308 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



aa. Top of head -with a slight carination, or with none; opercle without prominent 

 longitudinal ridge. (Sijyhostomu.) 

 c. Dorsal fin covering 1+9 rings: snout usually long. 

 d. Rings 20 to -21+45 to 49; D. 39 to 46; top of head without ke^^d; large, reach- 

 ing a length of 18 inches Califorxiense, 3. 



dd. Rings 18 to 19+39 to 42: D. 36-41; top of head slightly keeled. 



Griseolixeatum, 4. 

 cc. Dorsal fin covering 1+7 (sometimes 1+6; rings. 



e. Rings 15+38; D. 29 to 30; top of head distinctly keeled; snout short. 



AULISCUS, 5. 

 ee. Rings 16 to 19 before vent. 

 /. Dorsal fin low, not longer than head. 



, g. Rings 18+31 ; D. 34 ; snout short : body comparatively stout; tail short. 



Bairdianum, 6. 

 gg. Rings 17 to 19+.36 to 41: D. 30 to 32: snout moderate, or rather 



short ; l)ody slender Leptorhyxchum, 7. 



ggg. Rings 17 to 18+31 to 32; D. 27; snout rather long Florid.e,8. 



f. Dorsal fin very high, not shorter than head; rings 16+30 to 33; D. 28 to 



32 ; belly in female with black carina ; snout rather short ; sides of Ijody 



with narrow vertical silvery streaks in life; dorsal spotted.. Ai-fixe, 9. 



ccc. Dorsal fin covering 3+5 rings; rings 20 to 21+36 to 38; D. 32 to 37 ; belly fiat 



or slightly concave ; snout moderate Louisia^m;, 10. 



cccc. Dorsal fin covering 5+4 or 4+5 rings; rings 18 to 20+36 to 40; D. 36 to 40: 

 snout moderate Fuscu.m, 11. 



1. Siphostoma zatropis J. cV G. 



'.'.Corythoichthiis albirostris Kaup, Lophobr. p. 25 (Bahia, Mexico). 

 Sijngnathus aJbirostrifi GiiutheT, Cat. Fish. Brit. Mus. viii, 170, 1870 (Mexico). 

 Si2)hostoma zatropis J. & G. Proc. U. S. Nat. Mus. 1882 (Pensacola). 



Head D in total length; D. 23; rings 18+30. 



Body robust. Snout short, 2f in head; a strong median ridge above 

 on snout, two ridges below with a median groove, and on each side of 

 the groove is a horizontal ridge running to lower part of orbit. Occiput 

 and nuchal plates very sharply carinated; opercle with two horizontal 

 ridges. Belly somewhat concave, little keeled. Dorsal much shorter 

 than head, covering 1 + 4 rings. Caudal well developed, 1^ in base of 

 dorsal. Tail longer than rest of body, If in total length. 



Color in spirits light olivaceous, with about twelve irregular brown 

 cross bauds, each covering from two to three rings; snout light, with 

 two or three narrow cross-bands below; rest of head dusky. 



Habitat. — Atlantic coast of America, Pensacola; Mexico. 



Described from the original type, a specimen, og inches in length, 

 obtained by Prof. D. S. Jordan from the "Snapper Banks," near Pensa- 

 cola, Fla. 



2. Siphostoma punctipinne (Gill) J. A: G. 



Dtrmatosietlnis putictipiiuiis Gill, Proc. Acad. Nat. Sci. Phila. 1862, 283 (San 



Diego, Cal.). 

 Siphostoma imnctipinnt J. & G. Proc. T'. S. Nat. Mus. 1^80, 353, (name only). 



J. & G. Proc. U. S. Nat. Mus. 1881, G9: J. & G. Synopsis Fishes Nortli 



America, 385, 1882. 



Head 8 in total length ; D. 41 ; rings 19+30: length VI inches. 



