The present paper is the fourth part of the report on the Microlepidoptera 
of the Third Archbold Expedition to the Netherlands New Guinea, 
1938 — 1939. The previous parts were published in no. 1, pp. 1 — 167, 1952, 
no. 3, pp. 1—167, 1953, and no. 4, pp. 1—164, 1954, of vol. XL of these 
Verhandelingen. 
In the present part are given description and records of the Gelechiidae, 
Cosmopterygidae, Scaeosophidae, Xyloryctidae, Stenomidae, Oecophori- 
dae, Orneodidae and Aegeriidae. 15 genera, 119 species and 7 subspecies 
are described as new. 
GELECHIIDAE 
This extensive family is rather sparsely represented in the present 
collection, as the greater percentage is formed by the species of two genera 
only, viz., Crocanthes and Lecithocera. The first genus is almost exclusively 
confined to Australia and New Guinea and has acquired in each country 
rich, and independent development. From this we may conclude that, if 
Crocanthes is of Australian origin, and invaded the Papuan region from 
there, this must have taken place not very recently. 
The second genus, Lecithocera, has an almost cosmopolitan distribution, 
but is possibly of Indian origin, from which country it might have invaded 
New Guinea (and also Australia). 
Lecithocera is a typical inhabitant of forests, where it flies in shadowy 
places in the dark, as well as in the daytime. Although nineteen species 
are recorded below, all of them apparently new, we would expect a still 
larger number of species from the boundles region of forests of Central 
New Guinea, which have been explored by the Expedition, and especially 
from the Moss Forest Camp. The explanation of this limited number of 
species collected probably lays in the fact that semi-diurnal species are 
less easily attracted by fight traps — by which method the greater part 
of the present material has been collected — than true nocturnal species. 
Further collecting will without doubt add many more species of the 
genus to the present fist. 
Key to the Papuan genera of the Gelechiidae 
1. Fore wing with vein 7 to termen or apex, or 7 or 8 or 9 absent ... 2 
Fore wing with vein 7 to costa, 7-9 present J ) 21 
2. Antenna 1 or over 1 3 
Antenna not over 5 / 6 9 
3. Hind wing with veins 3 and 4 remote 4 
Hind wing with veins 3 and 4 connate, stalked or coincident. . . . 
*) Only in Merocrates vein 9 absent. 
