FISHES OF HAWAIIAN ISLANDS. 
203 
The genus Collybus differs from Taractes in not having teeth on the vomer and palatine hones, in 
having the caudal deeply cleft, the ventrals inserted posterior to the middle of the bases of pectorals, 
and in not having the opercular bones denticulated. 
Collybus Snyder, Bull. U. S. Fish Comm., XXII, 1902 (Jan. 19, 1904), 525 ( drachme ). 
156. Collybus drachme Snyder. Plate 34, fig. 1. 
Head, measured to end of opercular flap, 3.3 in length (snout to base of caudal); depth 1.7; depth 
of caudal peduncle 3.6 in head; eye 2.8; snout 4.9; maxillary 2.2; interorbital space 3.3; D. 34; A. 30; 
scales in lateral series 51, — 19. 
Body greatly compressed, its width at the widest part equal to length of maxillary; upper contour 
rather evenly curved from snout to caudal peduncle; lower contour much more convex, the base of 
anal not curved; mouth nearly vertical; lower jaw projecting somewhat beyond upper, posterior edge 
of maxillary reaching a vertical through anterior edge of pupil; teeth small, weak, sharply pointed, 
in narrow bands (2 or 3 rows) on jaws; 2 larger, fang-like teeth on each side of tip of lower jaw; no 
teeth on vomer and palatines; pseudobranchiae large, the filaments equal in length to twice diameter 
of pupil; gillrakers 4+10, slender, long, and sharply pointed; edges of operc.le, interopercle, sub- 
opercle, and preopercle smooth; lower jaw, snout, and interorbital area naked; other parts of head, 
including the maxillary and the body, closely scaled; scales strongly ctenoid, the ridges with minute 
tubercles; each scale with a high vertical ridge, on the middle of which is a prominent knob; the 
ridges of the scales hidden by the overlapping softer parts, the knobs projecting, lying in longitudinal 
rows; scales short, but very broad vertically, the upper and lower edges sharply pointed; scales of 
head, at base of pectoral and along the bath much smaller than the others; no evident lateral line. 
Dorsal inserted on a vertical passing. behind base of pectoral a distance equal to diameter of pupil, 
rays 34, the anterior 3 or 4 without articulations; fin elevated anteriorly, the longest ray 1.4 in head; 
posterior rays 3.6. Anal rays, except first 1 or 2, articulated; length of anterior rays 3.6 of head; caudal 
deeply forked; pectoral pointed 3.2 of the length; ventrals inserted on a vertical passing through pos- 
terior half of base of pectoral. 
Color bright silvery, dusky on upper part of head and along back; a silvery spot about the size of 
pupil at insertion of dorsal; upper and lower rays of caudal dusky; central part yellowish white; 
anterior rays of dorsal dusky. 
The type, No. 50875, U. S. Nat. Mus., is a Specimen 6 inches long, from station 4176, off Niihau, 
evidently near the surface. Other examples, among which are cotypes, 7737 L. S. Jr. Univ. Mus., 
were obtained from the stomach of a Coryphxna at Honolulu. Small squids and fishes were taken 
from the stomach of the specimen here described. A specimen seen in the Bishop Museum. 
Collybus drachme Snyder, Bull. U. S. Fish Comm., XXII, 1902 (Jan. 19, 1904), 525, pi. 9, fig. 10, Albatross Station, 4176 , off 
Niihau. 
Family LVI1. CORYPHJJNIDtE. — T he Dolphins. 
Body elongate, compressed, covered with small cycloid scales; cleft of the mouth wide, oblique, 
the lower jaw projecting; cardiform teeth in the jaws and on the vomer and palatines; a patch of villi- 
form teeth on tongue; no teeth in esophagus; opercular bones entire; skull with a crest which is much 
more elevated in adult, than in young; a single, many-rayed dorsal fin, not greatly elevated, extending 
from nape nearly to caudal fin; anal similar, but shorter, each without distinct spines; pectoral very 
short and small; ventrals well developed, thoracic, 1 , 5, partly received into a groove in the abdomen; 
caudal fin widely forked; lateral line present; gill-membranes free from isthmus; brancliiostegals 7 ; no 
pseudobranchite; no air-bladder; pyloric appendages very numerous; vertebrte about 30. A single 
genus with probably but 2 species. Very large fishes inhabiting the high seas in warm regions, noted 
for their brilliant and changeable colors. 
Genus 117. C0RYPH7ENA Linnseus. 
Characters of the genus included above. The species are not well known, having been unduly 
multiplied by authors. According to Dr. Lutken they are probably reducible to 2; both known to 
occur among the Hawaiian Islands. 
