DESCRIPTION OF A NEW SPECIES OF CYPRINOID FISH, COUESIUS 

 GREENI, FROM THE HEAD WATERS OF FRAZER RIVER IN BRIT- 

 ISH COLUMBIA. 



BV 



David S. Jordan. 

 COUESIUS GREENI, sp. nov. 



Head 4^^ in length ; depth, 4:-^\. D. 8 ; A. 8. Scales, 10-57-7. Teeth, 

 2-4-4-2. Length of largest specimen, 6^ inches. 



Body robust, the back convex before the dorsal, the profile of head 

 straight and rather steep, the space between eyes broad and flatfish, 

 3^ iji head. Snout bluntish, but rather long, 3f in head ; the premax- 

 illaryjust above the level of the lower part of the pupil; maxillary 

 reaching almost to the front of the orbit, 3f in head ; barbel well de- 

 veloped, not quite at the end of the maxillary ; its length considerably 

 lessthanthatof pupil. Mouthmoderatelyoblique, the lower jaw slightly 

 included. Dorsal fin inserted behind the base of the ventrals and be- 

 hind the middle of the body at a point midway between the pre- 

 opercle and the base of the caudal, the fin of moderate height. Pec- 

 toral shortish, 1^ in head, ventrals nearly 2, Caudal well forked, 

 the lobes equal, If in head. Scales larger than in related species, 

 scarcely reduced forward and l)ut little smaller ori the back than on the 

 sides; 36 scales in front of the dorsal. Color dark olive above, the 

 sides reddish, silvery. Very slight traces of a lateral band, a dark 

 streak below the eye undulating and extending from the side of the 

 upper jaw to the opercle. Lining of shoulder gradually dusky. Fins 

 without definite markings, the upper somewhat dusky. 



This species is related to Couesins pJumhens of the Upper Missouri 

 and Lake Superior region, from which species it differs in the larger 

 size of the scales and in some details of form. The head is especially 

 large and heavy. 



Two specimens of this species were received from ]\rr. Ashdown H. 

 Green, of Victoria; the larger specimen, measuring 6^ inches, is in the 

 museum of the Leland Stanford Jr. University; the second specimen, 

 measuring 3| inches in length, has been sent to the U. S. National Mu- 

 seum. The specimens were obtained by Mr. Green in Stuarts Lake, 

 near Fort St. James, in British Columbia. This lake is near the 

 head waters of Frazer's Eiver. Mr. Green says: "1 am told that this 

 is the only lake, in that part of the country at least, where tbese fishes 

 are found." 



Proceedings Jfational Museum, Vol. XVI— No. 938. 



313 



