PERCID^. — Lxm. 123 



From Ind. W. and S. occurs var. clamm (Jordan & Meek). 

 Differs from yax.pellucidum in having no scales along nuchal region, 

 and none on sides anteriorly except the 5 or 6 rows along lateral 

 line. Cheeks with few scales. 



From S. 111., S., and W. is found var. vivax (Hay), better scaled 

 than var. pellucidum, the region before dorsal being more or less 

 closely covered with scales ; scales firmer and rougher ; a dusky 

 bar across base of soft dorsal. 



cc. Anal spines two; anal small. (loa^ Jordan & Brayton.) 



323. E. vitreum (Cope). Side of head closely covered with 

 large, rough-ctenoid scales ; middle and lower part of side with 

 rough scales, breast and part of belly naked as is front of back ; 

 fins low ; P. long. Translucent, with small dark spots on back and 

 sides; fins plain. Head 4^; depth 7. D. VII to IX -11 to 13. 

 A. II, 7. Scales 60. L. 2. Va. and N. C, common in Neuse R. 

 (Lat., glassy.) 



hb. Premaxillaries not protractile; dorsal spines 14; anal fin large. (Crys- 

 tallaria2 Jordan & Gilbert.) 



324. E. asprellus (Jordan). Eyes very large ; mouth moderate ; 

 cheeks and opercles well scaled ; nape scaly ; throat and belly 

 naked; fins large; C. lunate; hyaline olive; sides with 10 dark 

 quadrate blotches, small and far apart ; body sometimes with 4 or 5 

 broad dark cross-bands ; fins plain ; a dusky shade through eye. 

 Head 41 ; depth 7. D. XIV-13. A.I, 12. Scales 7-93 - X. L. 4. 

 S. Ind. (Rising Sun ; O. P. Jenkins) to 111., Ala., and Ark., in clear 

 water, much the largest of the hyaline or " sand " Darters, approach- 

 ing the type of E. aspro. (Diminutive of Aspro.) 



aa. Body less elongate, not hyaline, almost entirely covered with scales, 

 e. Premaxillaries protractile. 

 f. Anal spine single, obscure; dorsal spines usually 9 ; anal smaller than 

 soft dorsal. 

 g. Lateral line complete or very nearly so. (BoleosomaS DeKay.) 

 h. Soft dorsal with 12 to 14 rays. 



i. Cheeks and opercles scaly; D. IX -14. 



325. E. olmstedi Storer. Body rather slender; fins very high; 

 the spines weak ; nape and breast usually naked (closely scaled in 

 var. atromaculatum Girard, Cayuga L. and S.) ; olivaceous; sides 

 with blotches and zigzag markings ; fins speckled ; head black in 

 males in spring. Head 4 ; depth 5^. A. I, 9. Lat. 1. 50. L. 3i. 

 Mass. to W. N. Y., S. to Ga., abundant ; probably a variety of the 

 next. (To ]Mr. Olmsted who discovered the species in the Conn. 

 Valley.) 



ii. Cheeks almost always naked ; opercles scaly ; breast naked. 



1 uk, arrow. ' KpuoraAAo;, crystaL ' /SoAcs, dart ; awfta, body. 



