NOMENCLATURE AND MORPHOLOGY. 19 



SPECIFIC DESCRIPTIONS. 



MICROPTERUS SALMOIDES Nelson, 1876. " Like the preced- 

 ing [Ml nigricans], found iu all parts of the state, and in nearly 

 equal numbers." (NELSON, Partial Cat. Fishes Ills. <^Butt. 

 His. State Lab. Nat. Hist., i, 37, 1876.) 



MICROPTERUS SALMOIDES Cope, 1881. ---" Small-mouthed; 

 scales of trunk small (e. g., lat. line, 72-75; between lateral line 

 and back, 11 rows). Scales on nape and breast much smaller 

 than those of sides. Scales of cheeks minute (e. g., between or- 

 bit and preoperculum, about 17 rows in an oblique line and 

 about 9 in a horizontal one). Scales of interoperculum uiiise- 

 rial, covering only about half the width of the bone. Scales of 

 preopercular limb none. Scales on dorsal developed as a deep 

 sheath (involving last spine) of small scales differentiated from 

 those on the back, and with series advancing high up the mem- 

 brane behind each ray (except last two or three). Scales on anal 

 ascending high behind each ray. Mouth moderate. Supramax- 

 illary ending considerably in front of hinder margin of orbit 

 (about under hinder border of pupil). Dorsal rays articulated, 

 13; anal, III, 10-11; pectoral, I, 16-1, 17. Dorsal tin little 

 depressed, the ninth spine being only about a half shorter than 

 the longest (3, 4, 5), and a fourth shorter than the tenth." 

 (COPE, Fishes of Pa. <Rept. Pa. Fish Cam., 130, 1881.) 



MICROPTERUS DOLOMIEU Jordan and Gilbert, 1882. " Body 

 ovate- fusiform, becoming deeper with age, Head large. Mouth 

 large, but smaller than in M. salmoides, the maxillary ending con- 

 siderably in front of the hinder margin of the orbit. Scales on 

 the cheek minute, in about 17 rows ; scales on the trunk compar- 

 atively small. Dorsal fin deeply notched, but less so than in M. 

 salmoides, the ninth spine being about half as long as the longest, 

 and not much shorter than the tenth. Coloration quite variable, 

 the young dull golden-green, with bronze luster ; darker spots 

 along the sides, which tend to form short vertical bars, but never 



