Fishes of the IFestern North Atlantic 



313 



Figure 76. Pomolobus heads, showing shape of mandible and cheek, a, chrysoch/oris, 54 mm TL, USNM 9424; 

 B, mediocris, 122 mm TL (after Hildebrand and Schroeder); c, aestivalis, 45 mm TL, USNM 69834; 

 D, pseudoharengus, 48 mm TL, USNM 69833. a drawn by Ann S. Green, b by Louise Nash, c, d by Nancy 

 D. Patton. 



Range. Three species occur in the Atlantic, from Nova Scotia to northern Florida, 

 and one occurs in the Gulf of Mexico and tributary streams as far west as Corpus 

 Christi, Texas, ranging northward to Minnesota (see Key). 



Key to Species 



Lower jaw strongly projecting, extending nearly or quite into dorsal outline of 

 head (Fig. 76 a, b); only 18—24 gill rakers on lower limb of first arch, not increas- 

 ing in number with age. 



2 a. Greatest depth of body usually less than length of head, 3.5-4.1 (usually 

 3.8-4.0) in SL; teeth present in jaws at all ages, those in lower jaw prominent; 

 bluish green color of back ceasing abruptly, not blending into the silvery 

 color of side; no spot at shoulder. chrysochloris Rafinesque 1820, p. 315. 



