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PACIFIC SCIENCE, Vol. VII, January, 1953 
Coutiere’s specimens. It should be noted that 
on the left side of the described specimen 
(Fig. 45^) the spine of the basicerite was [like 
that shown by Coutiere, but the one on the 
right was entirely absent. The large and small 
chelae are similar, but the merus of these ap- 
pendages in the type may or may not have 
the series of fine indentations found in the lo- 
cal specimens, for Coutiere’s plates are not 
clear at the point. The third legs are similar 
except that Coutiere does not indicate the 
ischial spine, although he does state that the 
appendage "est tres semblable [to C dasy- 
cheles (Cout.)] comme forme ...” and that C. 
dasycheles has the spine. Finally, on the tip of 
the telson and on the inner uropod he indi- 
cated no spinules; these, however, are very 
difficult to discern on the local specimens be- 
cause they are confused with the bases of the 
setiferous bristles, and it is likely that Cou- 
tiere merely overlooked them. 
In my opinion none of these differences are 
of sufficient magnitude, constancy, or general 
reliability to warrant the erection of a new spe- 
cies for the local form. 
The characteristics which will distinguish 
this from closely related local species are 
given in Table 5. 
DISTRIBUTION: The three specimens col- 
lected locally came from Oahu in 20 feet of 
water at Hanauma Bay, in 15 feet of water off 
Nanakuli, and at Halape, Kau Coast, Hawaii, 
in water 35-40 feet deep (last collected by R. 
W. Hiatt). 
Brevirostris Group 
' Crangon rapax (Fabricius) 
Fig. 46 a-i 
Alpheus rapax Fabricius, Sup. Ent. Syst. p. 
405, 1798. 
Alpheus malaharkus Hilgendorf, K. Akad. 
Wiss., Berlin, Monats. p. 832, 1878. 
Alpheus brevirostris de Man, Linn. Soc. Lon- 
don, Jour. 22: 261, 1888. 
Alpheus rapax de Man, Soc. Zool. France, 
Mem. 22: 147-155, 1909. [Species rede- 
scribed and illustrated; see these and the 
following pages in this reference for a com- 
plete synonymy.] 
DESCRIPTION: Rostrum small, acute, equi- 
lateral, tip reaching to end of first 0.3 of 
visible portion of first antennular article; ros- 
tral Carina anteriorly sharp, posteriorly some- 
what rounded, extending to end of orbital 
hoods. Orbital hoods large, inflated, rounded 
anteriorly, posteriorly merging with the cara- 
pace; higher in middle than rostral carina; 
transparent, hence from side rostral carina 
visible through hood. Anterior margin of 
carapace from orbital hoods to rostrum al- 
most straight. 
Antennular peduncles elongate and thin, 
second article 3. 5-4.0 times as long as broad, 
2.5 times length of first article or of third 
article. Stylocerite rounded, leaf-like, anterior 
spine represented by very small tooth reaching 
about 0.75 of length of visible portion of first 
antennular article. Antennular articles with 
few short bristles near points of articulation; 
stylocerite with fringe of short bristles on 
margins. Basicerite with distinct but short 
tooth about same length as rostrum. Scapho- 
cerite with strong lateral spine, squamous 
portion narrow; lateral margins concave. Sca- 
phocerite slightly longer than carpocerite 
which reaches to end of antennular peduncle. 
Distal articles of third maxillipeds large, of 
usual form, densely bristled on inner face. 
Large chela high, compressed, margins 
rounded, 2.7 times as long as high, about 
twice as high as wide. Upper surface with 
rounded transverse groove extending short 
distance down each face. Dactylus strong, 
high, compressed, 0.35 as long as entire chela. 
Carpus of usual form. Merus 2.6 times as long 
as broad, with superior distal angle rounded, 
inferior internal margin with 5 movable spines 
and acute terminal tooth of moderate size. 
Dactylus, margins of palm, superior and in- 
ferior internal margins of merus with scattered 
long setae. 
