FISHES 39 



P. stanleyi Kendall. Length 230 mm.; head 4.5; depth 4.3; color 

 of back blue-black; sides and belly yellowish; body of male and of 

 many females covered with white tubercles; rays of dorsal hn 10; anal 

 11; scales 10-82-7: lakes of Maine; abundant. 



P. quadrilateralis Richardson. Menominee whitefish; frosthsh. 

 Length 300 mm.; head 5.5; depth 4.5; color dark bluish above; silvery 

 beneath; rays of dorsal fin 11 ; anal 12; scales 8-90-7; branchiostegals 8; 

 gill-rakers short and stout ; body slender and elongate : the upper Great 

 Lakes and northward; lakes of the Adirondack region and ot New 

 England; common. 



P. williamsoni Girard. Rocky Mountain whitefish. Length 400 

 mm.; head 4.5 to 5; depth 4 to 5; color bluish above; sides silvery; fins 

 tipped with black; rays of dorsal and anal fins 10 to 13 ; scales 8 to 10-78 

 to 88-7 or 8; body elliptical, but little compressed; head short, conic: 

 from western Montana into Washington and Oregon; southward in 

 Nevada to the Truckee; common in clear streams and lakes. 



P. coulteri Eigenmann & Eigenmann. Length 200 mm.; color dull 

 silvery; rays of dorsal and anal fins 10 to 11 ; scales 8-60 to 63-6; body 

 heavy; snout .blunt: head waters of the Columbia; rare. 



P. spilonotus (Snyder). Length 200 mm.; color silvery, spotted 

 with dusky spots, which disappear with age; dorsal and anal fins with 

 II rays each; scales 11 -80-8; maxillary reaches eye: Bear Lake, Idaho, 

 in deep water. 



P. ahyssicola (Snyder). Length 225 mm.; color silvery; rays of 

 dorsal fin 10, of ventral fin 11; scales 8-75-7; rnaxillary very short, not 

 reaching the eye: Bear Lake, Idaho, in deep water. 



3. Irillion Jordan. Similar to Prosopium, but with a very long 

 sharp snout, and a large adipose fin: i species. 



I. orcgonius (Jordan & Snyder). Chisel-mouth jack. Length 

 425 mm.; head 4; depth 5; color silvery; rays of dorsal and anal fins 12; 

 scales 9-86-6; body long and slender; snout very long, with a fleshy 

 tip; adipose fin very large: basin of the Columbia; common. 



4. Leucichthys Dybowski. Ciscoes; lake herrings. Similar to 

 Coregonus but dift'ering from it in having a larger mouth and longer 

 jaws, the premaxillaries being horizontal in position and the lower jaw 

 usually more or less projecting; gill-raker very long and slender; jaws 

 toothless: numerous species, in the northern hemisphere, 19 in the 

 United States, 8 in Arctic America; all valuable food fishes. 



L. harengus (Richardson). Length 300 mm.; head 4.3; depth 4.5; 

 body elongate; color dark bluish above; silvery on the sides; rays of 

 dorsal fin 11; anal 12; scales 10-83-9; adipose fin very small: shallow 



