SOUTH AMERICAN NEMATOGNATHI. 49 



8. Bunocephalus scabriceps sp. uov. 



T3'pes, No. 7967; two specimens .04-. 043 in. Jutahy. James, Thayer 

 & Talisman, 



This species may readily be recognized by its prominent 

 cephalic knobs. 



Tail slender, tapering. Head and body deep, the depth 

 at base of occipital process scarcely less than the distance 

 from tip of snout to base of pectoral. Nuchal plate a thin 

 crest with two high knobs and a knob at its base; a trans- 

 verse crest at base of nuchal plate directed backward 

 externally; a low crest between the eyes, two crests extend- 

 ing backward from eyes, becoming approximated behind and 

 forming a lyre -shaped figure; each arm of the lyre with 

 three knobs; a crest extending forward from the eye, meet- 

 ing its fellow at the tip of the snout. 



Interorbital width equals the snout plus the eye; eye 

 almost lateral. 



Maxillary barbels reaching about to base of pectoral fins; 

 mental barbels not reaching post mentals; post mentals less 

 than interorbital width. 



Teeth villiform in two narrow patches in each jaw. 



Coracoid process converging backward, the margins of 

 the coracoid bone marked by prominent ridges, which with 

 the processes form a lyriform figure; the length of the pro- 

 cesses about equal to the space between them. Humeral 

 process extending to about the middle of the pectoral 

 spine. 



Pectoral pore large, slit -like. Skin everywhere covered 

 with small warts. 



Distance of dorsal fin from tip of snout 2^ in the length. 

 Pectoral spine reaching tip of coracoid process, both mar- 

 gins Avith strong hooks, strongest toward tip. 



Back mottled with light and dark brown; belly more 

 uniform brown, marked with lighter. 



A. 6 : Greatest width in front of the pectoral fin 3 in the 

 length. 



2d See,, Vol. II. [4 ] Lssued August 18, 1889, 



