DIODONTIDAE. 
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Diodon holacanthus Linnaeus, /~ #+ DD CF Comm idA Do 
Head 2 3/4 to 2 7/8; depth (collapsed) 21/2 to 2 3/4; 
greatest body width about @ 1/4 to 2 2/5; D. it or £14, le te 
bos Ay 4, OF 32,00 or 147 P.°i,' 203 snout 22/3 to 8 3/4 in 
head; eye 4 1/4 to 4 4/5; bony interorbitel 1 2/3 to 2 1/8, 
slightly concave in smaller example, slightly convex in larger; 
post-pectoral spines 1 to 1 1/4 in frontal spines, eye 1 1/2 
to 2. Color in alcohol pale brownish, smaller exemple darker 
above, and both with upper surface marked with small dusky- 
brown to blackish spots; which larger and more contrasted along 
sides of smaller. harger with fewer and smaller spots, Fins 
all uniform pale brownish. Ynder body surface uniform whitish. 
Iris dull yellowish. Length 105 to 150 mm. Yne from Oahu and 
nod > PY, 7 a ae 
one from Tehiti., is trauma Zp 4 [Other er Moud 
en comparison with exemples of D, hystrix in the Academy 
from Pomama and Bahamas, the letter slightly larger, we find 
the American material shows shorter prefrontal spines, which 
about equal postpectoral spines. They also have large dark 
blotches, duskyObrown, on head and back above. tn the larger 
example the spots on the back are lerger than in the Polyne- 
sian examples, and though it has an immaculate abdomen the 
Paname specimens have the abdomen covered with smell dark spots, 
They s ow the interorbital variably level to slightly concave, 
