GOG CONTRIBUTIONS TO NORTH A:MERICAN ICHTHYOLOGY IV. 



backward on both sides of the lateral Hue to the middle of the second 



dorsal, the band narrower and the prickles smaller posteriorly. 



(Cotfopsis gulosus Grd. Proc. Acad. Nat. Sci. Pliila. 1854, 129: Centridermichthys 

 gulosus Giinther, ii, 170.) 



105§. U. i>uuctulata (Gill) Cope. 



Light olivaceous; body covered with small black spots, which become 

 larger and more scattered behind; soft dorsal, pectorals, and caudal 

 thickly spotted; spinous dorsal without dark blotch. Head long and 

 wide. Mouth quite large; maxillary reaching past front of orbit; 

 preopercular spine strong, directed obliquely backward and upward. 

 Head 3; depths. D. YIII-17; A. 13. {Gill.) Bridger's Pass; distin- 

 guished from the other species by the speckled coloration. 



(Potamocottus punctnlatus Gill, Proc. Bost. Soc. Nat. HLst. 1861, 40, and in Ichth. 

 Capt. Simp. Expl. 1876, 402.) 



1039. U. bcndirei (Bean) J. & G. 



Uniform dark brown above, lighter below. Maxillary extending just 

 beyond front of eye; eye 4 in head; preopercle with 4 spines, the upper 

 one half as long as the ey^e. Pectorals reaching origin of anal; ven- 

 trals not to vent. Depth 4. D. VIII-16; A. 12; T. I, 3. Walla-Walla, 

 Wash. [Bean.) 



{Potamocottus hendirei Bean, Proc. U. S. Nat. Miis. 1881, 27.) 



1060. U. ricSiardsoaii (Agassiz) J. & G. — Miller^s Thumb; Bloh; Mujjle-jaw; 

 Bull-head. 



Olivaceous, more or less barred and speckled with darker; fins 

 mostly barred or mottled. Body slender or stout, tapering regularly 

 backward to the tail; vertex somewhat depressed; interocular space 

 with a groove; preopercle with a short sharp spine, little hooked, 

 directed backwards and upwards, mostly covered by the skin ; below 

 this are 2 smaller concealed spines; subopercle with a stoutish spine, 

 directed forwards. Skin smooth, except the region immediately behind 

 the pectorals, which is beset with very small sharp prickles which are 

 sometimes obsolete; lateral line conspicuous, continuous or interrupted 

 behind; first dorsal low and feeble; i>ectoral fins large, their length 

 nearly equal to that of the head, their tips usually reaching beyond the 

 origin of the soft dorsal; ventral fins moderate; isthmus very broad, 

 the gill-membranes not forming a fold across it. Head 3^ ; depth A-'o. 

 D. Yl to VIII-16 or 17; A. about 12; V. I, 4. L. 3-7 inches. Middle 

 and Northern States, abounding in all clear rocky brooks and lakes; 

 extending southward along the AUeghanies to Alabama. 



