BY E. MEYRICK. 569 



October to January, common in swampy places. The sexual 

 difference in marking is an unusual character in this gi-oup. 



30. Thudaca, Walk. 



Head with dense erect hairs on crown, face smooth, sometimes 

 with deep cavity in $ ; ocelli present ; tongue well-developed. 

 Antennae 4, in ^ serrate, very shortly ciliated {^, basal joint 

 without pecten. Labial palpi long or rather long, somewhat 

 curved, ascending, with appressed scales, second joint more or less 

 long, in ^ sometimes flatly compressed, terminal joint i to |of 

 second, more or less pointed, or in $ sometimes minute, aborted. 

 Maxillary palpi rudimentary. Posterior tibiae clothed with long 

 hairs. Fore wings with vein 1 furcate, 7 and 8 stalked, 7 to hind- 

 margin, 11 from before middle. Hindwings 1, elongate-ovate, 

 cilia ^-| ; veins 3 and 4 from a point or closely approximated at 

 base. 



A curious and interesting genus, apparently endemic, especially 

 characteristic of Western Australia. It is not very close to any 

 of its allies, but might be a development of Timaea. The singular 

 conformation of the forehead and labial palpi in the ^ of some 

 species is noticed under T. crypsidesma ; these species so closely 

 approach others in every other character, that there can be no 

 question of generic separation, but the case is a highly peculiar 

 one, and requires further investigation. 



1. Forewings with white median longitudinal 



streak from base 2. 



Forewings without white median longi- 

 tudinal streak from base 7. 



2. Median streak entire, reaching hindmargin 153. trabeata. 

 Median streak interi'upted posteriorly ... 3. 



3. Costal or subcostal white streak inter- 



rupted in middle 4 . 



Costal or subcostal white streak not in- 

 terrupted 6. 



