PLEGTOSPOISDYLI— GYPKINIDAE— GILA GULA. 



661 



taries, and is the most abundant fish in New Mexico It is a variable 

 species, frequently exhibiting a dental formula of 4.1-1.4; indeed, usually 

 so in small or immature individuals. The second tooth frequently displays 

 a small grinding face. The variation in squamation is given below. 



18 



Var. I. Scales, es ; eve six times in head, twice in interorbital width ; 

 n 



form stout. 



No. 





Locality. 



Date. 



Collector. 





207 





Sept., 1S74 



C. E. Aiken. 





Var. II. Scales of lateral line 59-63; eye 4.75 in head, 1.5 in interor- 

 bital width. 



19 



Teeth 4-5 and 4-4 in external row ; scales, «. 







No. 



Locality. 



Dat;e. 



Collector. 



107 





Aug., 1874 



Prof. E. D. Cope. 





17 



Scales, 59. 



10 



No. 



Locality. 



Date. 



Collector. 



(?) 







Dr 



H. C. Yarrow. 







GILA GULA, Cope, sp. nov. 



Plate XXX, Figs. 2, 2a. 



Allied to the last, and similar in squamation, but distinguished by a 

 robust habit, especially a large head, with wide front and wide mouth. The 

 eye enters the side of the head five times, and the interorbital width twice. 

 Head only three and one-half times in length, exclusive of caudal fin ; the 

 same is one-fourth this length in G. pandora. The depth enters the same 



in G. gula four and two-thirds times. Teeth, 4.2-2.5. Scales, w. Radii 



u 



