524 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
dorsal and anal fins small and short; ventrals well developed; pectoral fins well developed, the base 
strongly angled, with long pseudobrachia and 3 aetinosts. Branchiostegals 5, no pseudobranchise. 
a. Disk with the frontal region elevated, and the snout more or less produced forward; the tail stout; orbits lateral , teeth 
. on vomer and palatines; rostral tentacle present. Malthopsis, p. 524 
act. Disk with the frontal region depressed, not elevated above the rest; eyes partly superior; snout rounded, obtuse in 
front; tail slender. 
c. Disk subcircular; gills 2p mouth rather large, subvertical; prickles rather strong. llalieutiea, p. 525 
cc. Disk subtriangular; gills 2; prickles very strong. Dibvanchus, p. 525 
Genus 267. MALTHOPSIS Alcock. 
Resembling Ogcocephalus, but having only 2 gills on each side instead of 2.5. (Goode & Bean.) 
Malthopsis Alcock, Ann. & Mag. Nat. Hist. 1891,26 (luteus). 
439. Malthopsis mitriger Gilbert A Cramer. Fig. 229. 
Branchiostegals 4; D. I, 4 or 5; A. 4; P. 14; V. I, 5; pores of lateral line behind disk 9. 
Disk strongly depressed, triangular, its greatest width (exclusive of the posterior lateral projec¬ 
tions) 1.66 in length of body exclusive of caudal, its depth about 4; body behind disk tapering nearly 
uniformly; body nearly everywhere covered with radially striated tubercular plates; gular region and 
W.vA-ti' ~ 
* -- 
Fig. 229. — Malthopsis mitriger Gilbert & Cramer; from the type. 
branchiostegal membranes naked; vent in center of a naked, somewhat elliptical basin surrounded by 
a ridge of tubercles; a shallow pit behind base of ventrals; head vertical in front; the tentacular pit 
t riangular, higher than wide, its upper angle on level with upper edge of pupil, the pit surmounted by 
a large conical median tubercle projecting upward and slightly forward, the length about 2 in orbit; 
at each side of this tubercle a smaller one projecting upward and outward; the club-shaped tentacle 
when extended not quite reaching front of upper jaw; eyes large, the orbits strongly convergent, dis¬ 
tance between their anterior edges 2.5 in distance between their posterior edges; mouth somewhat 
oblique; bands of very minute teeth on jaws, vomer, and palatines; width of mouth and diameter of 
orbit about equal; gills 2 on each side, only a narrow membrane on first arch; gillrakers minute; sub- 
opercular spine ilat, long, extending laterally and armed at tip with 2 to 5 small spinelets; pectoral 
about 4.5 in length of body, the rays very close-set; ventrals about 7 and caudal 6 in length of body; 
vertical fins weak. Color in alcohol, body and all the fins pale yellowish'; peritoneum dusky. In 
water of moderate depths about the Hawaiian Islands. 
Malthopsis mitriger Gilbert & Cramer, Proc. U. S. Nat. Mus., XIX, 1897 (Feb. 5, 1897), 434, pi. xi.vnr, figs. 1, 2, Albatross 
Sta. 3467, 3472, or 3476 (type, No. 47700 U. S. N. M.). 
