NO. 3656 COPEPODS—LEWIS v1 
is not discernable from the single female in the collection of copepods 
from Eniwetok fishes. 
The species name is derived from the Hawaiian name, “alaihi,’’ for 
several of the holocentrid fishes, the family to which the host of this 
copepod belongs. 
Caligus laticaudus Shiino 
Figures 29, 30 
Caligus laticaudus Shiino, 1960, p. 482, figs. 5, 6.—Pillai, 1961, p. 91, fig. 3— 
Yamaguti, 1963, p. 55, pl. 68, fig. 4. 
Hosts AND DISTRIBUTION.—3 host records: 
locality host reference 
Japan Pagrosomus major Shiino, 1960 
South India Polynemus heptadactylus 
Rhabdosargus sarba Pillai, 1961 
Mareriau.—1 female (USNM 120769) from the external surface of 
Acanthurus olivaceous Bloch and Schneider. 
MEASUREMENTS (in mm).—1 female: 
Total length, excluding caudal setae 
Length of cephalothorax 
Width of cephalothorax 
Length of genital segment 
Width of genital segment 
Length of abdomen 
Length of egg strings (not present, condition suggests specimen an 
immature adult) 
QS et 
RATAN 
BNO 
Description (female only).—Cephalothorax (fig. 29a) ovoid, con- 
sisting of cephalon, maxilliped-bearing and first 3 pedigerous segments. 
Frontal region approximately one-ninth the length of cephalothorax, 
with narrow membrane along anterior margin. Lunules (fig. 29e) 
distinct, extending posteriorly, on ventral surface, to posterior por- 
tion of frontal region, of relatively simple construction in comparison 
with those of Caligus coryphaenae. Division between frontal region 
and rest of cephalothorax distinct. Lateral margin of cephalothorax 
flatly convex, bearing single, narrow membrane extending laterally; 
posterior lateral surface lappet-shaped, with small, cupshaped in- 
dentation bearing 2 clusters of hairlike processes. Posterior sinus 
(fig. 29c) U-shaped, with membrane along outer margin. Median 
posterior surface of cephalothorax extending slightly past lateral 
posterior surfaces, posterior margin irregular on single specimen in 
collection. Major dorsal cephalothoracic grooves forming irregular H, 
anterior legs of H terminating well posterior to ocular region. Ocular 
region distinct, in anterior third of cephalothorax. 
