135 



and 50% black (42% male and 58% female). It will be noted that 

 this was a very symmetrical brood, both in regard to the numbers 

 of typical and black imagines and the relative proportion of sexes in 

 each. 



H brood. A black male D was paired with a black female A. B.C. 

 and in 1913 produced 29% typical (53% male and 47% female) and 

 71% black (54% male and 46% female), the typical strain in D brood, 

 as might be expected, not being overcome in this generation. 



J brood. A typical male D was paired with a black female 

 A.B.C. and in 1913 prodaced 62% typical (40% male and 60% 

 female) and 38% black (40% male and 60% female), showing that 

 the typical strain when reintroduced at once asserted itself. 



K brood. A black male H was paired with a black female H, 

 and in 1914 prodaced a wholly black brood (47% male and 53% 

 female), the typical characters thus being eliminated in the third 

 generation of breeding black with black. 



M brood. A black male J was paired with a black female G, and 

 in 1914 produced 29% typical (17% male and 83% female) and 71% 

 black (29% male and 80% female), the introduction of the typical 

 element in the second generation thus continuing to assert itself. 



Both of the 1914 broods were beginning to show signs of weak- 

 ness, and the experiments were therefore not continued further. 



Mr. F. W. Frohawk exhibited — 



1. Lycaena arion. A long series of 44 males and 44 females from 

 Cornwall, showing the variation this species is subject to as regards 

 the markings, ranging from spotless males to heavily spotted males, 

 equalling those (with spots) of normal females in size. Females with 

 spots similar to normal males and a gradual increase in the spots 

 to large club-shaped markings, the spots also ranging from five to 

 ten in number in the forewing. 



The spotless form does not occur in the female. 



Also a series of dwarf examples of both sexes, which occur yearly 

 in the Cornish locality. These are much duller in colour, in the 

 males all markings are pale and somewhat indistinct. The females 

 are generally of dusky appearance. 



2. A fine variety of Gonepteryx rhamni, similar in colour to the 

 species G. deopatra. The specimen was captured at Aldeburgh, 

 Suffolk, August, 1896. 



Mr. C. P. Pickett exhibited very long series of Ayriades coridon 

 from Hertfordshire, taken mainly in August, 1915, as follows: — 

 1. Sixty-six ab. loystonensis, asymmetrical gynandromorph 



