275 
Varathunnus in 
Hawaiian Waters — BROCK 
mentioned by Kishinouye (1923: 444), Para- 
thunnus is not known from the eastern tropical 
Pacific, yet it may well be abundant in the tuna 
grounds now exploited by the California tuna 
fishermen. Its abundance in the eastern Pacific 
will not be determined until fishing gear, 
capable of taking it is tried in those waters. 
The Parathunnus fishery serves to point up 
the fact that the fishing techniques now avail- 
able for taking oceanic species may be inade- 
quate to exploit these species in proportion to 
their actual abundance in the sea. There is a 
possibility that in some areas now fished, marine 
food resources of considerable magnitude, not 
only untapped but unknown, may exist. 
KEY TO THE TUNAS AND TUNA-LIKE FISHES OF 
HAWAII 
The following key is to the tunas and tuna- 
like fishes reported from Hawaiian waters. 
Those species marked with an asterisk are com- 
monly taken about the Hawaiian Islands; those 
not so marked either do not occur in this area, 
or else are rare, and have not been seen by the 
author among fish landed at any Hawaiian port. 
Two species, Semathunnus itosibi (Jordan 
and Evermann) and Gr animator cynus thomp- 
soni (Fowler), described from the Hawaiian 
Islands are not included in the key. Sema- 
thunnus itosibi — Neothunnus macropterus, as 
understood here; Grammatorcynus thompsoni is 
probably a scomberomorid or gempylid synon- 
ymous with Lepidocybium flavo-brunneum 
( Smith ) . 
1. First dorsal fin with 10 to 18 spines; 
body not over five times as long 
as greatest depth 2 
First dorsal fin with about 25 
spines; body long and slender, at 
least six and a half times as long 
as greatest depth. Ono 
* A canth o cybium 
solandri (Cuvier & Valenciennes) 
2(1). Body completely scaled, scales may 
be enlarged in corselet and on 
lateral line 5 
Body naked, without scales, except 
for the scaly corselet and lateral 
line 3 
3(2). The last spine in the first ( spinous ) 
and the first ray in the second 
(soft rayed) dorsal fins close to- 
