150 CONTRIBUTIONS TO NOETH AMERICAN ICHTHYOLOGY III. 



FiDS moderate, the dorsal rays about 12, the aual 7 : pectorals 

 rather long, uot quite reaching ventrals : ventrals reaching vent : anal 

 tin high, reaching caudal : caudal fin rather long, its lobes equal. 



Scales moderate, large on the caudal x>eduucle, much smaller and 

 crowded anteriorly, GO to G5 in the lateral line, about 18 iu a transverse 

 series i'rom dorsal to ventrals. 



Sexual peculiarities unknown. 



Coloration usual. 



Air-bladder iu two parts. 



Size moderate or rather large. 



The single species now included in this genus is known only from 

 Utah Lake. Its describers referred it to the genus Catostomns, but 

 made no mention of, its singular mouth and lips. The original type of 

 the species is iu very bad condition, the mouth being shrunken and dis- 

 torted, and the bones of the head protruding through the skin, so that 

 the peculiarities of the species are hardly recognizable.* 



Gemric Characterizations. 

 Chasmistes Jordan, 1878. — " This genus is distinguished from Catostomus by the 

 very large, terminal mouth, the lower jaw being very strong, oblique, its length about 

 one-third that of the head. The lips are little developed, and are very nearly smooth. 

 The type of the genus is C. /ecHwrZus Cope & Yarrow." — (Jordan, Bull. U. S. Geol. Sun: 

 Terr. vol. iv, No. 2, p. 417, 1878.) 



ANALYSIS OF SPECIES OF CHASMISTES. 



* Depth about 5 in length ; head 3| ; interorbital space broad, 2| in head ; eye 6 to 7 

 in head; width of the open mouth 84 in head. Dorsal 12. Anal 7. Scales 

 9-63-8. Color dusky above, pale below ; the scales of the back and sides pro- 

 fusely covered with dark punctulatlons fecundus, 23. 



23. CHASMISTES FECUNDUS {Cope & Yarrotv) Jordan. 

 Sucker of Utah Lake. 

 1876 — Catostomus fecundus Cope & Y'aijroav, Wheeler's Expl. W. inoth Her. v, Zool. 

 678, pi. xxxii, f. 1, 1 a. 

 Catostomus fecundus ionxyxs & Copeland, Check List, 156, 1876. 

 Chasmistes fecundus Joi.dan, Bull. Haydeu's Geol. Surv. Terr. vol. iv, No. 2, 417, 

 1878. 

 Habitat, — Utah Lake, Utah, where it is excessively abundant. Not yet noticed 

 elsewhere. 



This singular species has been overlooked until quite lately. Dr. 

 Yarrow states that it " is abundant in Utah Lake, and is called Sucker 



*" In fact, this specimen iu its present condition looks to me more like Catostomus occir 

 dentalis, but the figure published by Cope & Yarrow represents C. fecundus. Both 

 species occur iu Utah Lake. 



