61 



three examples captured in a timber-yard in 1921 ; the dipterons 

 Plu/socepJiala riifipes, bred from a nest of the bee Boiiibns Incorinn, 

 and C/n/socJdaiin/s citjuea taken on a Convolvulus flower at Seer 

 Green, Bucks ; the beetles Deleaster dichroiis from Hale End at 

 light, MeiianoniiH niclinnns on an old log, near Monk Wood, Epping, 

 Tiichiiis fasciatKs boxed on a flower of Heracleniii, gi/ianteii)». in 

 Stepney, and others. 



Major Cottam exhibited a series of Psilnra )iio)utcha varying from 

 almost snowy white to the smoky black var, erimita, and several 

 series of Bryopliila intiralix from various districts. 



Mr. A. W. Mera exhibited an example of Pieris brasaicac J in 

 which a dusting of black scales joined up the two black spots on 

 the forewing, bred in May, 1921 ; an asymmetrical Fi/rameis 

 atalanta with bleached wing, bred from a Northumberland larva 

 where the insect has been particularly abundant this year; and 

 suffused forms of Pittiiiicia phlaeas taken and bred in August, with 

 typical specimens of the May emergence, all from Crawley Down, 

 Sussex, 1921 ; and pointed out that the suffused forms of A', /i/daeas 

 seem to predominate in the August emergence. 



Mr. Percy M. Bright exhibited a grand series of upper and 

 underside aberrations of Melitaea athalia ; and a series of male 

 Agriadea coridoii upperside, including many very remarkable 

 aberrations. 



Mr. Harold B. Williams exhibited a drawer of linniicia jdilaeas, 

 the result of several seasons' special attention to the species, 

 including series of abs. radiata, ubliterata, and other forms. Special 

 attention was directed to the following : — 



1. ab. alba, Tutt. — Two specimens of this form were shown, 

 together with abs. sclunidtii and intermedia, and a long series of 

 specimens having portions of one or more wings showino- the 

 coloration of one or other of these forms. These specimens are 

 regarded by Tutt as pathological and as distinct from ab. cdha, etc. 

 Microscopical examination of the entire series by Dr. E. A. Cockayne 

 has shown the colour variation to be due to a scale defect, which is 

 identical in its nature in every specimen. It is probable that this 

 defect is hereditary ; 7 specimens were exhibited which were 

 bred from one Wimbledon J (normal). 



2. ab. eiens. Fb. — This form and ab. sufiisa, Tutt, appear to 

 occur in Britain only in abnormally hot summers, when the 

 intermediate forms {initia, Tutt, etc.) are also more abundant than 

 usual. 



