ETHEOSTOMATIDiE. — LXXXIX 219 



II. Lateral line curved upward over the pectorals. 

 n. Jaws about equal ; body elongated. . Boleichthys, 16. 



kk. Lateral line incomplete ; anal spine feeble. (See Addenda, 

 p. 405.) Vaillantia. 



kkk. No lateral line ; dorsal fins small, subequal, well separated ; 

 mouth small, with nearly equal jaws; scales large; size 

 smallest of all spiny-rayed fishes. . Microperca, 17. 



/. AMMQCRYPTA, Jordan. Sand-divers. 



1. A. beanii, Jordan. Bean's Darter. Body very- 

 slender; general form and appearance of Pleurolepisj 

 dorsal fins very high ; color translucent, with a golden 

 lateral band; dorsal fin with large black spots; D. X — 

 10; A. I, 9; lat. 1. G5. Lower Mississippi; a remarkable 

 species. 



2. PLEUROLEPIS, Agassiz. Pellucid Darters. 

 1. P. pel lucid us, (Baird.) Ag. Sand Darter. Depth 6 

 to 8 in length; body nearly cylindrical; head elongated, 

 pointed; scales small, finely dotted, far apart, and deeply 

 imbedded; fins small; color piiikisli white, pellucid in 

 life, with a series of small, squarish, olive (blue) blotches 

 along back, and another along sides, the spots connected 

 by a gilt line; D. X — 9; A. I, 6; length 2 to 3 inches. 

 Ohio Valley, in sandy streams; one of the most interest- 

 ing of our fishes. 



3. PERCINA, Haldeman. Log Perches. 

 ^^Pileoma. DeKav. 

 1. P. caprodes, (Raf.) Girard. Log Perch. Hog Fish. 

 Rock Fish. Salmon yellow or greenish, with about 

 fifteen transverse dark bands from back to belly, these 

 usually alternatino; with shorter and fainter ones reach- 

 ing about to lateral line; a black spot at base of caudal; 

 belly with a row of enlarged plates, shed at some 



