Jordan and Evcrtnann. — Fishes of N'orth America. 1103 



Pcecitich/lnjs gracilis, Jordan & Gilbert, Synopsis, 521, 1883. 



Elheostoniu /usifoi-nie, EvERMANN & Kendall, Bull. U. S. Fish Coiiim., .\ii, 1892 (1894), 11,5; Bou- 

 LENUER, Cat., 1, 75; and of authors generally. 



1495. BOLEICHTHYS EXILIS, Girard. 



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

 compressed, tapering toward the caudal peduncle, whicii i.s slightly con- 

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

 dorsal than the ahdorainal 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 BoJeichthijs fnsiformis 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.) 



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

 tary of the Upper Missouri. Type a little stouter than 11. fnsifunins, the head heavier; 

 scales 53; pores 22. 



Boleichlhi/s warreni, Girard, Proc. Ac. Nat. Sci, Phila., 1859, 104, Cannon Ball River. 



FiTcilichthys cxilis, Jordan k Gilbert, Synopsis, 521, 1883. 



Pifcilichthys warreni, Jordan & Gilbert, Synopsis, 521, 1883. 



Etheosloma exile, Bollman, Bull. U. S. Fish Comm., viii, 1888, 221; Bovlenger, Cat., i, 76. 



480, MICROPERCA, Putnam. 



Micro2)erca, Putnam, Bull, i, Mus. Comp. Zoiil., 4, 1863, {punctulala). 



This genus differs from Etheoatoma 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 vertebrse fewer. Gill membranes considerably 

 connected ; mouth small, the lower jaw included. The species oi Mkroperca 

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

 are very closely allied and may all be varieties of Micropcrca punclulata. 

 {liLKpoQ, small; iripKi/, perch.) 



a. Cheeks and opercles scaly ; anal spines 2; scales 36. proiliaris, 1496. 

 aa. Cheeks and opercles chiefly naked. 



(). Anal spines 2. • punctulata, 1497. 



hb. Anal spine single. fokticola, 1498. 



1496. MICROPERCA PRiELIARIS, Hay. 



Head 4; depth 41. D. VIII-11; A. II, 6; scales 36. Body short and 

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

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

 opercles with large scales. Opercular spine well develoi)ed. Scales large, 

 the tubes of the lateral line develoi)ed on 2 to 4 of them ; dorsals well 



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

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

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

 37 to 40; cheeks n&ked.— Bollman, Bull. U. S. l\sh Comm., vii, ISSH (ISUO), UU. 



