DESCRIPTIONS OF FISHES FROM THE HAWAIIAN ISLANDS. 
399 
Family TR.OPIDICHTHYIDH3. 
Tropidichthys jactator Jenkins, new species. Fig. 11. 
Head 2.66 in length of body; depth of body from back to lower edge of base of pectoral 3.33 in 
length. Eye equal to interorbital space, 2 in snout. D. 9; A. 10; P. 16; C. 7. Profile rising from 
tip of snout to middle of back where the median dorsal crest forms a prominent point. Dorsal profile 
of head concave from tip of snout to eyes, straight from eyes to dorsal prominence. Interorbital 
space very slightly concave. Profile descending to a straight line from apex of back to dorsal fin, from 
dorsal fin to caudal fin descending with gentle concavity. Caudal peduncle deep anteriorly, depth 
just back of dorsal and anal fins equal to snout; much less deep posteriorly, depth just before bases of 
caudal rays 2.33 in head. Ventral parts of body much dilated, depth below pectoral 1.25 in depth above 
pectoral. Dorsal and anal fins very short, dorsal above anal; rays equal, about 3 in head. Caudal 
slightly rounded, median rays equal to snout. Pectoral wide, distal edge slightly concave; upper rays 
longest, 2.66 in head. Body and head everywhere except on caudal peduncle covered with small asperi- 
ties consisting of small, erectile, two-rooted spines directed backward; spines largest on belly. 
Color in alcohol : Dark 1 irown above and on sides, belly pale yellowish ; dark parts with numerous, 
regularly distributed, pale (apparently bluish in life), round or polygonal sjiots; spots largest on sides 
where the brown ground-color appears as a network between them, obsolete on fore part of head in one 
specimen, extending distinct to tip of snout in a smaller one, none smaller than pupil, those on sides 
three-fourths of eye in diameter; dusky ring about eye, most conspicuous above; fins colorless. 
11. Tropidichthys jactator Jenkins, new species. Type. 
Very similar to Tropidichthys punctatissimus (Giintlier) 1 of the west coast of tropical America, but 
differs from this species in the much greater size of the spots (none of them in C. punctatissimus being 
greater than the pupil) and in having the belly much more distended. 
( Jactator , boaster.) 
Two small specimens, 30 and 42 mm. in length, taken by me at Honolulu, l have compared these 
with 7 specimens, 35 to 60 mm. in length, of C. punctatissimus in the Stanford University collection, 
taken at Panama by Dr. C. H. Gilbert. Type No. 49703, U. S. N. M. 
Genus EUMYCTERIAS Jenkins, new genus. 
General characters of Tropidichthys Bleeker (= Ccmthigaster Swainson, diagnosis only; no type), 
the back being compressed and produced into a blunt prominence midway between the eyes and the 
dorsal fin. The nostrils, however, consist of a single simple opening on each side. In Tropidichthys 
the nostrils are obsolete. 
(Ev, true; pvKrpp , nostril.) 
1 Tetrodon punctatissimus Gunther, Cat, Fishes Brit. Mus., vm, p. 302, 1870 (Panama). 
Tetrodon oxyrhynchus Loekington, Proc. Acad Nat. Sci. Phila. 1881, p. 116 (Gulf of California). 
