MR. TRIMEN ON MIMETIC ANALOGIES AMONG AFRICAN BUTTERFLIES. 521 



EXPLANATION OF THE PLATES. 



The Plates partially illustrate the most striking cases of Mimicry among South-African 

 Butterflies, — Plate I. consisting chiefly of the species of Danaidce and Acrceidce that arc 

 the objects of imitation, and Plate II. of the imitating forms belonging to other families. 



Plate I. 



Fig. 1. Papilio Meriones, Felder, ? , from Mada- 

 gascar. 

 The black costal bar in the fore wings indicates 

 how the extreme disparity between the sexes of 

 the very closely allied Papilio Merope of the 

 African continent may have originated. 

 Fig. 2. Acrcea Aganice, Ilewitson, 6 , from D'Ur- 

 ban. Natal. 

 This species is mimicked by the following, a 

 member of the Family Nymphalidfe, viz. : — 

 Fig. 4. Panopea Tnrqmnia, Trimen, 6 , from 



D' Urban, Natal. 

 Fig. 3. Danais Echeria, StoU, 6 , from Knysna, 

 Cape Colony. 

 The type-form, prevalent in the Cape Colony, 

 but scarcer to the eastward of it, and rare in 

 Natal. 



Fig. 7. Danais Echeria, Stoll, var., $ , from D'Ur- 

 ban, Natal. 

 This variety prevails in Natal, almost to the 

 exclusion of the type-form. 



from 



Fig. G. Danais Niavius, Linn., var., J , 

 D'Urban, Natal. 

 A Southern form, differing from the Tropical 

 West-African type in the much larger white 

 space of its hind wings. 



VOL. XXVI. 



Plate II. 



Fig. 1. Papilio Merope, Cramer, c?, from Knysna, 

 Cape Colony. 



Fig. 3. Papilio Merope, Cramer, 1st form of $ , 

 from Knysna, Cape Colony. (P. Cenea, 

 Stoll.) 

 Mimics the type-form of Danais Echeria. 

 Fig. 4. Papilio Merope, Cramer, 1st form of 5 , 

 from D'Urban, Natal. (P. Cenea, Stoll., 

 var.) 

 Mimics the Natalian variety of Danais Echeria. 

 Fig. 7. Diadema mima, Trimen, n. sp., c^ , from 

 D'Urban, Natal. 

 Also mimics the prevalent variety of Danais 

 Echeria in Natal. 

 Fig. 2. Papilio Merope, Cramer, $ , variation, 

 from Tsomo River, Kaflraria. 

 Intermediate between the 1st form of $ (/'. 

 Cenea, Stoll.) and the 2nd form (P. Hippocoon, 

 Fab.), and indicative of the yet unstable cha- 

 racter of the polymorphic 2 Merope. 

 Fig. 6. Papilio Merope, Cramer, 2nd form of f , 

 from Graham's Town, Cape Colony. 

 (P. Hi/ipocoon, Fab., var.) 

 Mimics the Southern form of Danais yiavius, 

 and, like the latter, differs from the West- African 

 Hippocoon in the much larger wliite space of its 

 hind wings. 



4 c 



