Jordan and Evcrmann. — Fishes of North America. 2781 



194. OALEICHTHYS LONGICEPHALUS (Eigemnaun & Eigenmann). 



Head 33; depth 6^. D. I, 7; A. 20. Elongate, sleuder, greatest width 

 little greater than the depth. Head long and depressed, its greatest 

 width 14 in its length, its greatest depth little more than \ its length. 

 Top of head with faint grannies almost entirely concealed hy the skin; 

 interorbital area Hat and with 4 ridges which are ohscnrely grannlar, the 

 inner two bordering the fontanel, the outer ones curved in front extend- 

 ing obliquely backward from near the posterior nasal opening; occipital 

 process as long as broad, its margins concave; fontanel produced as a 

 deep groove to the base of the occipital process; opercle faintly striate; 

 humeral process entirely covered with thick skin, not granular. Eye 

 lateral, well above the angle of the mouth, its diameter 1^ in snout, 6 in 

 head, 3 in interocular; snout depressed and rounded in front. Maxillary 

 barbels extending scarcely beyond base of pectoral, mentals not to gill 

 opening. Upper jaw little iirojectiiig ; width of the mouth 21 in the head ; 

 intermaxillary teeth long and slender, the depth of the band 1^ in its width ; 

 vomerine and palatine tei^th obtusely conical, the vomerine patches sep- 

 arate, contiguous to, but not confluent with, the i)alatino patches. Gill 

 membranes not forming an angle where they meet, with a rather broad, 

 free margin. Ciill rakers short and thick, 4 -f- 5. Pectoral pore small; 

 vertical series of pores present; distance of dorsal fin from tip of snout 

 23 in the length, the spine If in the head, its outer margin granular- toothed 

 near its base, its inner margin with short teeth ; distance of adipose fin from 

 the dorsal 3^ in the length; adiposis fin much longc^r than high, as long as 

 the dorsal fin; caudal forked, the upper lobe ^longer than the lower, very 

 nearly as long as head, 3* in the length ; anal fin emarginate, scarcely 

 longer than high, its height 2|^ in the head; ventrals reaching almost to 

 the anal, .about 2 in head; pectoral spine a little longer than the dorsal 

 spine If in the head; its outer edge roughened, inner edge with rather 

 sharp teeth. Brown above, the sides silvery, entire ventral surface 

 sprinkled with brown dots; a black median line on the back; fins dusky; 

 barbels blackish. One specimen, a male, .29 m. long (No. 4972, M. C. Z.). 

 Panama. .Steiudachner. (Eigenmann iV: Eigeuiuanu, Nematognathi, 82.) 



19.5. (iALEICllTHVS RUGISI'IXIS (Cuvier & Valenciennes) 



Head 3i to 4; depth 5^ to 6. D. I, 7; A. 19 to 21. Slender, compressed 

 on the tail. Head broad and depressed, tapering forward; width of the 

 h^ad 1^ to 1* in its length, at the angle of the mouth 2j to 2i; depth of 

 head If to 2; profile rather steep. Top of head, humeral process, front 

 and sides of spines, and dorsal plate granular, the granulation not extend- 

 ing forward to above middle of cheeks. Occij)ital process triangular, 

 about as long as broad, the median ridge not very prominent. Middle of 

 fontanel behind the eye, the posterior portion separated by a bridge, 

 not continued backward as a groove; interorbital region with 4 ridges. 

 f^ye small, 3 in snout, 10 in head, 3i in the interocular. Barbels ^illiforni. 

 Maxillary barbel reaching to or beyond base of pectoral; postmeutal to 

 gill opening, mental barbels much shorter. Mouth inferior, lower jaw 



