352 ME. A. a. BUTLER ON THE 



cies ; but as this is not the case in any other instance with which 

 I am acquainted, I do not think it at all probable. 



Subfamily THYEETIN^. 



Antennae always more or less strongly pectinated, more strongly 

 in the males than in the females, neuration and coloration fre- 

 quently partaking of the character of the preceding subfamily ; 

 aual segment of the males terminally slightly pilose. 



Genus Hydkusa, Walker. 



This genus is most nearly allied to Syntomis, the antennae of 

 the males in the typical group being armed with rather short 

 pectinations, aud the females with mere serrations. 



1. Hydrusa cingulata, n. sp. 



Nearly allied to H. annulnta, but smaller, the head narrower, of a 

 brighter orange colour, the crest more narrowly banded with orange ; 

 primaries with the spot at end of cell smaller, narrower than long, 

 the subapical spot bifid, much more elongated, the discal bifid spot 

 subtriangular, no pale tawny dot connecting the discal and subapica 

 spots; secondaries with the base more narrowly orange (the orange 

 area only occupying the basal third of the wing), discal oval spot 

 smaller, less distinctly divided : body below brighter in colom', abdo- 

 men banded with orange down to the anus ; wings below nearly as 

 above : expanse of wings 37 millims. 



Moreton Bay {Gibbons). Type, B.M. 



The type of S. annulata is in the Banksian cabinet, and agrees 

 wdth an example which we have from Sidney. 



"We have two examples, registered " N. E. coast of Australia," 

 which seem to be referable to Tl. cingulata. 



2. H. HUMERALIS, U. Sp. 



Allied to the preceding species, but smaller ; head orange, with a furcate 

 spot on the crest ; thorax blackish, tegulse orange ; abdomen orange, 

 the segments edged with black ; primaries as in the preceding spe- 

 cies; secondaries with the basal half pale orange, apical half black- 

 brown, a large bifid subapical pale orange spot scarcely separated from 

 the basal area : wings below as above ; expanse 29 millims. 



N. Australia [Elsey). Type, B.M, 



3. H. NiGuicEPS, n. sp. 



Nearly allied to H. annulata, same size and general appearance; head 

 entirely black above, frons orange ; thorax black, abdomen black nar- 

 rowly banded with orange : wings black, sj)ottcd with pale tawny 



