HOUN EXPEDITION—MAMMALIA. 
11 
(2) Hapalotis apicalis^ Gould. The white-tipped jerboa-rat. 
This is evidently a comparatively rare form, and is considerably larger in size 
than H. )nitcheUi. 
I am indebted to Mr. Gillen for an adult male and to Mr. Field for an 
immature male specimen. Both of them came from Alice Springs. 
(3) Hapalotis cervinus, Gould. Fawn-coloured jerboa-rat. 
We did not secure any specimen of this during the Expedition, nor were any 
to be found some months later during February, 1895, when I again visited 
Charlotte Waters; but Mr. Byrne kindly sent me down three specimens secured 
in June and July, 1895, when they had for some reason become plentiful, 
following upon a good rain season. Mr. Byrne, writing from Charlotte Waters 
in July, I’cferring to this species, says:—“ The jerboa-like rodents are coming from 
the eastwards, and they almost amount to a plague here,” and, writing again in 
September, says that they have again become so scarce that the blacks liave 
dithculty in securing a specimen. 
This migration of I’odents in Centi-al Australia appears to be dependent 
entirely upon the occurrence of good seasons, and with the advent of these is not 
an uncommon occurrence. 
Order Chiroptera. 
Family Nycterid.e. 
(1) Megadenna gigas, Dobson. 
Only a single specimen of this was obtained at Alice Springs from a cave in 
the McDonnell Ranges; subsequently, through the kindness of Mr. F. J. Gillen, 
I obtained two more. At times they are met with in abundance in this locality, 
and are evidently confined to the central part of the continent. 
Habitat. —Central Queensland and Alice Springs. 
(2) Nyctophilus ti/noriensis, Geoffrey. 
This is the commonest species of bat, being met with everywhere in the 
central district. 
Habitat. —-The Australian region. 
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