 



Mylocheilus fraterculus Girard, Pac. R. R. Expl. x, p. 215, pi. 45, f. 1-4, 1858. 



Mytocheilus fraterculus Cooper, Nat. Wealth Cal. by Crouise, p. 496, 1868. 



Mylochilus fraterculus Jordan & Copeland, Bull. Buffalo Soc. Nat. Hist. p. 155, 

 1876, (name only). 



Habitat. — Northern California to British Columbia. 



My specimens agree perfectly with Dr. Gtinther's description of his 

 Leucosomus caurinus, which was taken in part from Eichardson's orig- 

 inal types, except that the size of the eye in my fishes is proportionally 

 larger. Agassiz's account of Mylocheilus lateralis answers in a general 

 way, except that I find no trace of anything which can be called a horny 

 sheath on the jaws. There is nothing in Girard's trivial description of 

 Mylochilus fraterculus to indicate distinction. I therefore follow Dr. 

 Giinther in considering M. lateralis and M. fraterculus as mere synonyms 

 of M. caurinus. The genus Mylochilus resembles in form, squamation, 

 etc., the genus Gila. It has, however, a much smaller mouth than most 

 of the species of that genus. Its relations are rather with Pogonichthys 

 and Platygobio, from both of which it differs in the peculiar form of its 

 teeth as well as in the number of teeth. I find in the specimen before 

 me the teeth 2, 5-5, 2, the teeth of the smaller row quite small and close 

 together, and the innermost of the larger row much enlarged and trun- 

 cate, gradually diminishing in size to the uppermost, which is slender, 

 compressed, and hooked. I find no trace of a third row in my speci- 

 mens. 



The genus Mylopharodon Ayres is perfectly distinct from Mylochilus, 

 the upper jaw being non-protractile, the dorsal behind the ventrals, 

 and no barbel at the angle of the maxillary. Mylopharodon thus far 

 apparently contains but a single species, the types of Gila conocephala 

 B. & G. and Mylopharodon robustus Ayres being, so far as I can see, 

 couspecific. 



A REVIEW OF THE AMERICAN SPECIES OF THE GENUS SCOPS, 



SAVIGNY. 



By ROBERT R1DGWAY. 



Previous to the publication, some two years since, of Mr. R. B. Sharpens 

 admirable work on the Strigidce* I had paid considerable attention to 

 the study of the American Scops-owls, but the lack of sufficient material 

 prevented my reaching any very positive conclusion as to several forms 

 of questioned validity. More recently, however, through the assistance 

 of several friends, among whom I may name in particular Mr. Osbert 



* Catalogue of theStriges, or Nocturnal Birds of Prey, in the Collection of the British 

 Museum. By R. Bowdler Sharpe. London : Printed by order of the Trustees. 1875. 



