220 FISHES. 



seasons; neck above scaly; D. XIII — 12; A. II, 10. 

 Great Lakes and Western Streams, abundant, E. to L. 

 Champlain; the largest of the Darters, reaching a length 

 of six or eight inches. (P. zebrct^ semifasciata^ 7iebulosa^ 

 and bbnaculata of authors.) 



2. P. manitou, Jordan. Manitou Darter. Head 

 notably shorter and broader than in P. ccqyrodesj mouth 

 smaller and less inferior; fins larger; lateral bars shorter 

 and more blotch like, not meeting their fellows across 

 the back; space in front of dorsal fin entirely naked; 

 D. XV— 14; A. II, 10. Indiana (Lake Manitou) to 

 Wisconsin. 



4. ALVORDIUS, Girard. Black -sided Darters. 

 {^Etheostoma^ Agassiz — not of Raf.) 



1. A. aspro. Cope & Jor. Black -sided Darter. 

 Blenny Darter. Head long, pointed, 4 in length; depth 

 5 to 5|-; belly with a series of caducous plates along the 

 middle line (shed at some seasons.) Straw yellow, with 

 dark tesselations and about seven large blotches along the 

 sides, partly confluent, thus forming a moniliform band; 

 D. XIII, to XV- 12; A. II, 9. Ohio Valley, Great Lakes 

 and eastward; one of the most curious and elegant of 

 all the Darters. {A. aspro, Cope & Jor. ? Alvordius 

 and Hadropterxis maculatus, Grd. Etheostoma hlen- 

 nioides, Ag-) 



2. A. variatus, (Kirt.) Jor. Shielded Darter. 

 Head shorter; sides with broad, brownish shades; 

 ventral shields much larger; D. XII — 13; A. II, 9; lat. 

 1.53. Penn. (^. pe^^rt2^?/m, Stauff.) 



3. A. macrocephalus, Cope. Loxg-headed Darter. 

 Head much elongated, 3^ in length, the snout much 

 longer than the eye; cheeks and opercles naked; colora- 



