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night when the species was in greater abundance, and that 

 the lighter forms were those usually noticed by day. Mr, 

 Robson, of Hartlepool, who was present as a visitor, said 

 that black examples of Xylophasia monoglypha, Hufn., 

 {polyodon, L.), occurred with the normal form on some 

 nights, but not on others, and he considered that atmospheric 

 influences, when the insect is on the wing, enter largely as 

 a determinating factor into the question. Mr. C. G. Barrett 

 cited as a curious fact that, out of a large number of 

 Arctia caia, L., bred, seven of the variety with yellow 

 hind wings, had emerged on the same day {vide meeting, 

 November 26th, 1891 ; exhibit by Mr. J. A. Cooper, of 

 Leytonstone). Mr. Robson mentioned a similar instance ; 

 he said that from ten pupae of Vanessa antiopa, L., sent to 

 this country from Canada, nine imagines emerged directly 

 after reaching Liverpool, and four of these were the variety 

 without the blue marginal spots, and with broad yellow borders 

 running inwards. On the tenth pupa being opened it was 

 found that the butterfly contained therein was of the same 

 form (var. hygicea). Mr. J. A. Clark said that the proportion 

 of dark forms of D. fagella was fully equal to that of the 

 lighter ones in Epping Forest, and he did not look upon 

 the dark specimens as any particular variety. Mr. Weir 

 stated that he could not recollect any dark forms of this 

 species in his earlier collecting days. 



The President called upon Mr. Robson, and expressed 

 the pleasure of the meeting in seeing him present, and 

 the interest of the members in any notes or exhibitions 

 which he might contribute. Mr. Robson then handed round 

 a box of insects for the inspection of members, and drew 

 attention to a short series of Spilosoma mendica, Clerck., 

 one example, a female with cream-coloured fore-wings, was 

 bred at Hartlepool. He said that the species was com- 

 mon in Northumberland and Durham along the coast, and 

 was usually of the ordinary form ; there were, however, 

 some males of a colour intermediate between the English 

 and Irish forms. Mr. Barrett said that the particular variety 

 shown differed from the usual form in the same way as 

 northern specimens of vS. inenthastri, Esp., did from those 

 from southerly localities. Mr. Robson had also for exhibition 

 dark specimens of Sinerinthiis populi, L., from Aberdeen, and 

 light forms (female) bred from Hartlepool ; also two light 

 varieties of ZygcBna filipendulcE, L., from Mr. Harwood, of 

 Colchester. Mr. R. Ad kin stated that S. mendica was not 

 a common species in Scotland, and Mr. Tutt said that Mr. 



