PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 461 



Form of the species termed ^^Clinostomns^', but less compressed. Body 

 moderately elongate, somewhat compressed, symmetrical, the back 

 considerably arched ; caudal peduncle rather stout. Head subconical, 

 latertilly compressed, broad and rounded above; mouth short, oblique, 

 jaws about equal. Premaxillary in front on the level of the lower edge 

 of the pupil; maxillary reaching to opposite the front of the eye. Eye 

 large, about as long as snout, 4i in head. Isthmus narrow; scales firm, 

 not closely imbricated ; the belly with imbedded scales. Lateral line 

 complete, running low, but not greatly decurved. Dorsal fin inserted 

 a little behind the ventrals, scarcely nearer base of caudal than snout. 

 Caudal tin eveiiiy forked. Pectorals shortish, not reaching nearly to 

 the ventrals ; the ventrals reaching to the 's^ent. Dead contained 4 times 

 in length to base of caudal; greatest depth equal to length of head 

 Fin-rays: Dorsal 0; anal 8. Scales ll-5!5--0. Teeth 2, 5-4, 2, without 

 evident masticatory surface. This latter character is, however, so v;iri- 

 ablein the Cvpnuoids of this tyi>e as to be scarcely' even of specific 

 value. Hack and fins dusuy bluish; sides of body and head dark, with 

 tine punctulations ; a red si)ot at base of each ventral and of anal. 



Numerous specimens, the longest (i inches in length. This species is re- 

 lated to IS. iirdeshivvH (Cope), but it has a deeper body and larger scales, 

 the pectorals are shorter anil length of the head proportionately Tess. 



7. Squalius copei, s;i. nov. 



{Hubupsis egrcgiiis CoTpe, Aun. Eept. U. S. Geol. Surv. Terr. 1870,438; Cope 

 & Yarrow, Wheeler's Expl. W. lOOtli Mer. v, 662, 1877; uot Tvjoma 

 egrcgia Girard. ) 



Numerous specimens of this species were obtained at Evanston, Wyo., 

 of boys fishing with hook and line in tributaries of Bear Eiver. It 

 has not been observed in Utah Lake. As the original types of Tigoma 

 egregia, examined by us, have CG scales only in the lateral line, the species 

 called Tigoma egregia by Professor Cope is distinct from it, and may 

 receive the above specific name. 



8. Squalius atrarius (Girard) J. & G. 



This "chub" is very abundant iu Utah Lake. It is exceedingly 

 destructive to the young trout, well meriting the epithet of "devilish 

 chub" applied to it by JVlr. Madsen. 



9. Squalius rhomaleus, sp. nov. 



Allied to Squalius niger (Cope), but with the large scales of Squalius 

 squamatus (Gill). 



Body robust, elevated anteriorly, somewhat compressed or flat-sided, 

 although the back is very broad. Head broad, considerably concave in 

 profile as seen from the side, as in the groups called PlaU/gohio and Gila; 

 the interocular space flattish, scarcely raised above the level of the 

 upper edge of the eye. Snout rather broad, somewhat elevated at tip; 

 the premaxillary on the level of the j)upil ; the form of the head resem- 

 bling that of Chasmistes. Mouth very oblique, its cleft at an angle of 

 about 45°; the mandible much projecting. Maxillary extending to the 



