PERCOMO11PH1 COTT1DAE UKANJDAE VHEELEKI. 



697 



opercular spine .strong; the decurved small and obtuse. Palatine teeth 

 present ; end of maxillary reaching line of pupil. Isthmus as wide as 

 length of muzzle and orbit to front line of pupil. Skin everywhere smooth. 



Total length, O m .084 ; length less caudal tin, O ra .069 ; length to anal, 

 O m .042 ; length to first dorsal, (T.031 ; length of head, O m .022 ; width at 

 maxillaries distally, O m .0125 ; at preopercular spines, O m .0185. 



From Beaver River, Southwestern Utah, and from Rio San Juan 

 Pagosa, Colo. The other species of the Rocky Mountains ( U. punctulata, 

 Gill) has, according to that zoologist, a much wider head, especially in the 

 frontal region. This character is well exhibited by specimens in other col- 

 lections. 



Found tolerably abundant in pools left near the river after the spring 

 floods had ceased ; living under stones ; movements very sluggish. 



Dedicated to Lieut. G. M. Wheeler, in charge of explorations west of 

 the one hundredth meridian. 



It may be mentioned, in addition to the species enumerated from Provo 

 River and Utah Lake, we were informed of the occasional taking of a small 

 fish called "Mountain Mullet", the description of which does not appear to 

 apply to any of those already known from this locality. We were also 

 informed that a small species called "Bullhead" is found under stones in 

 the river bed, the colors of which are gray, spotted with black, having a 

 very large head, with green eyes and very spiny fins ; no scales. This is 

 doubtless a cottoid, and it is much to be regretted no specimens were pro- 

 cured. 



RECAPITULATION OF THE SPECIES. 



The preceding investigation of the Ichthyology of the Southwestern 

 Territories is sufficiently complete to throw much light on questions of geo- 

 graphical distribution. We therefore append lists of the ichthyic fauna? of 

 the distinct water sheds and basins embraced within its scope. These are 



