PLEGTOSPONDYLI GYPRINIDAE GILA GULA. 



661 



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

 species, frequently exhibiting a dental forarala of 4.11.4; indeed, usually 

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

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



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

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form stout. 



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

 bital width. 



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



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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 



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



11 



