208 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



clecurved. Mouth terminal, small, oblique, tlie maxillary barely reach- 

 ing vertical from front to orbit, equaling length of snout, which is 4 in 

 head. Eye large, very slightly longer than iuterorbital width, 3 in head. 

 Teeth (in the three specimens examined) uniformly 2-4-4-2, with strong 

 groove-like grinding surface, the sharp edges of the grooves finely den- 

 ticulated on three of the teeth. 



Veutrals inserted under second or third ray of dorsal, the origin of 

 which is iBonstantly slightly nearer snout than base of middle caudal 

 rays. Longest dorsal ray about 4 length of head, twice the length of 

 the base of the fin, and three times the length of the last ray. Caudal 

 longer than head. Pectorals not nearly reaching ventrals, the latter 

 about to vent. 



Scales not crowded, the exposed surface little higher than long, 13 in 

 front of dorsal fin. Lateral line, complete, very little decurved ante- 

 riorly where it runs along the lower edge of the dark lateral stripe. 



Head 4 in length ; depth, 4§ ; D. 8 ; A. 7 ; L. lat., 37. 



Head dusky above ; back with outlines of scales rendered conspicuous 

 with dusky specks ; a faint dark vertebral line, usually double in front 

 of dorsal, single behind. Sides and below light, with some silvery lus- 

 ter, but the sides without distinct silvery streak ; a dusky streak along- 

 middle of sides ends in a black spot at base of caudal, and extends an- 

 teriorly across opercles and around snout. This streak is composed of 

 minute black dots, some of which are clustered around the pores of the 

 lateral line rendering these very conspicuous. A series of specks along 

 base of anal, continued as a double series along lower edge of caudal 

 peduncle to tail. Fins unmarked. 



Three specimens, each about two inches long. 



7. Notemigonus chrysoleucus Mitcb. 



Abundant. 



Maxillary equaling diameter of eye, 4 in head. A. 13. Lateral line 50. 



8. Zygonectes dispar Agassiz. 



Found occurring in myriads everywhere in the shallow waters of 

 the swamp. The diflerences in coloration of males and females were 

 sharply marked. The largest specimens seen were about two inches 

 long. There is a small dark blotch in front of upper rim of orbit, not 

 extending much beyond nostrils; the dark blotch below eye is very 

 conspicuous, and covers nearly all of cheek. 



This species had previously been taken in Central and Southern Illi- 

 nois, and in Northern Indiana. 



9. Esox vermiculatus Le Sueur. 



Very abundant. Coming from the swamp, these si:)ecimens are very 

 dark, the dark markings on back and upper jiart of sides confluent, 

 these regions uniform greenish black. A narrow black streak back- 

 ward from eye, as well as that leading forward, and the conspicuous 



