BY R. J. TILLYARD. 6l 



with brown, as follows — on two or three of the cross-veins in 

 the cubital space, also at the origin of Rs, on the third and fifth 

 cross-veins beyond it, and on the radial brace; on the 4:th-6th 

 cross-veins in median space, and on the first four cross-veins in 

 the cubital space. A larger blotch above the posterior margin 

 just before half-way, crossing Cua and running up to M^; near 

 apex, several, small, cloudy patches. In hindwing, a cloudy 

 patch over ends of M and Cuj, extending as a faint smokiness 

 almost to apex. 



Hab. — Tennant's (Jreek, Central Australia. Taken in Novem- 

 ber, 1 906, by Mr. J. F. Field, to whom I dedicate the species. 



Type in Coll. Tillyard. Unique. 



A very distinct and peculiar little species. 



Genus Xanthol eon, n.g. 



Insect of very slender build. In forewing, Rs arises about 

 two cells' width distad from level of cubital fork, and is rather 

 irregular in form; ol)lique vein close to the fork (within one 

 cell's distance). No Banksian line present. The cells below 

 Cui -f- M., in forewing, and below Cuj in hindwing, are very 

 regularly arranged, and separated into oblique rows by numerous, 

 parallel sectors descending from the main vein. Hindwing 

 slightly longer than forewing Antennje long and slender, with 

 weak, elongated club. Legs of median length, slender; tarsi 

 with tirst joint a little longer than fifth, 2nd-4th very short; 

 spurs present, longer than first tarsal joint Abdomen slender. 



Genotype, X helmsi, n.sp. 



A very distinct and clearl}^ marked off genus, whose affinities 

 appear to be somewhat doubtful In the delicacy of its structure 

 it appears to hold about the same relationship to Distuleoii that 

 Froyyattisca does to Glenoleon. 



IS.Xantholkon helmsi, n.sp. (PI. v., fig. 12). 



Total length 24-5, alxlomen 17"5, forewing 29, hindwing 30mm. 

 Head pale yellowish all (jver, except for the black eyes. 

 Antennae yellowish, slender, 7 mm. long. 



