120 OSTARIOPHYSI. 
1. Vomerine patches of teeth continuous with the larger club-shaped palatine patches ; 
maxillary barbel extending to operculum or nearly to base of pectoral. 
Width of mouth slightly more than 4 the width ofhead. . . . . . «© . 6. assimilis. 
Width of mouth nearly 2 the width of head. . 2. 6 1 ee ee ee Ze guatemalensis. 
2. Vomerine patches of teeth oblong or oval, continuous or subcon- 
tinuous with the palatine patches, which are only a little larger 
than the vomerine ones and of similar form; maxillary barbel 
extending beyond the base of pectoral. . . . « . «© « « . 8. caerulescens. 
B. Fontanel produced backwards into a feeble groove which does not 
reach the parieto-occipital ; occipital process twice as long as broad ; 
inner edge of pectoral spine weakly serrated; anal of 21 or 22 rays. 9. lentiginosus. 
C. Fontanel produced backwards into a groove which nearly or quite reaches the parieto- 
occipital; inner edge of pectoral spine weakly or moderately serrated; anal fin of 14 
to 20 rays. 
1. Occipital process subtriangular, much broader than long; 9 to 12 gill-rakers on the 
lower part of the anterior arch; adipose fin shorter than the dorsal. 
Occipital process rounded posteriorly ; premaxillary band of teeth 43 times 
aslongas broad 2. 1 ew eee ee ee ee ee ee ee 10. quentheri. 
Occipital process with straight sides and truncate apex ; preemaxillary band of 
teeth 5 to 6 times as long as broad «ww we ee ee ee ee LL Seemani. 
2. Occipital process as long as broad ; 6 gill-rakers on the lower part of 
the anterior arch ; adipose fin a little longer than the dorsal . . 12. longicephalus. 
8. Occipital process 3 times as long as broad; 10 gill-rakers on the 
lower part of the anterior arch ; adipose fin as long as the dorsal . 13. peruvianus. 
1. Galeichthys dovii. 
Leptarius dowi, Gill, Proc. Ac. Philad. 1863, p. 170°. 
Arius alatus, Steind. Sitzungsb. Ak. Wien, Ixxii, 1876, p. 569, t. 6°. 
Selenaspis dowi, Jord. & Everm, Bull, U.S. Nat. Mus. xlvii. 1900, p. 2761°. 
Hab. Pacific Coast from Panama to Ecuador : 
Panama!2?; Ecuador ?®. 
This is the Pacific representative of G. herzbergii, Bl., from Guiana and Brazil. 
2. Galeichthys troscheli. 
Sciades troscheli, Gill, Proc. Ac. Philad. 1863, p. 171°. 
Arius troscheli, Giinth. Cat. Fish. v. p. 150 (1864) ”. 
Arius brandtii, Steind. Sitzungsb. Ak. Wien, Ixxii. 1876, p. 571, t. 3°. 
Sciedichthys troscheli, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1909, p. 2757". 
Depth of body 5 in the length, length of head 33. Breadth of head 1% to 11 in its length, diameter of eye 
7 to 84. Fontanel not produced backwards into a distinct groove ; occipital process with a weak keel, 
broader than long, the sides straight, the posterior edge emarginate; dorsal shield sub-pentagonal, 
emarginate posteriorly, about as broad as long, its length in the median line 1 to + of the distance from 
tip of snout to origin of dorsal fin. Width of mouth 3 to 3 the width of head; premaxillary band of 
