16 



the change is not in this species due to the direct influence 

 of environmental conditions. This result has also been re- 

 corded by Mr. Marshall (1, c). 



Nineteen butterflies showing injuries to the wings, probably 

 caused by the attacks of enemies. 



Five butterflies captured on the same day, Sept. 28, 1900, 

 including 3 similar species of Acraca and i Lycaenid with 

 an Acraea-Iike under side. 



The Lycaenid Alacna nyassa and the Hesperid Cydopides 

 willemi with a somewhat similar under side, captured on the 

 same day, Feb. 23, 1901 ; and a similar pair captured 

 March 3, 1901. 



A dark-winged fly and Zygaenid moth (Dec, 1900), 

 mimetic of the large group of black dark-winged Aculeate 

 Hymenoptera. 



Three Ichneumonids and 2 Longicorns (1900, 1901) form 

 part of an interesting group of black insects with the anterior 

 parts of an ochreous or reddish colour. An Aculeate and 

 a sesiid moth (1900), with the same general type of colouring, 

 aff"ord beautiful examples of modal and mimic. Four Ichneu- 

 monids (1900) constitute a very characteristically coloured 

 group of black-barred ochreous insects mimicked in the most 

 perfect manner by a Reduviid bug of a new species. Two 

 other Reduviids entered respectively the large group of which 

 the models are many species of black Aculeates, and the 

 characteristic group formed round the Lycid beetles. 



A beautiful group of 4 black Aculeates with yellow- or 

 orange-tipped abdomen from Umtali, Mashonaland (1900), 

 are beautifully mimicked by a sesiid moth from the same 

 locality : 2 specimens of the latter were presented. Three 

 specimens of Acraea encedon, 2 of a Lycaenid {CatocJirysops 

 pccidiaris)^ and 2 of a rare Hesperid {Abantis iettensis), all 

 from Umtali (1900). The two latter species show probable 

 incipient mimicry of the Acraeine type. 



A most interesting group of insects was captured together 

 on a plajit at Salisbury on Feb. 17, 1901. Four specimens of 

 black ants were the models mimicked hy a Locustid, Myrmc- 



