( ii ) 



described in the Proceedings for that year (p. xxi). These 

 specimens had been selected with great expenditure of time 

 and pains by Mr. Blandford and the late ]Mr. Osbert Salvin, 

 but the groups were now broken up, and the specimens 

 restored to their places in the systematic series. 



The first slide represented a large group of butterflies from 

 British Guiana, showing the strong development of black 

 pigment in the hindwings of many Heliconine& and Ithomiinse, 

 as well as in a species of Lycorea (Danainee), Stalachtis 

 {Erycinidee), and Dismorphia {Pierinse). The number of 

 individuals was probably as great as in any of the groups 

 shown by Mr. Blandford, and yet each was reproduced with 

 sufficient distinctness on the lantern-slide, to bear magni- 

 fication for purposes of demonstration on the screen. 



The insects were arranged on a background of grey paper in 

 order to be photographed. The most convenient arrangement 

 consists of a series of corked boards about 1 ft. x 1 ft. 3 in. 

 in area, sliding in grooves in a case, so that they cannot be 

 displaced in any position. The setting should of course be 

 flat, and the specimens as far as possible at one height. 



The slides represented (1) groups of Limenitls (Basilarchia) 

 archijjpics, taken at the same time and place with its model 

 Anosia 7;Ze.o^?^«ts, in various localities in Canada and the 

 United States ; (2) Chalcosid moths from Borneo with their 

 Pierine and Euplcoine models ; (3) Xylocopid bees from 

 Borneo and Mashonaland, with their dipterous mimics belong- 

 ing to the genus Jlyperechia ; (4) A large composite group, 

 captured by Mr. Guy A. K. Marshall, at Salisbury, Mashona- 

 land, in which numerous species of Coleoptera of various 

 families, of Aculeate Hymenoptera, of Hemiptera, two species 

 of Lepidoptera, and one of Diptera, all possessed Lycoid 

 colours, and a Lycoid pattern, the models consisting of several 

 species of Lycithv, from the same locality. Nearly the whole 

 of these species appeared to be pseudaposematic, the only 

 pi'obable mimics in the Batesian sense being the fly, and one 

 or two Longicorns ; (5) A group of European Vanessidx, 

 compared with (6) a group of five species, and (7) a pair of 

 species of Acraeinse, captured by Mr. Marshall on the veldt 

 at Salisbury in a single tlay, showed the striking resemblance 



