FISHES 141 



C. ictalops (Rafinesque) . Miller's thumb (Fig. 63). Length 150 

 mm.; head ;^.7,; depth 4 to 6; color olivaceous, barred or speckled with 

 darker; rays of dorsal fins VI to VIII, 16 or 17; anal about 12 : middle or 

 northern States from New York to the Dakotas; southward along the 

 Alleghenies to Alabama; very common in clear brooks and lakes; very 

 variable. 



C. klamathensis Gilbert. Length 130 mm.; head 3; depth 4 to 4.3; 

 color brownish olive, much blotched with darker; rays of dorsal fin VII, 

 19; anal 14; the 2 dorsal fins broadly joined; lateral line very incom- 

 plete; preopercle with a single short spine: Klamath Lakes, Oregon; very 

 common. 



C. heldingi Eigenmann. Length 100 mm.; head 4; depth 5; color 

 mottled black and white, with 6 blackish cross bars on the back, the 

 first across the head behind the eyes; rays of dorsal fin VI to VIII, 15 to 



Fig. 63. — Coitus iclalops {from Fishes of Illinois). 



18; anal 11 to 13: abundant east of the Cascades, Columbia River 

 basin. 



C. annce Jordan & Sparks. Length 75 mm.; head 3.5; depth 5; color 

 light gray, somewhat mottled; rays of dorsal fin VII or VIII, 17 or 18; 

 anal 12; mouth very small; preopercle with i blunt spine and no others: 

 Colorado River basin; common. 



2. Uranidea DeKay. Similar to Cottus, but differing from it in 

 the small size of the ventral fins which contain i concealed spine and 3 

 soft rays; skin smooth; palatines without teeth: 9 species, in cold 

 streams in the northern States, from New England to the Pacific. 



U. hendirei (Bean). Length 75 mm.; color dark brown, lighter on 

 the throat and belly; rays of dorsal fins VIII, 16; anal, 12; palatines 

 with teeth; preopercle with 4 spines: Columbia basin in Oregon and 

 Idaho. 



U. tenuis Evermann & Meek. Length 75 mm.; head 3.8; depth 7; 

 color dark above and pale beneath; under side of head speckled; rays of 

 dorsal fins VI-I, 17; anal 15; body very slender: Klamath Lakes, Oregon. 



