558 FISHES FROM THE GILA RIVER, ARIZONA. 



"Color (December) dark brown with. a brassy reflection, yellow be 

 low. Iris brown, reddish tinted. Pharyngeal teeth in a single row 

 small, numerous, over 35." (Carpenter.) Peritoneum black; intestint 

 simple, 5i times length of body. Head 4 in body ; depth I ; D. 13; A 

 7; scales 17-77-12. 



6. Ptychochilus lucius Girard. — Gila Salmon. 



One specimen, 15 inehes long. It agrees in general with Jordan »S, 

 Gilbert in Synopsis Fishes North America. "Peritoneum silvery 

 vertebra) 45 to 46." (Carpenter.) 



7. Gila emorii Baird it Girard. — Gila Trout; Bony Tail. 



Six specimens ranging from 8 to 14 inches in leugth. They agree 

 with the description of Jordan & Gilbert in Synopsis Fishes North 

 America, except in the following characteristics : In the greater number 

 of specimens the maxillary does not reach to the front of the orbit ; thci 

 pectorals not quite reaching to front of pubic bones ; front of dorsal 

 about equal to distance between tip of snout and base of caudal fin 

 measured on the lateral line ; least depth of caudal peduncle 4 in its 

 length. 



" Color (October), back dark, sides light, belly bright silvery ; dorsal 

 darker, caudal brown; iris pink tinted. Peritoneum dusky. Pharym 

 geal bone falciform, with several foramina) interiorly. Teeth, pharyn- 

 geal, falcate, compressed, with grinding surface, usually but two or? 

 three of the large teeth worn ; 2, 5-4, 3, sometimes 2, 5-4, 2. Vertebra} 1 

 42 to 45. Scales 20-87 to 90-21. Large specimens in November show 

 but slight grinding surface. The food of this species consists almost 

 entirely of Gasteropods and caddis-worms, which they crush with their 

 powerful pharyngeals. As they do not feed much during winter, the 

 grinding surface is almost obliterated at that season through disuse ; 

 the species might thus have been described as without grinding surface. 



"The young differ greatly from the old; the cranium probably 

 not becoming depressed until the second year. A specimen found 4 

 inches in length with the cranium not perceptibly depressed, and the 

 eye 4 in head. In spring the iris is reddish. They are very tenacious 

 of life. They have revived after being several hours out of the water 

 and having become perfectly dry and stiff. They take the hook freely." 

 (Carpenter.) 



Indiana University, April 10, 1880. 



