906 CONTRIBUTIONS TO 'NORTH AMERICAN ICHTHYOLOGY IV. 

 Page 385. After Siphostoma punctipinne add: 

 xx. Top of bead with a strong interrupted median crest. (CorythrUhthys Kaup.) 



616 (c). S. y a 1 10 pis J. & G. 



Brownish, with ten broad dark cross-bands which encircle the tail 

 but do not cross the belly anterior to the vent ; snout whitish, with 

 two narrow dark bauds; lower part of head with white cross-streaks. 

 Snout as long as postorbital part of head, keeled above. Head small. 

 Occiput and nape with a strong, compressed crest, on each side of which 

 is a longitudinal ridge; opercle with a median keel. Ridges of body 

 very prominent. Tail one-third longer than rest of body. Dorsal on 

 1 + 4 rings. Dorsal rays 20 ; rings 18 + 30. Head 9. Gulf of Mexico, 

 north to Pensacola. 



(?? Corythrolchthys albirostris Kaup, Lophobranchs, 25: iSyngnathus albirostris Giiu- 

 ther, viii, 170; Jordan & Gilbert, Proc. U. S. Nat. Mus. 1882, 264; Swain, Proc. U. S. 

 Nat. Mus. 1882.) 



Page 386. The identity of C19 (a) with the European H. lieptagomut 

 (antiquorum) is questionable. None of the American examples seen by 

 us are spotted, and their spines are stronger than in European ex- 

 amples. 



aa. Top of head with a slight keel or none; opercle without prominent longitudinal 



ridge. 



c. Dorsal covering 1 + 9 rings ; snout usually long. 



d. Rings 20 to 21 + 45 to 49; dorsal rays 39 to 46; top of head not keeled; 

 large, reaching a length of 18 inches ................. CALIFORNIENSE. 



dd. Rings 18 to 19 + 39 to 42; doVsal rays 36 to 41 ; top of head slightly keeled. 



GRISKOLINEATVM. 

 cc. Dorsal covering 1+7 (rarely 1 +(5) rings. 



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

 short ..................................................... AULISCUS. 



et. Rings 16 to 19 before v.eut. 

 /. Dorsal fin low, not longer than head. 



g. Rings 18 + 31; dorsal rays 34; snout short; body little elongate. 



BAIRDIANUM. 



gg. Rings 17 to 19 + :H5 to 41; dorsal rays 30 to 32; snout moderate or 

 rather short ....................................... LEPTORHYNCUUM. 



ggg. Rings 17 to 18 + 31 to 32; dorsal rays 27; snout rather long; body 

 slender. 



ff. Dorsal fin very high, longer than head, its rays 28 to 32; rings 16 + 30 

 to 33; snout rather short; belly in the female with a black carina; 

 sides of body with narrow vertical silvery streaks in life; doreal 

 spotted ..................................................... AFFINE. 



ooc. Dorsal covering 3 + 5 rings ; rings 20 or 21 + 36 to 38 ; dorsal rays 32 to 37 ; 

 belly ll.it ui -li-hily concave; snout medium ............. LOUISIANA. 



cccc. Dorsal rovt-rin.n I -4- ."> m- ."> -f 4 rings; rings 18 to 20 + 3G to 40 ; dorsal rays 

 36 to 40 j MM H 1 1 in. (! in in ............................. ; ....... FUSCUM. 



