( xiii ) 



nus. But this moth, in all and every structural particular, agrees with 

 Maia. In the similarly-coloured antennae we have the permanent character 

 oi Heinileuca si\\\ persistent. But the wings have become dusty grey or 

 whitish, an undefined colour borrowed perhaps from the arid plains of 

 Utah, where the moth lives. Dr. Packard suggests this reason for its 

 peculiar colour, but, having compared the mouth-parts, feet and head, and 

 neuration, I can find no reason for separating the moth under a new genus. 

 It must be called Hemileuca tricolor. The red tuftings are persistent on 

 the body also, as well as the antennal peculiarity. In another form from 

 Arizona there is a wider divergence from the Maia type. The red tuftings 

 still appear in this species, which is called Argyratiges Neumoegeni. But 

 the antennae are different in colour, and the head is no longer so sunken as 

 in Maia. The ornamentation is modified, and departs more widely from 

 the type of Maia than any of the other forms here mentioned. While there 

 is every probability that in H. tricolor we have to do with a bleached form, 

 belonging structurally to the type of Maia, we may consider Neumcegeni to 

 be distinct enough to form a different genus. In classifying it as a species 

 of EuleucophcBus, its describer was evidently led by its white colour to 

 associate it with tricolor." 



Mr. W. L. Distant said that this once rare moth was now common since 

 its larva had been discovered ; a correspondent of his had bred it commonly, 

 and he hoped that it would become acclimatized in this country; the eggs 

 which had been sent to him had hatched before the oak-leaves appeared, 

 but he hoped to retard their development so as to obviate this difficulty 

 next year. 



Paper read. 



Mr. A. G. Butler communicated a paper, " On the Lepidopterous genus 

 Cocytia," remarking on the two already known species (C. Durvillii, Boisd., 

 and C. chlorosoma, Butl.), and describing a new species [C. Veitchii) some- 

 what intermediate in character between them. 



Neiv Part of ' Transactions.'' 

 Part I. of the ' Transactions' for 1884 was on the table. 



June 14, 1884. 



J. W. Dunning, Esq., M.A., F.L.S., &c,, President, in the chair. 



Donations to the Library were announced, and thanks voted to the 

 respective donors. 



