762 Bulletin 47, United States National Museum. 



f. Back transversely concave, the sides of the body also concave; the 



angles very sharp; dorsal rays 40 to 44, the fin on 1 + 8% rings; 



rings about 17 + 41; snout strongly keeled. CARINATUM, 1111. 



/. Back transversely convex, the lateral faces of body flat or convex, the 



angles blunt. 



g. Rings 20 to 21 + 45 or 49; top of head not keeled; snout long; 

 size large; dorsal rays 39 to 46 on 1 + 9 rings. 



CALIFORNIEN8E, 1112. 



gg. Rings 18 or 19 + 39 to 42; snout shorter, slightly keeled; dorsal 

 36 to 41, on 1 + 9 rings. GRISEOLINEATUM, 1113. 



oc. Dorsal covering about 6 or 7 caudal rings, rarely fewer. 

 //. Body rings 16 to 20. 



f. Caudal rings 36 to 41. 



j. Dorsal rays 30 to 32; snout 2 or less in head; head somewhat 



keeled in young. LEPTORHYNCHUM, 1114. 



jj. Dorsal rays 37, on 1 + 7 rings; rings 20 + 41; snout moderate, 



1% in head. FISTULATUM, 1115. 



ii. Caudal rings 31 to 34. 



Ic. Dorsal rays 34; rings 18 + 31; snout short; body stout; tail 



Short. BARBARA, 1116. 



**. Dorsal rays 27 to 31. 



L Snout moderate, \% to 2 in head; dorsal on 2 + 6 rings. 



MACKAYI, 1117. 



II. Snout long, 1% in head; dorsal on 1 + 7 rays, rarely on 

 2 + 6. FLORIDA, 1118. 



iil. Caudal rings 24; body rings 19; dorsal rays 30, on 1 + 6 rings; 

 snout long; body slender. POEYI, 1119. 



hh. Body rings 15; caudal rings 38; dorsal rays 29 to 30; top of head dis- 

 tinctly keeled; snout short. AULISCUS, 1120. 

 eee. Dorsal covering 4 or 5 body rings, 

 m. Dorsal rays 24 to 32. 



n. Dorsal rays 29 to 32, on 1 + 9 rings; rings 17 + 35; snout 2 in 



head; head with keel. PELAGICUM, 1121. 



nn. Dorsal rays 26 to 28, on 1*^ + 5 rings; rings 16 to 34; snout short, 



2 in head; head with slight keel. ROUSSEAU, 1122. 



mn. Dorsal rays 24 or 25, on about 1 + 4 rings; rings usually 16 + 33; 



snout short, 2 in head. ELUCENS,* 1123. 



mm. Dorsal very short, 18 rays, on 1 + 5 rings; rings 17 + 32; snout short. 



JONESI, 1124. 



eeee. Dorsal very short, covering 3 caudal rings, and 1% body rings; its rays 

 20 to 23; rings 17 + 27; snout very short; head keeled above. 



BRACHYCEPHALUM, 1125. 



dd. Dorsal covering 3 body and 4 to 6 caudal rings. 

 o. Kings 16 or 17 + 29 to 32. 



p. Snout rather short, not half length of head; dorsal fin very high; rings 

 18 + 33; dorsal 35, on 5 + 4 rings; belly in female with a black 

 keel; sides with narrow vertical silvery streaks; dorsal spotted. 



AFFINE, 1126. 

 pp. Snout rather long, more than half head. 



q. Rings 18 + 31 to 34; dorsal 30 to 34, on 3 + 5 rings. 



SCOVELLI, 1127. 



qq. Rings 17 + 31; dorsal rays 30, on 3 + 6 rings; head little keeled 



above. BAIRDIANUM, 1128. 



oo. Rings 20 to 21 + 36 to 38; dorsal 32 to 37, on 3 + 5 rings; belly flat or 



slightly concave; snout moderate. LOUISIANA, 1129. 



ooo. Rings 16 to 20 + 36 to 40; dorsal 36 to 40, on 5 + 4 or 4 + 5 rings. 



FUSCUM, 1130. 



1 Including flavirostre, picluratum, linea, marmoreum, and ascendens. 



