PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 85 



185.'> — Mi/lochcilHS lalcralin, Agassiz, Am. Journ. Sci. aud Arts, p. 231. 



Mijlovheilnn laicralLs Giuard, Proc. Acad. Nat. Sci. Phila. p. 1(J9, 185G. 



Mijlo.^hcilioi hitmiUs GiHAKD, Pac. R. R. Expl. p. 213, pi. 48, f. .5-8, 1858. 



Alijlochilus /«/M-rtZ(8 Jordan A: Coi'eland, Bull. Rutlalo Soc. Nat. Hist. p. 155, 187(). 

 W^G—AIijloclicihtsfiatercitlt(s Giuakd, Proc. Acad. Nat. Sci. Phila. p. 169. 



Mylocheilas fraterculus Girakd, Pac. R. R. Expl. s, p. 215, pi. 45, f. 1-4, 18.58. 



Alylocheilus fratirculus Coopeu, Nat. Wealth Cal. by Cronise, p. 496, 1868. 



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

 1876, (name ouly). 



. Habitat. — Northern Califoruia to British Columbia. 

 My specimous agree perfectly with Dr. Gunther's descriptiou of his 

 Leucosomns cauririiis, wbich was taken iu part from Richardson's orig- 

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

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

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

 sheatli on the jaws. There is nothing in Girard's trivial descriptiou of 

 Mylochilm fraterculus to indicate distinction. I therefore follow Dr. 

 Giinther in considering 71/. lateralis aud M. fraterculus as mere synonyms 

 of M. caurinus. The genus Mylochihis resembles iu form, sqnamatiou, 

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

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

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

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

 me the teeth 2, 5-5, 2, the teeth of the smaller row quite small aud 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. 1 find no trace of a third row in my speci 

 mens. 



The genus Mylopharodoii Ayres is perfectly distinct from Mylochilus, 

 the upper jaw being iion protractile, the dorsal behind the ventrals, 

 aud no l);irbel at the angle of the maxilhiry. Mylopharodoii thus far 

 apparently contains but a sin;;le species, the types of Gila conocephala 

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

 conspecific. 



A REVIKW OF THK AMEKICAIV S1»E€IES «F THE «EXUS SCOPS, 



SAVIG.-VY. 



By ROBEKT RlDtJWAY. 



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

 admiral)le work oti the Strigidw,* I had ])aid 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 1 may name in particular Mr. Osbert 



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

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



