BY R. J. TILLYARD. 299 



characters. Radial formula usually either 3 + 1 + 1 + 1 + 2 = 8 

 (as in figure) or 3+1 + 1 + 3 = 8 (as in specimen figured by 

 Esben-Petersen, These Proceedings, 1914, xxxix., PI. Ixxiv., fig. 

 8); very rarely 2+1 + 1 + 1 + 1+2 = 8. Ilindwini/ with 5-6 

 branches of Rs, usually 5, the two false origins of Rs well-formed 

 but short; very little cloudiness on hind wing, usually only along 

 costa and proximal part of posterior mai-gin to Cujb, and a cloud 

 on Cuib itself. Fenestella usually fairly distinct, sometimes not 

 very clear. Lunules distinct, three in number, veiy rarely four. 

 Number of gradate cross-veins above Cuj, in forewing, 9-10 in 

 inner, 11-13 in outer series; in hindwing, 4 in inner, 10-11 in 

 outer. 



As regards Australian specimens, it may be given as a general 

 rule that the most northern forms are the smallest and palest, 

 the most southern forms the largest and darkest. McLachlan's 

 type, from Moreton Bay, is smaller than any specimen I have 

 examined. The specimen from Melbourne, examined by Mr. 

 Petersen, and determined as conspecific with McLachlan's type, 

 has an expanse of quite 18 mm.; while the expanse of the type- 

 specimen is given as "7 lines," i.e., just over 14 mm., which is 

 considerably smaller than any specimen of Drepanacra known to 

 me. I think, however, that the printed measurement is an error, 

 since the body-length is given as "3 lines," and the very care- 

 fully drawn figure shows the expanse to be quite thrice the body- 

 length. 



The following varieties, or forms, may be distinguished. 



a. — The type-form; ground-colour of forewings greyish-ochrenus, 

 subhyaline, with a few, scattered, black dots; hindwing with 

 ochreous pterostigma. 



This form is typical of S. Queensland and Ne\v South Wales; 

 Victorian specimens are, on the whole, slightly darker and more 

 distinctly marked, usually with a distinct row of black spots 

 along the inner gradate series. One Victorian specimen in Mi-. 

 Froggatt's collection has the forewings a rich brown, the hind- 

 wing shaded with brown. 



