PERCID.E. LXIIL 127 



sides with 9 blackish oblong spots, alternating with smaller ones ; 

 fins mottled; 1st D. with median dark band. Head 3; depth 

 7. D. XV- 13. A. II, 11. Scales 11-77-15. L. 3. Ohio Valley, 

 rare W. (pciKpos, large ; jce^aAiJ, head.) 



tt. Cheeks naked; opercles scaly above only; nape and breast naked-, 

 muzzle blunt. 



339. E. peltatum Stauffer. Body rather stout ; mouth moderate, 

 maxillary reaching eye ; ventral shields large. Olive, the back with 

 short cross-bars ; sides with broad brownish shades ; a dark blotch 

 on neck and opercle ; snout and space below eye with the usual 

 bars ; fins barred ; 1st D. with a black band. Head 4 ; depth 5. 



D. XII, 12. A. II, 8. Scales 7-53-9. L. 4. Penn. to S. C., 



E. of Mts. (E. nevisense Cope; Alv. crassus Jor. & Brayton.) 

 (Lat., having shields.) 



tit. Cheeks usually with small scales ; opercles with 'larger ones. 

 u. Head not very slender, the muzzle moderate, the lower jaw in- 

 cluded. 



340. E. aspro (Cope & Jordan). BLACK-SIDED DARTER. 

 Body fusiform, rather elongate ; maxillary reaching just past front 

 of eye; breast naked; nape scaly or not. Greenish yellow with 

 dark tessellations and marblings above and about 7 large dark 

 blotches along side, more or less confluent; fins barred; a small 

 spot at base C. Head 4 ; depth 6. D. XIII to XV, 12. A. II, 9. 

 Scales 9-65-17. Vert. 42. L. 3 to 4. W. Penn. to Dakota and 

 Ark., abundant, one of the most elegant of the darters. (Aspro, a 

 related genus of European Percidce, from Lat. asper, rough.) 



uu. Head very slender, with long-acuminate snout; jaws subequal. 



341. E. phoxocephalum Nelson. Body slender; mouth large, 

 maxillary reaching eye ; nape scaly ; breast naked. Yellowish 

 brown, the lateral spots smaller than in E. aspro and more numer- 

 ous, quadrate in form ; a small dark spot at each end of lateral line. 

 Head 4; depth 5. D. XII- 13. A. II. 9. Scales 12-68-14. 

 Vert. 39. L. 4. Ind. to Kans. and Ark., common S. W. ($oos, 

 tapering ; Kc<pa\r), head.) 



qq. Preopercle more or less distinctly serrate, especially in the young; 

 gill membranes broadly united. (Serraria 1 Gilbert.) 



342. E. scierum (Swain). Body rather stout; head short, 

 bluntish ; mouth small, the lower jaw shorter ; maxillary not reach- 

 ing eye ; cheeks and opercles scaly ; breast partly scaled ; scales of 

 median line of belly slightly enlarged, probably deciduous ; fins very 

 large. Yellowish olive, everywhere vaguely blotched with black, 

 especially along sides ; with head and most fins blackish ; 9 

 paler. Head 4 ; depth 5. D. XIII, 14. A. II, 9. Scales 7-C5-11. 



1 Lat., serra, saw. 



