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. n; 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 line 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. 



