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PACIFIC SCIENCE, Vol. XX, April 1966 
times as long as broad, instead of 7-10 times 
as long as broad (as taken from Bate’s figures), 
and a more narrow posterior margin of the 
telson, with the telson in the variety 6 times 
as long as broad, instead of 3-4 times. Not 
enough specimens of A. microstylus were avail- 
able to ascertain the full extent of variation 
on the carpus of the second legs, but in those 
available the length divided by the breadth 
of the second article varied from 6 to 8, and 
the telson, as illustrated by the wide span in 
the related A. ohesomanus, must also be ex- 
tremely variable. Therefore, this variety does 
not appear to be distinct, and the name should 
be listed in synonymy. 
5. A. lutini Coutiere. This species was 
characterized by having the second antennular 
article 1. 5-2.0 times the length of the first, 
and 2. 4-3.0 times as long as broad; the 
scaphocerite and carpocerite being equal, and 
slightly shorter than the antennular peduncle, 
but with the squamous portion of the scapho- 
cerite reaching only to the middle of the 
second article; the grooves of the large chela 
being deep and pronounced, the palm of the 
small chela 1.5 times the length of the fingers; 
the second carpal article of the second legs 
between 2.5 and 3-5 times as long as the first; 
the configuration of the third legs like that of 
A. ohesomanus; and the telson 6 times as long 
as the posterior margin is broad. As discussed 
above, this form is the more common type of 
the variable A. ohesomanus. 
6. A . species 2, Banner. This sole specimen 
from Saipan has the antennular peduncle about 
the same as that described for A. lutini, but 
while the carpocerite reaches to the end of the 
antennular peduncle, the scaphocerite reaches 
only to the end of the second antennular 
article; the palm of the second leg is twice 
the length of the fingers; the second and third 
legs are very much like those of A. ohesomanus, 
and the telson is 4.1 times as long as broad. 
(Note: the description [Banner, 1956:352} 
is in error on this point; it is 4.1 times as long 
as the posterior margin is wide and anteriorly 
2.7 times as broad as posteriorly.) 
Almost all of the specimens of A. ohesomanus 
in the collection have the carpocerite and 
scaphocerite equal in length; however, in a 
few they differ in length, with the scaphocerite 
being shorter. Intergrading series were found 
in different collections that bridged the dif- 
ference between a usual A. ohesomanus and 
the characters noted for this species. In this 
provisional species, however, the orbital hoods 
were confluent, without a trace of rostrum, 
rostral keel, or orbitorostral grooves. In A. 
ohesomanus there is usually a short rostrum 
with a short keel that is separated from the 
orbital hoods by a shallow concave region, but 
this characteristic is not constant, and in a few 
the rostrum is almost entirely lacking, the 
Carina has disappeared, and the orbital hoods 
are almost confluent. Our present interpreta- 
tion, therefore, because of the condition on the 
Saipan specimen, is that it merely shows an 
unusual variation or possibly a congenital 
defect. 
B. Those with simple dactyli on the posterior 
legs, but with the second carpal article of 
the second leg not more than twice the 
length of the first. 
1. A. malleodigitus (Bate). This species has 
been described twice, the original description 
by Bate on the basis of a fragmentary specimen, 
and a later redescription by de Man on a 
complete but smaller specimen. Unfortunately, 
the descriptions do not agree, and in the fol- 
lowing synopsis the changes by de Man are 
put in parentheses: First antennular article 
equal to the sum of the following ( second 
article 2-3 times length of visible portion of 
the first); spine of scaphocerite described as 
reaching to the end of the first antennular 
article, and shown as reaching to the middle of 
the third article (reaching from near the middle 
to the end of the second antennular article ) ; 
squamous portion of scaphocerite narrow, 
tapering, two-thirds length of lateral spine 
( squamous portion not tapering into spine ) ; 
carpocerite twice as long as scaphocerite, 
reaching beyond end of antennular peduncle 
( reaching from end of second antennular 
article to middle of third); fingers of small 
chela "about half” the length of the palm 
according to the description, but measuring 
