Jordan and Evermann. Fishes of North America. 1103 



Poecilichthys gracilis, JORDAN & GILBERT, Synopsis, 521, 1883. 



EtheosioiiKi fusifornte, EVERMANN & KENDALL, Bull. U. S. Fish Comm., xn, 1892 (1894), 115; Bou- 

 LENUER, Cat., i, 75; and of authors generally. 



1495. BOLEICHTHTS EXILIS, Qirard. 



Head 3fj depth nearly 6. D. IX or X-10 or 11; A. II, 7 to 9. Body 

 compressed, tapering toward the caudal peduncle, which is slightly con- 

 tracted. Maxillary reaching anterior edge of pupil. Lateral line nearer 

 dorsal than the abdominal outline; pectorals extending beyond ventrals. 

 Cheeks naked, yellowish brown, speckled with grayish black; dorsals 

 and caudal barred; a dark spot on occipital region, and a streak in 

 advance of as well as below the orbit. (Girard.) Length 1 to 2 inches. 

 This species differs from Boleichtkys fusiformis in the naked cheeks.* It is 

 probably a variety of the latter. Upper Missouri River Basin and Red 

 River of the North (spec. Mus. Comp. Zool.). (exilis, slim.) 



BoleicMhys exilis, GIRARD, Proc. Ac. Nat. Sci. Phila., 1859, 103, Little Muddy River, a tribu- 

 tary of the Upper Missouri. Type a little stouter than B. fwriforrrm, the head heavier; 

 scales 53; pores 22. 



BoleichtJiys icarreni, GIRART>, Proc. Ac. Nat. Sci, Phila., 1859, 104, Cannon Ball River. 



Paecilichthys exilis, JORDAN & GILBERT, Synopsis, 521, 1883. 



Pcecitichthys icarreni, JORDAN & GILBERT, Synopsis, 521, 1883. 



Etheostoma exile, BOLLMAN, Bull. U. S. Fish Comm., vm, 1888, 224; BOULENGER, Cat., i, 76. 



480. MICROPERCA, Putnam. 



Microperca, PUTNAM, Bull, i, Mus. Comp. Zool., 4, 1863, ( punctulala). 



This genus differs from Etheostoma in the almost or quite complete 

 absence of the lateral line. The scales are larger than in most of the other 

 darters, the fin rays and vertebrae fewer. Gill membranes considerably 

 connected ; mouth small, the lower jaw ino-luded. The species of Microperca 

 are the smallest in size of the darters, and are plainly colored. They 

 are very closely allied and may all be varieties of Microperca punctulata. 

 , small; TITPKT;, perch.) 



a. Cheeks and ope rcles scaly; anal spines 2; scales 36. PRCELIARIS, 1496. 

 aa. Cheeks and opercles chiefly naked. 



I. Anal spines 2. PUNCTULATA, 1497. 



bb. Anal spine single. FONTICOLA, 1498. 



1496. MICROPERCA PRCELIARIS, Hay. 



Head 4; depth 4$. D. VIII-11; A. II, 6; scales 36. Body short and 

 stout. Snout conical, pointed ; jaws equal ; mouth small, slightly oblique, 

 maxillary reaching front of eye. Eye small, 4 in head. Cheeks and 

 opercles with large scales. Opercular spine well developed. Scales large, 

 the tubes of the lateral line developed on 2 to 4 of them ; dorsals well 



* Specimens of a small darter obtained by Mr. Charles H. Bollman in Clam Lake, Michigan, 

 may belong to this species. These specimens, however, differ materially in the number of dorsal 

 rays. Dorsal VII-10; A. II, 7; lateral line extending to end of anal; scale 55; tubes interrupted, 

 37 to 40; cheeks naked. Bollman, Bull. U. S. Fish Comm., vii, 1888 (1890), l%k. 



