80 
MICROLEPIDOPTERA OF NEW GUINEA 
Valva elongate, with an ear-shaped, vertical fold in disc, cucullus small, 
elongate, with rounded top, sacculus angularly bent towards base. 
Aedoeagus pistol-shaped, top obliquely truncate, eornuti a sheaf of long 
spines. Corethrogyne very large, mostly dorso-lateral, sometimes ventro- 
lateral: two brushes of long scales. The scales vary in shape specifically, 
from long-linear, to rather broad clavate. We regard the first type as the 
more specialised one. Ostium narrow, limen rectangularly bent. Colliculum 
small. Cesturn mostly narrow, tortuous or coiled, terminal fold often very 
broad, variably built and forming a good specific characteristic. Ductus 
bursae rather short, bursa mostly large, erect-ovoid, signum slender, long, 
curved, mostly serrate. Ovipositor small. 
Closely allied to Chionothremma, distinct by roughly scaled fore wing, 
often ciliated costa, rough palpus, modest colouring and dorsal corethro- 
gyne. Piliscophora Diakonoff, erected on account of the presence of a 
large frontal tuft, must be sunk as a synonym, as the scaling of the head is 
rather variable throughout the genus and is not sufficient for the separation 
of this species under a new generic name. The distribution is Papuan, 
except for a number of stragglers (see above, p. 37). The species are 
considerably varying and not easy of discrimination. The genitalia in the 
two sexes and the shape of the corethrogyne-scales in the female render 
good characteristics for their separation. 
Key to the Papuan species of Isotenes 
Males 
1. Vertex with a large flattened tuft, projecting over face, crobylota Meyrick 
Not thus 2 
2. Fore wing with a complete straight blackish transverse fascia 
melancalymma spec. nov. 
Fore wing with transverse fascia not thus 3 
3. Fore wing with transverse fascia not strongly dilated below middle, almost or 
entirely interrupted above middle pudens spec. nov. 
Fore wing with transverse fascia strongly dilated below middle .... 4 
4. Fore wing with transverse fascia deep ferruginous, suffused, formed by an 
erect -triangular costal spot and an oblique streak below middle of wing . . 
mesonephela spec. nov. 
Fore wing with transverse fascia not thus 5 
5. Fore wing with an erect-triangular ferruginous spot on 2 / s of costa, merging 
in ferruginous suffusion on middle third of dorsum which reaches halfway 
across wing rhodosphen spec. nov. 
Fore wing with markings fuscous-grey and blackish, without ferruginous; no 
spot on a / 5 of costa marmorata spec. nov. 
Females 
1. Fore wing with basal half or basal third suffused with dark fuscous-grey or 
dark grey, only centre of base sometimes lighter 2 
Fore wing sometimes with a broad triangular suffused central fascia, but 
with base never darkly suffused 3 
2. Very large species: 40 mm (female) megalea spec. nov. 
Species of moderate size: 26—28 mm (female). . . mesonephela spec. nov. 
