232 WAITE 
TRACHURUS Rafinesque, 1810. 
TRACHURUS PICTURATUS Bowdich. 
Horse MACKEREL. 
Seriola picturata Bowdich, Excursion to Madeira, 1825, p. 123, 
fig. 27. 
Stations 72, 74, 80, 89. 
D. viii. 1. 29; A. ii. 1. 26; V.i.5; P. 21; 0.18 + 8; Se. 44 + 41. 
The specimens obtained agree with this species as diagnosed 
by Jordan and Evermann?®® exhibiting the following characters: 
The anterior scutes are low, not more than one-third the height 
of the posterior ones, and the curved portion of the lateral line 
is almost as long as the straight portion: the maxillary is 
relatively short, not reaching beyond the anterior margin of the 
orbit and the lining of the opercle is merely clouded with black 
On the other hand, the depth of the body and the number of 
scutes is intermediate between the figures suppled for the two 
species. The large size of the specimens is another feature in 
common with 7. picturatus, and the writers referred to have 
apparently identified New Zealand examples with this species. 
It was trawled on four occasions, namely, twice in Palliser Bay, 
once north of Cape Turnagain, and once in the Bay of Plenty. 
The indicated depths range from 13-94 fathoms, but it cannot 
be certain that the fishes were taken on the bottom. 
Length. 420 mm. 
As it is well known, members of this family are particularly 
prone to harbour Isopodous parasites in their throats; writing 
of the Yellowtail of New South Wales, Ogilby*? says :—‘‘ These 
fishes almost without exception suffer from being the host of an 
isopodous crustacean of the genus Anilocra, which lives in the 
throat, and thus obtains both sustenance and protection for 
itself; though it is common to take this commensal from the 
Sead with its developed ova attached we have never found more 
than one in a single fish.’’ 
The specimens from the New Zealand fishes have been kindly 
identified by Dr. Chilton as Meinertia imbricata Fabricius 
(Ceratothoa banksii Miers, Cat. N.Z. Crustacea). From one 
specimen I obtained eight individuals representing an adult 
and young in various stages. 
(39) Jordan and Evermann, Bull. U.S. Nat. Mus., 47, i. 1896, p. 909. 
(40) Ogilby, Edible Fishes N.S. Wales 1893, p. 79. 
