148 Transactions, — Zoology. 



cilia reddish-ochreous-brown, becoming whitish-ochreous at tips, on anal 

 angle dark grey. Hindwings whitish, spotted with grey except posteriorly, 

 apex reddish ; cilia whitish, with an obscure grey basal line. 



I am compelled to separate this species from C. excessana on account of 

 the structural difference in the antennae of the male ; otherwise I should 

 certainly have regarded it as a mere variety. It is constantly much 

 smaller than the average of that species, but C. excessana is occasionally 

 quite as small ; it is also much redder, and the hindwings are more 

 clearly whitish, but these points are quite indefinable, and would not be 

 sufficient for demarcation ; moreover I conceive that the diminished size and 

 the reddish colouring of both larva and imago are the direct effect of the 

 peculiar foodplant. But the antennas of the male are in 0. excessana 

 tolerably filiform, the joints hardly dilated, the ciliations not longer than the 

 width of the joints ; whilst in C. alopecana they are conspicuously serrate, 

 the joints almost triangular, and the ciliations much longer, fully twice the 

 greatest width of the joints. These differences are quite constant, and must 

 be regarded as sufficient. 



Larva 16-legged, moderate, cylindrical, somewhat tapering at both ends ; 

 variable, yellowish to ochreous-fuscous ; segmental incisions and some- 

 times sides ochreous-carmine ; spots large, pale, in some lights whitish ; 

 head and second segment ochreous-fuscous. Feeds in spun shoots and 

 between joined leaves of Phyllocladus alpirius (Coniferce), in January. Pupa 

 in the same position. 



I took two specimens in the forests on the Bealey Biver (2,100 feet) in 

 January, and at the same time found larvae feeding, from which I bred 

 three more specimens in February. 



CONCHYLIDIDiE. 



This form of the name, which is orthographically the more correct, 

 should be substituted for Conchylidce. 



Heterockossa, Meyr. 



The pectination of the lower median vein of the hindwings in this genus 

 is, so far as I can ascertain, confined to the female ; the male does not 

 possess any trace of it. I had originally supposed that this was due to 

 denudation in the case of the two or three male specimens which I possessed, 

 but having since acquired more material, I find it to be the normal structure. 

 I think however that the point is not less valuable for generic separation ; 

 in the female of Paramorpha, which is the nearest allied genus, this well- 

 developed pecten does not exist. 



Het. cryodana, n. sp. 



Minor, alis ant. albis, griseo-irroratis, strigula e basi sub costa breviore, 

 squamis paucis sparsis, interdum etiam striga disci media nigris ; post, 

 griseo-albidis. 



