191 DR. A. G. BtTLER ON LEPIDOFTEROITS INSECTS [Mar. 1, 



27. ACEJSA DOUBLEDAYI Guer. 



Wet. d 5 , Malvern, near D'Urban, Natal, 800 feet, 2nd to 

 4th March, 1897. 



Dry. <3 , Gadzima, 4200 feet, Umfuli Biver, Mashonaland, 

 llth August ; Gijima. 23rd August, 1895. 



It' the single male from Mashonaland represents the normal 

 dry-season phase, it only differs from that of the wet-season in its 

 inferior size, and would be indistinguishable from starved examples 

 obtained during the rains; both, however, differ very considerably 

 from the wet form of the scarcely distinct A. nero of Eastern Africa. 



28. ACRVEA ANACREON Trim. 



Dry-season form. Karkloof, 4200 feet, Natal, 20th February, 

 1897. 



An extraordinarily well- developed example showing nearly 

 double the usual expanse of wings. 



" Dry " and wet form. A. induna, Trim. Gijima, Mashonaland, 

 14th August ; Gadzima, 18th December, 1895. 



The so-called dry form of A. induna (because obtained in the 

 dry-season) is a starved and somewhat \\orn little male, which, in 

 my opinion, is only a belated wet form (provided that the heavy 

 black apex really is seasonal, as it is said to be in certain species 

 in the genus). The black apical patch in this example is slightly 

 reduced, as might be expected ; but Mr. Marshall has himself 

 admitted that in some of the species this black patch is a charac- 

 teristic of the wet season ; in any case it is certainly a varietal, 

 not specific, character, inasmuch as we have complete series of 

 intergrades between the extremes in several forms of Acrcea. 



29. ACE^EA ASEMA Hewits. 



Gadzima, Umfuli Eiver, 29th July, llth, 14th. and 24th August, 

 1895. 



Mr. Marshall considers this to be the dry form of the following, 

 of which he sends one curious example, said to be the intermediate 

 form ; it certainly looks like it, but I should like more conclusive 

 evidence than is afforded by one specimen which was obtained 

 almost at the same time (in the same month) as A. asema. 



30. ACR^EA YIOLARUM Boisd. 



" Intermediate form" Hartley Hills, Mashonaland, 27th July, 

 1895. 



31. ACR^A CALDARENA 



rf wet form, Salisbury, 31st May; $ $ dry form, Gadzima, 

 4th August and 20th September, 1895. 



It would seem that the seasonal forms of this species differ 

 chiefly in size, the dry form being smaller ; both phases agree in 

 the large black apical patch, proving that this is not an invariable 

 seasonal character, but by no means proving that it is not so in 

 most of the species which possess it. 

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