50 
MICROLEPIDOPTERA OF NEW GUINEA 
clouded posteriorly except towards apex, with rather dark grey; cilia pale 
ochreous, greyish opposite apex and along costa posterioily. 
Tegumen narrow, strongly erect. Uncus narrow, broad, top rounded, 
with strong bristles below. Sooius small, pending. Gnathos slender, hook 
robust. Transtilla broad, membraneous. Valva narrowly elongate, cucullus 
narrowed, with blunt top, sacculus strong, ending in a curved point, x / 2 . 
Vinculum moderate, a small furca present. Aedoeagus short, clavate 
basally; cornuti, short stout thorns (Slide No. 481 D). 
Mist Camp, 1800 m, December 28, 1938. One specimen. 
Rhomboceros Meyrick, 1910 
Rhomboceros Meyrick, 1910, Proc. Linn. Soc. N.S. Wales, vol. 35, p. 180; Lepid. 
Cat., fasc. 10, p. 6, 1912. Gener. Ins., fasc. 149, p. 11, 1913. Fletcher, Mem. Agr. 
Ind." Ent., vol. 11, p. 195, 1929. Diakonoff, Zool. Meded. Mus. Leiden, vol. 21, 
pp. 194—196, figs 5 A— B, 7 B— C, 1939. 
Owing to the study of four more species of this genus the following 
particulars may be added to its definition. 
Head in male sometimes with a large tuft on vertex and another tuft 
on lower half of face, face excavate, in female head rather roughly scaled. 
Basal third of antenna in male thickened, with rough projecting scales 
above (not projecting beneath), in female normal. Palpus in male porrect, 
moderately long, roughish above and beneath, or rather smooth; with 
terminal segment short (but not concealed), or rather long (Vs to over V 2 ); 
palpus in female subascending, rather long, slender, little dilated, some- 
what roughish above and beneath towards apex, terminal segment moderate 
or short, obtuse. Fore wing with a costal fold in male, covered with an 
expansible pencil of scales above; or fore wing without fold, with a fan- 
shaped flattened patch of scales along base of costa below, projecting over 
wing edge; sometimes a large tuft of scales on base of dorsum abo\e. Hind 
wing with vein 2 from 2 / 3 , in female sometimes from 3 / 5 ; costa covered with 
long hairs above, projecting downward over the wing, oi costa normal. 
Thorax with a moderate posterior crest in male, without crest in female. 
Key to the known species of Rhomboceros 
1. Males 4 
Females 
2. Face white ® 
Face dark fuscous or bronze-brown 4 
3. Palpus and pectus ochrcous-orango barbata spec. nov. 
Palpus and pectus irrorated fuscous pulverulenta spec. nov. 
4. Ground colour lilac-violet, with violet shine iridescens spec. nov. 
Ground colour pale fuscous, not shining nodicomis Meyrick 
5. Fore wing with costa moderately curved anteriorly, straight posteriorly . . 
pulverulenta spec. nov. 
6 
Fore wing with costa strongly sinuate . 
