104 
PACIFIC SCIENCE, VoL VII, January, 1953 
Carpal articles of second legs variable, but 
ratio usually within following range: 10 : 15- 
21 : 5-7 : 5-7 : 9-12. 
Third legs with spine on ischium. Merus 
2. 7-3.1 times as long as wide, with strong sub- 
apical tooth on inferior margin. Carpus with 
acute tooth on distal end of inferior margin, 
without movable spines. Propodus with 10 
movable spines along inner margin. Dactylus 
simple, curved, acute. 
Pleura of abdomen rounded in both sexes. 
Telson broad, flat, slightly tapering distally, 
point of greatest width 1.3-1. 8 times as wide 
as posterior margin, length 2. 7-2. 9 times 
breadth of posterior margin; both pairs of 
dorsal spines heavy, 0.3 and 0.6 of distance 
from point of articulation. 
In addition to usual setiferous bristles pos- 
terior margin of telson with about 10 small 
spinules, these difficult to discern. Inner 
branch of uropod also with series of strong 
movable spinules, about 20, along postero- 
lateral margins. 
Specimens reaching 16.0 mm. in length; 
color in life not observed. 
DISCUSSION: Inquiry at the major American 
museums revealed no records of Stimpson’s 
type specimen, so it is presumed to have been 
lost. Unfortunately from Stimpson’s descrip- 
tion it is not possible to determine the exact 
type locality, for all that he specified was, "in- 
sulas Hawaienses; inter ramos madreporar- 
um." The neotype meets those specifications. 
All the specimens available were examined 
carefully, but a group of specimens from Wai- 
kiki Reef which exhibited the usual range of 
variation were studied in greater detail. In this 
group, the variable characteristics were meas- 
ured as accurately as possible and the results 
are here summarized. 
Anterior region of the carapace: The dorsal 
Carina varied from broad and dorsally rounded 
to narrow and acute; in no specimen did it 
reach the anterior tip of the rostrum. The vari- 
ation in thickness of the anterior ridge of the 
orbital hoods may be seen in the drawings. 
One of the most variable characteristics was 
that of the anterior margin of the carapace be- 
tween the ridges of the orbital hoods and the 
rostrum; this varied from a concave margin in 
which the tip of the short rostrum did not 
reach the anterior margins of the orbital 
hoods, to a straight margin with the rostrum 
reaching beyond the hoods; in some speci- 
mens the frontal region was asymmetrical. 
Antennules and antennae: The observed range 
in proportions of the articles of antennular 
peduncle is reported in the description. The 
relative length of the scaphocerite also varied, 
but without exception it was no shorter than 
the antennular peduncle and no longer than 
the carpocerite. In all specimens the basicerite 
lacked a lateral spine. 
Chelipeds: Some of the variation of this sex- 
ually dimorphic appendage is indicated in the 
description. It was also found to differ in the 
degree of compression, with the breadth al- 
most equaling the height in some specimens 
while in others the breadth was only about 0.7 
of the height. The palm was found to vary 
from 1.5 to almost 3.0 times the length of the 
merus. In none of the specimens did the merus 
have an acute tooth on the end of the inferior 
internal margin, but although the margin was 
straight in most cases, a few specimens were 
found to bear a small obtuse and rounded pro- 
jection. 
The small cheliped was quite uniform ex- 
cept for the slight sexual dimorphism de- 
scribed above. 
Second legs: The range of variation of the 
carpal articles has been given; a further dis- 
cussion of this variation is given below where 
C. hrevipes is contrasted to C. clypeata (Cou- 
tiere) . 
Third legs: These appendages were quite 
constant in armature and proportions, with 
the ischium always bearing a spine; the merus 
varying from 2.7 to 3.0 times as long as broad, 
that of the smaller specimens being more nar- 
row than the larger; the merus always with a 
strong distal tooth; the propodus always bear- 
ing strong spines; the dactylus always simple. 
However, in the smallest specimens (those 
