FAUNA OF THE MONTE BELLO ISLANDS. 645 
7. HoLocHILA HEATHII AERATA, subsp. n. 
This is a common Monte Bello form of H. heathii Cox. It is 
somewhat smaller, and the male shows a bronze rather than 
a purple sheen upon the upper surface of the wings, and is 
of generally darker coloration. In the female, the blue on the 
upper surface of the fore wings is much reduced, in some examples 
being confined to the base of “the interspace between the first and 
second veins. Both sexes have six very distinct marginal spots 
upon the lower surface of the fore and hind wings, in this 
respect resembling the type and differing from examples from 
the south-west and central parts of Western Australia, in which 
these spots are generally indistinct and sometimes absent. 
8. OXYTOXIA ARGENTEO-ORNATUS Hew. 
A large series, mostly from Hermite. 
Heterocera. 
It is by no means sure that the majority of species in the 
following list are not accidental visitors to the islands. By far 
the greater number of the Noctuze were taken upon sugar on 
one or two evenings, notably June 20th and from June the 29th 
to the first few days of July, 1912. Though sugar was applied 
almost every evening throughout our three months’ visit, yet it 
was only upon these few occasions that moths were taken. The 
nights in question were warm and still, following upon periods of 
strong easterly and south-easterly winds, which had blown for 
several daysin succession. It would not be surprising that winds 
of this nature, which several times enveloped the islandsin clouds 
of dust from the deserts of the mainland, should bring with them 
winged insects capable of fairly prolonged flight. There are, 
however, several forms which are apparently new, two of which 
are described here. Other apparently new species require 
comparison with type-specimens in Australia. As the N.W. 
Australian fauna is at present but little known, it would be 
unsafe to base any zoo-geographical conclusions upon insects so 
easily transported. 
1. AMSACTA MARGINATA Donov. 
Three examples, similar to specimens in the British Museum 
from the Sherlock River district, including a yellow-bodied 
aberration, which is also identical in every respect. In the red- 
bodied specimens, the black spots on the margins of the hind 
wings are much reduced, whereas in the yellow-bodied specimen 
they are very prominent. 
2. UYETHEISA PULCHELLOIDES Hainps. 
Identical with specimens from Port Darwin and Baudin 
Island. 
