BV E. MRYRICK. 573 



near base. Legs dark fuscous, middle tibise orange, posterior pair 

 whitish-ochreous. Forewings elongate-oblong, costa gently arched, 

 apex roundpointed, hind margin slightly sinuate, oblique ; snow- 

 white ; markings bright orange ; costal edge blackish near base ; 

 a moderate streak immediately beneath costa from base to costa 

 before apex ; a subdorsal streak, black-edged above, fi'om base to 

 anal angle ; two black-edged straight transverse streaks, first from 

 subcostal streak at | to above middle of subdorsal but not neai'ly 

 reaching it, suffusedly barred with blackish-grey above middle, 

 second from extremity of subcostal to subdorsal before extremity, 

 suffused with blackish-grey towards costa and on a bar above 

 lower end ; a blackish line along hindmargin : cilia light ochreous- 

 yellowish, basal half orange, with a cloudy dark grey bar above 

 apex. Hindwings grey ; cilia pale whitish-yellowish. 



Melbourne, Victoria ; Port Lincoln, South Australia ; in 

 November, two specimens. The remarkable structure of the 

 frontal cavity in this and the next two species, with the accessory 

 modification of the palpi, is highly peculiar, and I know nothing 

 quite analogous to it in other families ; it seems to me very 

 sur)n*ising that so profound a modification of structure (for the 

 cavity appears to occupy the greater portion of the head), without 

 connecting links, should distinguish these species from others so 

 closely allied to them in all other respects that, in the case of T. 

 mimodora which possesses this structure and T. ohliquella which 

 does not, T am hardly able to detect any difference except in this 

 particular. From the nature of the flocculent substance in the 

 cavity, I suppose it to be a scent-producing organ. If the lateral 

 tufts of the abdomen are also for the same purpose, the provision 

 would seem to be profuse. 



145. Thud, haplonota, n.sp. 



^9. 19-20 mm. Head bright orange, face whitish-orange, in ,J 

 with cavity as in T. cryjjsidesma. Palpi light orange ; second 

 joint in ^ rather dilated and flattened, hardly reaching base of 

 antennae, appressed to face, with long flocculent hairs on inner side, 

 in 2 normal, rather exceeding base of antenuse, apex infuscated. 



