(53) 



70. Fsox luciusL. Pike, Grass Pickerel. (M. V. 266: B.luciusYnr- 

 estor, and E. boreus, Nelson 43. ) 



Very abundant in all large streams in the northern third of the 

 state, its distribution being similar to that of Perca. Rock R., 

 111. R. 



71. Esox salmoneiis Raf. Little Pickerel. (M. Y. 267 ; E. salmoneus 

 and E. umhrosus Nelson 43.) 



Everywhere very abundant in ponds and bayous; especially com- 

 mon in ponds in Union Co.; also specimens from Fox R., and 111. 

 R. at Pekin. 



72. Esox ci/pho Cope. Humpback Pickerel. (M. V. 267 ; Nelson 43.) 



The specimen referred to by Mr. Nelson, from the Fox River at 

 Geneva, is the only one which I have seen from the state. • 



[73. Esox ravenel/i '^Holbr. 



A small, barred pickerel from Union Co., much more slender than sal- 

 moneus, with smaller scales, longer dorsal and anal fins, and different pro- 

 portions generally, is perhaps referable to this species. It measures 2i 

 inches to the caudal. Depth 7* in length, head 3-^, depth of head 10 and 

 width of head 12. Eye 2f in nose (to tip of lower jaw) and 5| in whole 

 head, its depth equal to the deeply grooved inter-orbital space. The mid- 

 dle of the head is at the front margin of the pupil. 



The dorsal commences half its length in front of the anal. The paired 

 fins are very short (V. 3^ in head, P 4i.) The pectorals are nearer ventrals 

 than front of premaxillary, and the ventrals are midway between pectorals 

 and anal. 



Obscure vomerine teeth extend further back than the palatine bands. 



The cheeks and opercles are wholly scaly. Lat. 1. 125 scales, longitud- 

 inal rows 27, from dorsal to anal. D. 14 (complete rays), A. 14, V 10, 

 Br. 14. 



Color in alcohol dusky, with 12 yellowish, nearly vertical bands, plain- 

 est behind, narrow above, but widening below into triangular blotches, 

 which merge in the pale color of the belly. A dark stripe extends from the 

 tip of the nose to the hind edge of the opercle, and a vertical bar downward 

 from the eye. The fins are all dusky. S. A. F.] 



Family AMBLYOPSID^, (the Blind Fishes.) 

 No species of Blind-fish has yet been recorded from Illinois. 



Suborder ISOSPONDYLI. 



Family PERCOPSID^, (the Trout Perches.) 



Genus PERCOPSIS, Agassiz. 



74. Percopsis guttatus Ag. Trout Perch. (M. Y. 270; Nelson 43.) 

 Yery abundant in Lake Michigan, caught by the hundred by 

 boys from the Chicago wharves. Occasionally found in the larger 

 streams through the state. 



