814 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The Hawaiian skulls in one respect differ from all those from the Indian Ocean, 
namely, that the portion of the maxilla between the maxillary notch and the orbit is 
thinner. This and the somewhat larger size are the only two points in which these 
Hawaiian skulls appear to differ from the types of P. attenuatus and P. capensis. I 
do not think these are sufficient to warrant a separation of species. 
As P. attenuatus is a species founded on cranial characters only, the coloration and 
external proportions of the Hawaiian heads, the size of the fins, and number of pha- 
langes can not be brought into consideration in connection with it. It is of interest, 
however, to see how they compare with the same characters in Dr. Abbott’s Indian 
Ocean specimens. 
The coloration of the two Hawaiian heads is noted on a previous page. No 
doubt they were somewhat altered by post-mortem changes and the effects of the 
preservative when I examined them, but these would effect chiefly a deepening of 
the shades of gray. Beside the heads, I received, as already mentioned, a sketch of 
one of the specimens (PI. 1) one-sixth natural size, but the sex was not recorded. 
It is dated June 7, 1901, and represents No. 112833 U.S.N.M. 
In this sketch the specimen is represented as very dark gray, nearly black, on 
the upper surfaces, head, dorsal fin, upper surface of pectoral fin, upper and lower 
surfaces of flukes, posterior portion of caudal peduncle, and anterior half of mandible. 
The lower surfaces, from the middle of the mandible to within about 9 inches of the 
flukes, and as high up as the line of the insertion of the pectorals, are white, a little 
tinged with gray. The light and dark colors meet rather abruptly on the sides, but 
without a well-defined line of demarkation. The white of the lower, surfaces is 
covered with oblong gray spots about three-fourths of an inch long. Similar spots 
are seen obscurely in the darker color higher up on the sides. 
This sketch and the notes on page 44 indicate that the Hawaiian specimens resem- 
bled Dr. Abbott’s Indian Ocean specimens very closely in coloration. In all of the 
latter, however, except one, the light and dark colors were said to be separated by a 
sharply-defined line. This is hardly true of the Hawaiian specimen represented b}^ 
the water-color sketch, but on the other hand the colors can not be said to merge 
gradually into each other. If the hypothesis that males in this species have gray spots 
while females have white spots be accepted, the Hawaiian specimens should be males. 
The following measurements of the Hawaiian specimen from which the sketch 
was made were taken when it was first obtained, June 7, 1901: 
No. 112833, U.S.N.M., Honolulu, Hawaii, June 7, 1901. 
Inches. 
Total length 76 
Tip of snout to “ stop ” 5 
Tip of snout to eye 13 
Tip of snout to origin of pectoral 18 
Tip of snout to origin of dorsal 35 
Length of upper jaw 11.5 
Length of lower jaw 11. 63 
“Gape” 11.5 
Length of eye 1 
Length of pectoral 11.5 
Height of dorsal 11 
Height of dorsal "straight up ” 7 
Inches. 
Length of base of dorsal 9 
Least depth of caudal peduncle 3 
Expanse of flukes 18 
"Length of flukes” 5.5 
Distance from anus to notch of flukes 20 
Distance from anus to "tip of flukes” 21 
Distance between bases of pectorals in front 6. 5 
Greatest depth of body 14 
Girth in front of pectorals 28.25 
Girth immediately behind pectorals 30. 5 
Girth in front of dorsal 33 
