Curvrox.—Some New Zealand Amphipoda. 273 
species have been described by Geoffrey Smith. Several fresh-water 
species of Hya are known from South America, and one that I 
Chiltonia capensis, which has no palp on the first maxilla and has the 
third uropod single-jointed, but differs in having the two gnathopods alike 
in both sexes—thus requiring another modification of the characters of 
the genus. | 
The presence of very similar species in fresh and brackish waters in 
New Zealand, Australia, South America, and South Africa is important 
from a zoogeographieal standpoint, and it is desirable that a careful 
comparison of the species in question should be made. 
Genus PARALEPTAMPHOPUS. 
Range in Otago and named Pherusa caeruleus. In 1893 Della Valle had 
placed the first species under Acanthonostoma, and had stated that the 
Second species was very close to and perhaps identical with the first. 
I gave some details as to the distribution of the two species in 1909 
to a large extent intermediate both as regards structure and mode of 
life. It will be best to give the facts under each “species” separately. 
Paraleptamphopus caeruleus (G. M. Thomson). - 
Paraleptamphopus caeruleus Chilton, 19098, p. 54 (with synonyms). 
This species is now known to be widely spread over the southern 
portions of Otago and Southland, It has been recorded from Swampy 
Hill (near Dunedin), from the Old Man Range, from the neighbourhood 
Paracalliope fluviatilis does, though this species was not found by me in the 
same ditches. With P. caeruleus there was, however, the other species, 
P. subterraneus, but it was usually found a little deeper down, either on the 
surface of the mud or actually in the mud. Р. caeruleus is slightly smaller 
than P. subterraneus, and can readily be distinguished by its dark-blue 
colour. Most of the specimens are so darkly coloured that they appear 
black, but some are paler, especially on the appendages. 
The differences in structure from some of the forms of P. subterraneus are 
few and unimportant. The one that seems most constant is in the telson, 
