292 Field Museum of Natural History — Zoology, Vol. VII. 



Fig. 52. Ciscoe and Blueback Herring of Lake Michigan. 



Argyrosomus huronius Jord. and Ever. (After Evermann and Smith.) 



Color bluish black or greenish above; sides silvery; fins mostly 

 pale, the lower dusky tinged. 



Lakes Huron and Michigan. 



Lake Michigan, Chicago, Illinois; Lake Michigan, Pine and 

 Millers, Indiana. 



Argyrosomus hoyi Gill. Kieye; Chub. 



Head 4.5 to 4.8; depth 4.1 to 4.5; D. 10; A. 11; scales 73 to 80. 



Body robust, little compressed; head pointed; mouth rather 

 large; the jaws about equal; maxillary middle of pupil, 2.6 to 3.0 in 

 head; mandible 2.2 in head; interorbital space 3.6 to 4.3; diameter 

 of eye 4.2 to 4.6; snout 3.4 to 3.8; gill rakers 14 + 25 or 26 on first 

 arch; lateral line complete. 



Color blue on back; sides and ventral surface silvery; dorsal, 

 caudal, and pectoral fins with some dark on their margins. 



Length 13 inches. 



Southern and western Lake Michigan. 



Pine, Indiana; Millers, Indiana. 



Argyrosomus prognathus (H. M. Smith). Longjaw; Bloater. 



Head 4.3; depth 3.5 to 4; D. 9 or 10; A. 10 or 12; scales 75. 



Body robust, moderately compressed; head pointed; mouth 

 large, maxillary reaching pupil, 2.5 in head; mandible 1.7 to 1.8 in 

 head; lower jaw projecting beyond the upper; interorbital space 6.8 

 in head; diameter of eye 5; snout 6.8; gill rakers slender, about 

 15+28 on first gill arch; lateral hne complete. 



Color dusky above, the sides silvery; dorsal and caudal fins usually 

 with dark edge. 



Length 15 inches. 



Deep water of Lakes Ontario, Huron and Michigan. 



