426 
PACIFIC SCIENCE, VoL VII, October, 1953 
ditions must be ideal, requiring water which 
is well aerated and free of sediment. In con- 
sequence, I have found it necessary to assign 
the larval species on the basis of the adult 
characteristics. If one has identified all adult 
species occurring in a particular region, then, 
by studying the postlarval forms which show 
both adult and larval characteristics, it is pos- 
sible to correlate the larval forms occurring 
in the same region by working back from the 
adult species to the earliest recognizable lar- 
vae of those species. Using this method, I 
have been able to identify larval stages of 
Pseudosquilla as those belonging to adult P. 
ciliata. Larvae of Lysiosquilla and Squilla are 
likewise assigned to their respective species, 
but this identification is not positive. At this 
time larvae of Coronida and Odontodactylus can- 
not be referred to any definite species. Larval 
forms of Gonodactylus have not been found in 
these waters. 
The following key is designed to facilitate 
the identification of the larvae with their re- 
spective genera, and is intended to be used 
for larvae in all stages of development. There 
is no reference to species, but where the adult 
species is known it will be mentioned in the 
description given for each genus. 
Key to the Genera of Larval 
Hawaiian Stomatopoda 
A. Larvae hatch without raptorial claw (an- 
tizoea with biramous appendages on 
first 5 thoracic somites) or with rapto- 
rial claw (pseudozoea with only first and 
second thoracic appendages) and with 
the propodus finely pectinate along its 
upper margin; ischio-meral articulation 
of raptorial claw always terminal in later 
stages (Figs. 22^, B 
A A. Larvae always hatch with raptorial claw 
(pseudozoea) and the propodus never 
pectinate along its upper margin; ischio- 
meral articulation of raptorial claw at a 
point in advance of the proximal end of 
the merus in later stages (Fig. 28^). .E 
B. Larvae hatch with raptorial claw (Fig. 
22d)\ propodus of fourth thoracic ap- 
pendage rectangular, generally longer 
than broad, and only slightly broader 
than that of fifth (Fig. 23/) C 
BB. Larvae hatch with biramous thoracic 
appendages (Fig. 25^) which undergo 
transformation into typical subchelate 
form; propodus of fourth thoracic ap- 
pendage rounded, broader than long, 
more than twice as large as that of fifth 
(Fig. 21 h) D 
C. Telson with 4 or more intermediate den- 
ticles between submedian and lateral 
denticles (Fig. 22b) 
Squilla (alima larva) 
CC. Telson with 3 or fewer intermediate den- 
ticles between submedian and lateral 
denticles (Fig. 23^) ; 
.... Pseudosquilla (pseuderichthus larva) 
D. Propodus of raptorial claw broad, dac- 
tylus slightly inflated at base (Fig. 2Ge) \ 
Coronida (coroniderichthus larva) 
DD. Propodus of raptorial claw long and 
slender, dactylus not inflated at base 
(Fig- 25^) 
Lysiosquilla (lysioerichthus larva) 
E. Spines of telson greatly elongated (Fig. 
28^) 
. . Odontodactylus (odonterichthus larva) 
EE. Spines of telson not greatly elongated 
Gonodactylus (gonerichthus larva) 
Squilla sp.^, probably S. oratoria | 
Fig. 22a-d | 
STAGE 1 (Fig. 22a ) : This is the earliest stage j 
of the alima-type larva which has been found. ’ 
Larvae bear completely developed first and i 
second thoracic appendages, the second being ' 
in the form of a raptorial claw; propodus of ; 
this claw with two small spines near its prox- *| 
imal end, upper margin finely pectinate; dac- | 
tylus nearly straight, no teeth along inner | 
margin; eyes borne on long stalks, this con- ; 
dition being retained throughout successive i 
stages; antennules fully formed; antennal 
