FISH OF ONTARIO. 93 



off, leaving a naked strip ; head depressed, rather pointed, the mouth being 

 small and inferior, overlapped by a tapering, subtruncate, piglike snout; 

 upper jaw not protractile, maxillary small, exposed ; teeth on vomer and 

 palatines; gill membranes scarcely connected; dorsal fin well separated, 

 the first the larger, of thirteen to fifteen spines, the second dorsal rather 

 longer than the anal, which has two spines, the first of which is usually the 

 shorter ; pectorals symmetric, rounded or bluntly pointed, their rays four- 

 teen or fifteen, their spines moderate; ventral fins well separated, the inter- 

 space about equal to their base ; air bladder and pseudobranchiae present, 

 rudimentary. 



(97) Log Perch. 



(Percina caprodes.) 



Body long, slightly compressed; head long, with pointed snout, 

 mouth small ; the lower jaw not reaching near to tip of snout, and the 

 maxilla not extending to the front of the eye. Scales on cheeks and gill 

 covers, also on the space before the first dorsal ; breast scaleless. A row 

 of enlarged plates on the belly, which are sometimes deciduous. Fins 

 moderately low and rather long. 



D. XV., 15; A. II., 9. Scales in lateral line, 92. 



Colour, greenish yellow, with about fifteen dark cross bands, extend- 

 ing from back to belly ; alternating with those above the lateral line are 

 fainter bars. Fins barred. A black spot at the base of the caudal. 



This is the largest of the Darters, reaching a length of about eight 

 inches. It is found throughout the Great Lake region in clear, rapid 

 streams having a gravelly or rocky bottom. The variety next mentioned 

 is probably the common form of Ontario. 



(98) Manitou Darter. 



(Percina caprodes zebra.) 



Similar to the last, but nape always naked ; lateral black bars short, 

 not extending much above lateral line, these also more or less confluent, 

 about twenty in number ; a black caudal spot ; dorsal and caudal mottled. 



D. XV., 14; A. II., 10. Scales, 90. 



This variety of P, caprodes is found in the rapid streams of the Great 

 Lake region, and more particularly those falling into Lake Superior. 



GENUS HADROPTERUS. (BLACK-SIDED DARTEKS.) 



Body rather elongate, compressed or not ; mouth rather wide, terr 

 minal, the lower jaw included ; the snout above not protruding beyond the 

 premaxillaries, which are not protractile; teeth on vomer and usually on 

 palatines also ; gill membranes separate or more or less connected ; scales 

 small, ctenoid, covering the body; b^lly with a median series of more or 



