4 



are scarcely enlarged at all The base of D. I. is nearer the basis of the 

 caudal fin than the end of the muzzle, by the length of the latter to 

 the posterior nares. Caudal fin deeply forked. Total length M. 0.085 ; 

 ditto to basis caudal fin .0685 ; ditto to basis anal .047 ; ditto to basis 

 ventral .0325; ditto of head .018; to orbit .043; width at posterior 

 nares .006 ; at middle of pterotic .009. Color, silver to half way between 

 lateral and dorsal lines, the upper part of it underlaid by a lead-colored 

 band ; a median dorsal black band from front to caudal fin. 



Numerous specimens from the Colorado Chiquito river, Arizona, col- 

 lected by Dr. Newberry, Jr., (5x). The largest species of the group. 



LEPIDOMEDA JAUROVII, sp. nov. 



A species resembling the last in many respects, but differs in a 

 greater el jmgation of form, weakness of squamation and peculiarity of 

 coloration. The fin radii are similar in number and character, but the 

 dorsal is furnished with more slender spines. The chin projects a little 

 beyond the upper lip when the mouth is closed. The depth of the body 

 at the ventral fins enters the length to the basis of the caudal 5 to 5.25 

 times, and the head enters the same four times. The eye is larger than 

 in L. vittata, entering the length of the head 3.25 times and equalling the 

 interorbital width. The end of the maxillary bone reaches the line of 

 the anterior border of the orbit. The pectoral fin reaches the ventral, 

 but the latter does not attain the vent. The scales are difficult to detect ; 

 there are 51 transverse series between the head and the dorsal fin. Total 

 length, M. 0.081 ; do. to caudal fin .065 ; do. to anal .0465 ; do. to ven- 

 tral .032; do. of head .0165; do. to orbit .0048 ; width between orbits 

 .005 ; do. between middle of pterotics .008. Color olivaceous above 

 with a median black vertebral band ; sides to above lateral line silvery, 

 leaden edged above. Bases of ventral fins red. 



From the Colorado Chiquito river, Arizona. Dedicated to Dr. Henry 

 C. Yarrow, Zoologist of the survey under Lieut. Wheeler (No. 505). 



The following species were also obtained by the expedition from Utah 

 Lake, the largest body of pure fresh water in the basin of the Rocky 

 Mountains, others of equal size being alkaline or salt. 



, SALMO VIRGINALIS, Girard, 



Maintains its distinctness from S. pleuriticus, Cope, from the streams 

 which flow from the mountains on both sides, in its more slender form of 

 head and body. The depth enters the length 5. 75 and 6 times, and 

 equals the length of the head to the preoperculum. In 8. pleuriticus 

 of equal size, it enters the length 4.66 times, and nearly equals the 

 length of the head. 



COREGONUS VILLIAMSONII, Girard. 



SIBOMA ATRARIA, Girard. 



The largest of the lake Cyprinidte, specimens procured weighing one 

 and two Ibs. 



