408 



ON THE ESOCES OF MIDDLE NORTH AMERICA. 



End of muzzle to pectoral longer than from pectoral to ventral ; same to orbit less than from orbit to opercular 

 margin; scales between ventrals and pectorals small, 44-50 rows. porosus. 



End of muzzle to pectoral longer than from pectoral to ventral ; same to orbit equal from orbit to opercular 

 margin; scales between ventrals very small, 52-57 rows. 



UMBROSUS. 



Br. R. 14—16. 



Dorsal outline straight; pectoral fin nearer ventral than end of muzzle. D. 18. A. 17. Depth six times to base 

 of caudal. End of muzzle to orbit equal from orbit to opercular border or beyond. reticulatus. 



D. 22. A. 21. Probably, not certainly, in this section. 



DEPRANDUS. 



II. Cheek entirely, operculum half, scaled. 



Dorsal outline horizontal; pectoral nearer end of muzzle than to ventral. B. 14 — 15. D. 19. End of muzzle 

 to orbit equal from orbit to border of operculum. Frontal groove deep. Lucius. 



III. Check and operculum half sealed. 



B. 19. D. 19. No front groove. 



NOBrniOR. 



Esox fasciatus, Dekay, Geol. Surv. N. York. 



E. ornatus, Girard, Pr. Bost. Soc. N. II. Storer, Amer. Acad. Arts, Sci., Tab. xxiv, 

 Fig. 2. 



Besides the characters above pointed out, this species possesses the following : 



Anal radii 4.11—12; scales 12—13 (below dorsal) 92—107 1. 1. 11—13 (above ven- 

 tral). Br. R. 12 — 13. From basis of caudalis to opposite first ray of dorsalis three times 

 to the preoperculum, or a short distance in advance of it. Head three and one-half times 

 to end of caudal fin. Eight rows of scales on the cheek. 



The stout form and large thoracic scales of this species are well indicated in Storer's ex- 

 cellent figure. The colors are very dark, and become bars directed forwards on the infe- 

 rior lateral region. 



Length of adult 10 inches; greatest depth 1.375 inches. 



Five specimens of this species are in the Museum of the Academy, three of them adult, 

 procured in Long Island, N. Y., through the kindness of my friend Thomas Bland, of 

 Brooklyn. They present no variations. 



Esox POROSUS, Cope. 



Esox cyplio, Cope, Proc. Academy Natural Sciences, 1865, 78. 



The additional characters of this species, in which it will be observed it is quite identi- 

 cal with the preceding, are : 



Radii, branchiost. 12 — 13; anal 3.12. Scales 11, 109 — 113, 12. Basis of caudalis to 



