25 FISHES OF SINALOA. 397 



much produced backward, less than half length of pec- 

 toral spine, its surface not granular, covered by skin. 

 Adipose fin half length of anal, its posterior margin little 

 free. Upper lobe of caudal longest and somewhat fal- 

 cate, about as long as head. Ventrals unusually long 

 about reaching anal in females, shorter in the males. Vent 

 much nearer base of ventrals than anal. 



Color olive green, with bluish luster, white below ; upper 

 fins dusky olivaceous ; caudal yellowish dusky at tip : 

 anal yellowish with a median dusky shade; ventral yel- 

 lowish, the basal half of the upper side abruptly black; 

 pectorals similarly colored, the black area rather smaller; 

 maxillary barbel blackish: other barbels pale. 

 Length, 12 to 18 inches. 



The following specimens from Dr. Gilbert's Mazatlan 

 collections are registered in the United States National 

 Museum : 



28,161, 28,189, 28,210, 28,213 (2), 28,221, 28,232, 

 28,276, 28,304. 



This species is nearest allied to Galeichthys seemanni 

 (Giinther), a Panama species. Galeichthys jordani 

 (Eigenmann) from Panama differs in the gill rakers and 

 in other regards. Galeichthys assimilis is an Atlantic 

 species, not yet known from the Pacific Coast. With 

 each of these Galeichthys gilbcrti has been at one time or 

 another confounded. Galeichthys gilberti differs from 

 Galeichthys seemanni, as described by Dr. Eigenmann, in 

 the absence of pectoral pore, in the shorter spines and in 

 the fontanelle not quite reaching occipital process ; ven- 

 trals unusually long, no dark specks on side of belly, 

 barbel short, compressed. As noted below, Galeichthys 

 gilberti bears a superficial resemblance to Netuma fllaty- 

 ,-pogon. Its teeth are different, the ventrals are much 

 longer, and the adipose dorsal much larger. Netuma 



