. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. FISH FAUNA OF LAKES OF SOUTHEASTERN OREGON. 87 Kutilus oregonensis, new species. This name is here applied to a distinct form found in the isolated lake basins of southeastern Oregon. It is very similar to closely related forms fotmd in the Sacramento. Klamath, and C()lum1)ia .systems, but differs widely from E. ol^liaccus of the Lahontan sy.«tein in important dental characters, the latter .species having the pharyngeal teeth 5-5. It differs from the more nearly related forms as follows: From A', thalansiniis in having shorter fin
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. FISH FAUNA OF LAKES OF SOUTHEASTERN OREGON. 87 Kutilus oregonensis, new species. This name is here applied to a distinct form found in the isolated lake basins of southeastern Oregon. It is very similar to closely related forms fotmd in the Sacramento. Klamath, and C()lum1)ia .systems, but differs widely from E. ol^liaccus of the Lahontan sy.«tein in important dental characters, the latter .species having the pharyngeal teeth 5-5. It differs from the more nearly related forms as follows: From A', thalansiniis in having shorter fins, a greater number of scales in the lateral line, in the series before dorsal fin. and above lateral line, and als(^ in usually having one less dorsal ray; from R. bicolor in having generally a larger head, smaller scales, there being a greater nuraljer in the lateral series, between occiput and dorsal fin and above the lateral line; from R. columbianus in having smaller scales and in other minor points. These differences are shown in greater detail in the tabulated comparisons of the four forms, page 94 et seq. Description of tj-pe no. 55596, U. S. National Museum, from XL Spring, Abert Lake, Oregon: Total length 202 mm. Head in length to base of caudal; depth ; depth caudal peduncle 9; depth head at occiput 5; length snout in head; maxillary ; diameter eye ; width .space between eyes 3; height dorsal ; anal ; length pectoral ; ventral 2; caudal ; scales lateral line 52; above lateral line 13; between lateral line and origin of ventral 8; between occiput and origin of dorsal Fig. 3.—Rutilus oregonensis, new species. Tyi)e. Body deep and hea\'y, the dorsal contour with an abrupt elevation at occiput. Mouth very oblique; maxillarj- extending to a perpendicular through nostril, not nearly reaching anterior border of orbit. Gillrakers on first arch 14, verj- short, not equal to half the diameter of puiiil. acutely pointed. Teeth (from cotypes)
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