Fish Fauna of Johnston Is. — Gosline 
453 
form of the black and white Chromis leucurus. 
Comparison of the same two forms from Ha- 
waiian material provides the following infor- 
mation: (1) the black and white and the 
brown specimens differ little in morphological 
features or in counts (Table 2) ; (2) ripe indi- 
viduals of both sexes occur in both color 
forms; and (3), though the two color forms 
overlap in size ranges, the plain brown form 
is represented only by specimens 47 to 70 mm. 
in standard length, whereas black and white 
specimens range from 17 to 57 mm. In life 
both forms may be seen over the same coral 
head. Presumably the brown form represents 
an ontogenetic color change that occurs after 
maturity has been attained. 
Chromis vanderbilti (Fowler) 
1 spec., 35 mm., 1951. 
This specimen differs from Hawaiian and 
Wake Island material in lacking the black on 
the lower caudal lobe. There appear to be no 
other differences. Dorsal XII, 11; anal II, 11, 
the anterior two-thirds black, becoming 
abruptly light posteriorly. 
Dascyllus albisella Gill 
12 specs. 43-88 mm., 1951; 2 specs., 69-75 
mm., Brock, 1948. 
Though no specimens of Dascyllus trima- 
culatus are readily available, the Hawaiian form 
seems to differ, among other features, in hav- 
ing more dorsal and anal soft rays. The 
present (1951) specimens agree with the Ha- 
waiian form in having 15 dorsal soft rays in 
two specimens and 16 in ten, 14 soft rays in 
the anal of one specimen, and 15 in the anal 
of eleven. 
*Dascyllus marginatus (Riippell) 
Halstead and Bunker, 1954, 4 specs. 
Plectroglyphidodon johnstonianus 
Fowler 
8 specs., 27-80 mm., 1951. Fowler and Ball, 
1925, 1 spec. As Abudefduf johnstonianus, Hal- 
stead and Bunker, 1954, 1 spec. 
Lips plicate; dorsal XII, 18; anal II, 16 
or 17. 
LABRIDAE 
*Bodianus bilunulatus (Lacepede) 
As Harpe bilunulata , Smith and Swain, 
1882, 1 spec. 
Cheilinus rhodochrous Gunther 
3 specs., 146-205 mm., 1951. Halstead and 
Bunker, 1954, 5 specs. As Cheilinus digramma , 
Smith and Swain, 1882, 3 specs., and Fowler 
and Ball, 1925, 1 spec. 
The 1951 specimens have the elongate 
head, white band on the caudal peduncle, and 
IX dorsal spines that seem to characterize this 
species. No black lines radiating downward 
from eye. 
Epibulus insidiator (Pallas) 
9 specs., 73-255 mm., 1951. Fowler and 
Ball, 1925, 2 specs.; Halstead and Bunker, 
1954, 4 specs. 
Lower jaw extending backward to isthmus. 
*Gomphosus tricolor Quoy and Gaimard 
Fowler and Ball, 1925, 2 specs. 
Gomphosus varius Lacepede 
16 specs., 27-106 mm., 1951; 4 specs., 27- 
89 mm., Brock, 1948. 
A dark stripe through eye; vertical fins 
dark. 
Halichoeres ornatissimus (Garrett) 
1 spec., 58 mm., 1951. Fowler and Ball, 
1925, 2 specs., these reexamined. 
These specimens all have the characteristic 
dark mark just behind the eye. 
Novaculichthys taeniourus (Lacepede) 
1 spec., 119 mm., 1951. 
Only four lines radiating out from the eye. 
Pseudocheilinus sp. 
12 specs., 30-55 mm., 2 specs., 40-46 mm., 
Brock, 1948. 
First dorsal rays usually produced into 
elongate filaments; two longitudinal scale 
rows on cheek below eye; three or four black 
longitudinal lines along upper sides; back- 
ground color of body bluish; 16 rays in the 
