86 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
41. Callechelys luteus Snyder. Plate 8, fig. 1. 
Head, measured to upper edge of gill-opening, 16.6 in length, 10.5 in head and trunk, 6.7 in 
tail; snout 7.1 in head; cleft of mouth 3.4. Body extremely long and slender, tapering gradually 
from head to tail; depth at gill-opening 2.7 in head; width of body 1.4 in depth; gill-pouches 
greatly expanded, making head deeper and broader than body; snout sharp, projecting two-thirds of 
its length beyond lower jaw; eye midway between tip of snout and angle of mouth; tongue small, 
free on sides and at tip; teeth on jaws and vomer projecting backward, movable though not depress- 
ible; 3 large canines just posterior to nostril tubes, the median one being anterior to tip of lower jaw; 
2 short rows of teeth on vomer, a single row on maxillaries and on lower jaw; anterior nostril with 
a tube equal in length to diameter of eye, inferior in position, halfway between tip of snout and end 
of closed lower jaw; posterior nostrils on lip, below the eye, provided with an anterior, valve-like flap; 
gill-openings slit-like, inferior, distance between lower edges of openings equal to half the length of 
snout; width of gill-opening equal to distance from tip of snout to posterior border of eye. Dorsal 
inserted on occiput above angle of mouth; height at a point above gill-slit- equal to distance between 
tip of snout and posterior border of eye, above anal opening equal to width of gill-slit; fin not reach- 
ing tip of tail; membrane thin, the rays being distinctly visible; anal inserted immediately behind 
vent, its height equal to half the width of gill-opening; tip of tail sharp, there being no caudal fin; 
pectorals absent. 
Color in alcohol, white, rather finely blotched with brownish black, the spots not so numerous on 
ventral surface as elsewhere; tins colored like body. In life, the upper parts, including dorsal fin, are 
white, mottled with black and lemon-yellow; under parts white, rather sparsely mottled with black, 
except on throat, where the spots are numerous. 
One example, 22.3 inches long, caught while swimming about the ship at night, attracted by the 
lights. 
Type, No. 50864, U. S. Nat. Mus., southern coast of Molokai. 
Callechelys luteus Snyder, Bull. U. S. Fish Comm., XXII, 1902 (Jan. 19, 1904), 517, pi. 3, fig. 5, Albatross Station 3821 , near 
the southern coast of Molokai. 
Family XXXII. MORINGUIDiE. 
Body cylindrical, more or less slender, the tail much shorter than rest of body, usually bluntish, 
with a fin at the top. Posterior nostrils in front of the small eye; mouth small; teeth small, uniserial; 
gill-openings rather narrow, inferior; heart placed far behind the gills; pectorals small or wanting; 
dorsal fin low, mostly confined to the tail. Small eels of the tropical seas, often very slender or 
worm-like, and noted for the extreme shortness of the tail. The genera are closely related and 2 of 
them, Moringua ( =Raitnboura=Stilbiscus ) and Aphlhalrnichthys, are found in the West Indies as well as 
in the East- 
Genus 53. MORINGUA Gray. 
Characters included with those of the family. 
Moringua Gray, 111. Ind. Zool., II, fig. 1 (linearis), 
StHbiscus Jordan & Bollman, Proc. U. S. Nat. Mus. 1888, 541 ( edwardsi ). 
42. Moringua hawaiiensis Snyder. Plate 8, fig. 2. 
Head, measured to gill-opening, 15.4 in length; tail 3.3; depth 4.16 in head. Body cylindrical 
and extremely elongate, the tail tapering to a sharp point; snout pointed, its length 6.7 in head; 
lower jaw projecting beyond upper a distance equal to diameter of pupil; cleft of mouth extending 
beyond eye a distance equal to pupil; teeth on jaws and vomer sharp, long, and fang-like anteriorly; 
tongue adnate to floor of mouth; eye very small, the diameter equal to about 5 in snout; gill-opening 
a vertical slit, equal to 1.7 in length of snout; lateral line slightly arched above branchial chamber, 
discontinued about a head’s length from tip of tail; number of pores 113. Pectorals present, minute, 
the rays easily distinguishable; the base equal to half the gill-opening, length a little less than 
diameter of pupil; dorsal and anal fins scarcely developed, indicated by slight ridges commencing 
