688 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
descending profile; mouth small, oblique, maxillary scarcely reaching vertical from front of pupil, 
barely longer than diameter of lower eye; teeth small, villiform, in a single series in upper jaw and on 
sides of mandible, broadening to an irregular double series or a narrow patch near symphysis; palate 
smooth; vertical from front of upper eye passes through middle of lower eye (in males); interorbital 
width wide and deeply concave; opposing margins of orbits elevated; a strong spine immediately in 
advance of middle of upper eye, and a shorter compressed spine on anterior portion of its lower rim ; 
a similar spine on upper anterior margin of lower orbit, and a slenderer spine near tip of snout; 
symphysis of lower jaw protrudes slightly, but the spine developed on chin in E. grandisquamis is 
wanting in this species; all spines wanting in females, in which also the interorbital space is of scarcely 
appreciable width; in the male, each eye is furnished posteriorly with a conspicuous broad semicircular 
membrane, the free margin of which is posteriorly directed and finely fringed; no trace of this 
membrane exists in females; gill-rakers short and slender, their length about half diameter of pupil, 
12 in number on horizontal limb of outer arch. 
Dorsal fin originating opposite the re-entrant angle nepr tip of snout, the first 3 or 4 rays inserted 
a little to the blind side of ridge, the first ray' provided with a free membranous flap on its anterior 
Fig. 270 . — Engyprosopon xenandrus Gilbert, new species. Type. 
edge, none of the rays elongate or with free tips; ventrals unsymmetrical, that of left or eyed side 
inserted on ventral ridge and having an elongate base beginning at throat, the membrane of last ray 
deflected to the left side of ventral ridge, and not joining first anal ray; anus displaced to the right 
side and lying a little posterior to origin of anal fin; right ventral with a short base, inserted laterally 
and posteriorly with reference to the left ventral. 
Scales on left (eyed) side ctenoid and caducous, on right -side cycloid and more closely adherent; 
cheeks, opercles, interorbital space and snout closely scaled; maxillary and mandible naked; lateral 
line describing anteriorly a high short curve, the chord of which is about twice its height. 
Color in life, grayish on eyed side, with blackish shades and mottlings, with 3 ill-defined black 
spots along middle of sides and a grayish interocular bar bordered with blackish; axil of pectorals black- 
ish; vertical fins more or less speckled; dorsal and anal usually with a subbasal series of dark spots 
alternating with a basal series of pearly spots; a pair of faint dark spots on caudal near its base; pec- 
toral with a dark bar at base, a wider bar near middle of fin, and several ill-defined narrow bars on 
distal half; head and body with many small indistinct yellow spots; posterior half of blind side dusky, 
