Alpheid Shrimp, X: Fiji, Tonga, Samoa — Banner and Banner 
169 
chela are "somewhat shorter” than the palm; 
the second carpal article of the second leg is 
twice as long as the first. 
This may be a distinct species, but because 
the only characteristic that is definitely stated 
is the relative length of the second carpal 
article, and as this relative length lies merely 
on the extreme margin of the normal curve 
for the supposed parent species (see Fig. 15), 
the subspecies must be regarded as indistin- 
guishable from A. obesomanus. 
If later study shows this to be a distinct 
species or subspecies the name will have to 
be changed, as Coutiere (1905:886) has 
already remarked, because the name A. japoni- 
Fig. 17. Obesomanus group; proportions of the 
merus of the third leg in three species. Ordinate: the 
length of the merus of the third leg divided by the 
breadth. Abcissa: number of specimens. 
cus has already been used by Miers (1879:53) 
for a species in the Edwardsii group. 
3. A. micro stylus (Bate), when compared 
with A. obesomanus, appears to have slightly 
shorter and thicker second articles in the 
antennular peduncle 1.2 times the length of 
the first, and 2 times as long as broad. Most 
important, the end of the scaphocerite and 
carpocerite reach beyond the end of the 
antennular peduncle, and the squamous portion 
of the scaphocerite reaches almost to the end 
of the third article; the sculpturing of the large 
chela is deep and pronounced, and the palm 
of the small chela varies from 1.5 to 2.1 times 
the length of the fingers; the first two carpal 
articles of the second legs bear the ratio of 
1:3, the third legs are similar to those of 
A. obesomanus and vary from 3-0 to 4 times 
as long as broad. There seems no doubt that 
this species is valid and distinct from A . 
obesomanus, as shown by the differences in the 
antennal peduncle, small chela, and second legs; 
it is probable that the differences in the large 
chela are constant and discernable as "Well. 
4. A. microstylus var? de Man. This possible 
variety was separated by de Man from the 
parent species solely on the basis of the thinner 
second segment of the second legs, 9-14 
Fig. 18. Obesomanus group; proportions of the 
telson in three species. Ordinate: the length of the 
telson divided by the breadth of the posterior portion. 
Abcissa: number of specimens. 
