438 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
361. Diodon nudifrons Jenkins. “Oopu kawa.” Fig. 193. 
D. 15; A. 12; forehead sloping upward from snout at angle of about 45°; interorbital 1.3 in head; 
spines mostly short, not longer than eye, except those back of pectoral, the longest of which are equal 
to length of pectoral and about 2 in head; no spines on forehead below level of upper margins of eyes; 
foremost spines of head few and short; head, back, sides, all the fins and the membranous sheaths of 
the spines closely covered with small, roundish, black spots, much smaller than pupil; below pale; a 
brown band from below gill-opening forward along lower angle of head to below eye, then across 
throat continuous with corresponding band of opposite side. Known only from one specimen, 21 
inches long, obtained by Doctor Jenkins at Honolulu, and from several examples recently seen in the 
Waikiki aquarium. 
Diodon nudifrons Jenkins, Bull. U. S. Fish Comm., XXII, 1902 (Sept. 23, 1903), 488, fig. 35, Honolulu (type, No. 50854, U. S. 
N. M.; coll. O. P. Jenkins). 
Genus 198. CHILOMYCTERUS Bibron.— The Burr-fishes. 
Body broad, depressed, moderately inflatable; dermal spines short, stout, immovable, triangular, 
each with 3 roots; nasal tube simple, with 2 lateral openings; the tube sometimes rounded, sometimes 
flattened, and with the partition feeble and easily torn, so that the tentacle appears divided; caudal 
peduncle short; fins small, formed as in Diodon; jaws without median suture. 
Species numerous, of smaller size than those of Diodon, the spines broader and lower, their bases 
forming a coat of mail. Only one species known from the Hawaiian Islands. 
Chilomycterns Bibron in Barneville, Rev. Zoologique 1846, 140 (reticiilatus=tigrinus) . 
Chilomycterus Kaup, Wiegmann’s Arehiv 1847, 365 ( antennatus ). 
Cyclichthys Kaup, op. cit., 1855, 231 ( orbicularis ). 
Cycmichthys Kaup, op. cit. (cocruleus). 
Diodon Bleeker, Atlas Ichth., V, 1865, 54 ( atinga , the first species named by Linnseus); not Diodon as properly restricted 
by Kaup to Diodon hystrix. 
362. Chilomycterus affinis Gunther. “ Oopuhue.” 
Head 2.7; depth 3.5; snout 2.5; eye 4; preorbital 4.6; interorbital 1.6; depth of caudal peduncle 
5.2; length of gill-opening equals eye; D. 12; A. 10; C. 14; P. 20. 
Body short, stout and broad, its width at pectorals equal to length of head; anterior profile from 
tip of snout to interorbital concave; interorbital broad, concave, the supraocular rim not prominent; 
eye large, placed obliquely, the anterior margins being closer together than the posterior; mouth rather 
large, its width 1.6 in interorbital width; teeth strong, in a broad, fiat, rough plate, the cutting edge 
low and concave, the upper with a strong blunt point at middle; nasal tentacle flattened, somewhat 
bilobed, the surface with small, roundish cup-shaped cavities; gill-opening vertical, a little wider than 
base of pectoral; spines all short and blunt, increasing in length posteriorly except above and below, 
3-rooted, the anterior very long; a very low 4-rooted spine on posterior part of interobital space; 3 low 
supraocular spines followed by a row of 3 somewhat higher spines, the first of which is 4-rooted, the 
