59 



consequence distinctly acute ; the left hind-wing of No. 4, 

 and the right hind-wing of No. 5 have the middle of their 

 outer margin slightly concave. The aberration in contour of 

 the wings does not seem to have caused any modification in • 

 the markings of the wings affected. 



No. 6, Lyccena icariis, Rott. — Another example of aberra- 

 tion in shape of one pair of wings unaccompanied by altera- 

 tion in the markings of those wings. 



No. 7. Tortrix piceana, L. — This specimen emerged from 

 the pupa with three wings only. The right hind-wing is 

 quite absent, and I cannot find any trace or vestige of any 

 such organ on this side of the specimen. I should mention 

 that all the legs are perfectly developed, and, with the excep- 

 tion of its being short of one hind-wing, I fail to find that 

 the insect is abnormal in any other respect. 



With regard to the probable cause of these interesting 

 abnormities I will not now venture to offer an opinion, but 

 when this subject was last before us I think that it was sug- 

 •gested that malformations of this kind were probably caused 

 by some injury to the larva. I am inclined to believe that 

 this will prove to be the true explanation of these misshapen 

 specimens, but the fact can only be clearly and convincingly 

 demonstrated by careful experiment. I must add, however, 

 that, at the present moment, I do not quite see how such a 

 line of investigation can be satisfactorily conducted. 



Mr. H. Williams exhibited a pupa of Colzas hyale, L., 

 obtained from one of the larvae shown by him at the last 

 meeting. 



Mr. Tugvvell exhibited a series of DianthcEcia luteago, Hb., 

 var. barrettii, Dbl., some of the specimens having been bred 

 by him, and others captured at Howth. 



Mr. R. Adkin exhibited Zygcena jilipendulcB, L., from 

 north-east Essex, showing gradations of colour intermediate 

 between the red and yellow forms. Peronea rufana, Schiff, 

 bred from Myrica gale, and P. hastiana, L., bred from sallow 

 from Sutherlandshire, the latter including a number of very 

 distinct forms. 



Mr. C. G. Barrett referred to one of the specimens of P. 

 hastiana, which was deeply suffused with a peculiar bluish- 

 grey colour, and said he thought it was the first he had seen 

 of this variety. 



Mr. C. G. Barrett exhibited unicolorous dark examples of 

 Acronycta leporina, L., reared by Mr. Joseph Collings of 

 Warrington, and a white variety of Triphcena pronuba, L., 

 taken by Mr. W. Holland at Swansea. 



