NOMENCLATURE AND MORPHOLOGY. 25 



Perhaps some of the names recently given to the Mexican forms 

 may be applicable to a variety so defined. The Llano [Texas] 

 fish is rather light colored ; and there is a dusky- line along the 

 middle of each row of scales, which are especially distinct below 

 the lateral line." (CoFE, Bull. U. S. Nat. Mus., xvii, 32, 

 1881.) 



MICROPTERUS PALLIDUS Cope, 1881. "Large mouthed. 

 Scales of trunk moderate (e. g. , lot. line, 65-70 ; between lateral 

 line and back, 7J or 8 rows). Scales on nape and breast scarcely 

 (on nape), or not .much (on breast), smaller than those of sides. 

 Scales of cheeks moderately small (e. g., between orbit and pre- 

 operculum, about ten rows in an oblique line and about 5-6 in 

 a horizontal one). Scales of interoperculum uniserial, covering 

 the entire width of the bone. Scales of preopercular limb de- 

 veloped in an imperfect row (e. g., 3-5 in number). Scales on 

 dorsal developed as a low (obsolete) shallow sheath, and with 

 series ascending comparatively little on membrane behind the 

 rays (none behind last five or six). Scales on anal none (or 

 very few). Mouth large. Supramaxillary extending consid- 

 erably behind the posterior margin of orbit. Dorsal rays ar- 

 ticulated, 12 (I, 11) ; anal, III, 10 ; pectoral, I, 14 (1, 14). 

 Dorsal fin much compressed [depressed ?], the ninth spine being 

 only about a fourth as long as the longest, and half as long as 

 the tenth." (COPE, Fishes of Pa. <^Rept. Pa. Fish Com., 131, 

 1881.) 



MICROPTERUS SALMOIDES Jordan and Gilbert, 1882. " Body 

 ovate-fusiform, becoming deeper with age, moderately com- 

 pressed. Head large. Mouth very wide, the maxillary in the 

 adult reaching beyond the eye ; in the young shorter. Scales on 

 the cheek in about 10 rows ; scales on the trunk comparatively 

 large. Lingual teeth sometimes present. Dorsal fin very deeply 

 notched. Coloration of the young dark-green above ; sides and 

 below greenish-silvery; a blackish stripe along the sides from 

 3 



