54 PROCEEDINGS OF THE ACADEMY OF [Feb., 



than in Deltistes. Gilbert mentions two Klamath Lake species 

 of Chasmistes. Chasmistes stomias Gilbert^- "has a larger, deeper 

 head, with larger, more obliquely placed mouth, and conspicuously 

 protruding premaxillary spines." The scales are 76 to 82, and thus 

 this nominal form appears more clearly identical with Chasmistes 

 brevirostris than the form he lists under that name.^^ Chasmistes 

 copei Evermann and Meek^* has 80 scales, and is said to differ from 

 Chasmistes stomias Gilbert in "its larger head, larger, more oblique 

 mouth, less prominent snout, and very small fins. The differences 

 in the fins are very great, particularly in the ventrals." In the 

 case of Gilbert's figure of Chasmistes stomias a spawning-fish is shown, 

 thus the ventrals and anal are unusually long. Chasmistes chamher- 

 laini Rutter ^^ agrees with all the forms of Lipomyzon, so far as known, 

 in having the lower lip united at the mandibular symphysis, and 

 differs in having 93 scales. 



PITHECOMYZON subgen. nov. 

 Type Chasmistes cujus Cope. 

 Differs from subgenus Lipomyzon Cope in the large scales, these 

 about 65 in the lateral line (70 to 90 in Lipomyzon). 



(UtOrj/.,,^^ ape, with reference to the short snout; m6C«w, to suck.) 



Lipomyzon cujus (Cope). 



Chasmistes cujus C9pe, Proc. Acad. Nat. Sci. Phila., 1883, p. 149. Pyramid 

 Lake, Nevada. 



No. 20,523, A. N. S. P., type of Chasmistes cujus Cope. Pyramid 

 Lake, Nevada. E. D. Cope. It only measures 17 inches, which 

 may be due to the body having been skinned out and shrinking 

 in alcohol. Cope gives the eye as 8^, likely the actual diameter 

 of the eye and not the orbital socket. 

 Deltistes luxatus (Cope). 



Chasmistes luxatus Cope, Amer. Nat., XIII, 1879, p. 784. Klamath Lake, 

 Oregon. 



No. 20,555, A. N. S. P., cotype (type) of Chasmistes luxatus Cope. 

 Klamath Lake, Oregon. E. D. Cope. 



No. 20,960, A. N. S. P., cotype, same data, in poor preservation. 

 Xyrauchen texanus (Abbott). 



Catostomus texanus Abbott, Proc. Acad. Nat. Sci. Phila., 1860, p. 473. 

 Colorado and New Rivers. 



No. 16,993, A. N. S. P., type of Catostomus texanus Abbott. 



^Bull. U. S. F. Com., XVII, 1897 (1898), p. 5. fig. 



13 L.c. 



» L.c, p. 70, fig. 



15 L.c, XXII, 1902 (1904), p. 147. Eagle Lake, California. 



