NIPHARGUS PHILIPPENSIS, A NEW SPECIES OF AM- 
PHIPOD FROM THE UNDERGROUND WATERS OF 
THE PHILIPPINE ISLANDS 
By Chas. Chilton 
Professor of Biology, Canterbury College, New Zealand 
THREE PLATES 
For the opportunity of examining the interesting amphipod 
described in this paper I am indebted to Prof. C. F. Baker, of 
the College of Agriculture, Los Banos, Philippine Islands. By 
a fortunate coincidence the specimens forwarded by Professor 
Baker arrived just at the time when I was examining a new 
species of Niphargus from Chilka Lake, India; for, though dif- 
ferent in several characters, the Philippine species is evidently 
closely related to the one from Chilka Lake. Professor Baker 
says that there are many subterranean drainage streams in the 
Philippine Islands, and wells frequently tap such streams; but 
near Los Banos the geological formation is all volcanic, and the 
waters usually emerge hot. He had examined several wells 
for amphipods without success, but recently Mr. S. Lantican, 
one of the students in zoology, found a well with moving cool 
water in the bottom and from this obtained the amphipods that 
were submitted to me. So far as is known, this is the first 
discovery of underground Crustacea in the Philippine Archipel- 
ago. From the statements made below it will be seen that 
the species differs from the description of the genus Niphargus 
given by Stebbing(4) in one or two points, in which, however, 
it agrees with the Chilka Lake species. The majority of the 
other characters are, nevertheless, so close to those of European 
species of Niphargus that I prefer to leave the species in the 
meantime under that genus. 
NIPHARGUS PHILIPPENSIS sp. nov. 
Specific diagnosis . — Body long and narrow, side plates 1 to 4 
shallower than their respective segments. Pleon segments 1 
to 3 with the posterolateral corners rounded and bearing short 
setules in slight indentations. Eyes wanting. First antenna 
nearly as long as the body; second joint about as long as the 
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