Cottus l{lamathensis Gilbert Klamath Muddler 

 Lateral line practically complete; Pacific States 

 Cottus aleuticus Gilbert Coast Sculpin 



294. With a mottled pattern; Colorado Valley 



Cottus annae J. & S. Colorado Muddler 

 With dark cross bars; Columbia Valley 



Cottus heldingii E. & E. Columbia Muddler 



295. With two dorsal fins distinctly separate from each other, or else small 



fishes, under three inches, with the body depth less than one-fourth 

 the length 296. 



With one dorsal fin, sometimes with the spiny portion almost separated 

 from the soft portion by a deep notch, but retaining some connection 



357. 



296. Pelvic fins abdominal; seldom over three and one-half inches long; Fam' 



ily Athenmdae Silversides (many marine species) 297. 



Pelvic fins jugular or thoracic 298. 



297. Jaws long and flat, like a pickerel's; N. Y. to Florida and Texas 



Lahidesthes sicculus (Cope) Brook Silversides 

 Jaws not so; mouth small; in fresh and brackish waters of the Atlantic 

 and Gulf coasts 



Menidia heryllina (Cope) Silverside 



298. Lateral line absent or almost so 299. 

 Lateral line more or less complete 304. 



299. Tail fin slightly emarginate; not over two inches long; in fresh water; 



Family Etheostomidae (part) Darters 300. 



Tail fin rounded or pointed; usually in brackish water or in fresh water 



near the coast 302. 



300. With one anal spine; Arkansas to Texas 



Alvarius fonticola J. & G. Midget Darter 

 With two anal spines 301. 



301. Cheeks scaly; Alabama and Mississippi 



Mtcroperca proeharis Hay 

 Cheeks not scaly; Arkansas to Minn, and Michigan 



Microperca punctulata Putnam Least Darter 

 iVlicroperca microperca (J. 6? G.) 



302. Pelvic fins separate; adults one to two feet long; southern Atlantic and 



Pacific coasts; Family Eleotridae (species mostly marine) 



Dormitator maculatus (Bloch) Striped Sleeper, Guavina 

 Pelvic fins united; usually only a few inches long; Family Gobiidae 

 Gobies (many marine species) 303. 



303. Scales minute, inconspicuous, smooth edged; California 



Eucyclogohnis newherryi (Girard ) 

 Scales larger, rough edged; Gulf coast 

 Rhinogobius shufeldti (J. 6? E.) 

 (Gobius shufeldti J. & E.) 



304. With three or more spines in the anal fin (anterior spine often minute) ; 



293 



