802 Professor E. B. Poulton on Mimetic Forms of 



fulvescens, each of the three mimicking a different Acrteine 

 species or form. 



(a) The most primitive sub-form is typical scmifulvesccns 

 as it occurs on Kilimanjaro, — represented in Plate XXI, 

 Fig. 3«. The whole of the fore-witigs, within the zigzag line 

 of the four spots, is bright fulvous, while the discal patch of 

 the hind-wings is pale yellowish. Thus is produced a con- 

 siderable superficial resemblance to Plancma quadrlcolor* 

 Rogenh., from the same mountain (Fig. 3). The zigzag 

 line of pale spots bordering the fulvous area of the fore- 

 wings represents the black margined fulvous band which 

 borders the deep rich brown of the Planema. The relati\'e 

 position of darker and lighter shades is the same, although 

 the inner half of the surface is much brighter in the mimic 

 than in the model. In the hind- wing the scmifulvesccns 

 form has a far larger pale area than the Planema, in which 

 the rich brown black-spotted triangular basal patch of the 

 under-side is reproduced upon the upper. The discal 

 band of the Planema, if smaller than the squarish patch 

 of the mimic, is brighter in tint, being white instead of 

 pale yellow. In one specimen of semifuhesecns from Kili- 

 manjaro the black ground colour has greatly encroached 

 upon the basal margin of the discal patch, leaving a pale 

 band which closely approximates to the form of the 

 marking in the Planema. 



(/3) The second sub-form of scmifulvesccns (Plate XXII, 

 Fig. 2«) is a splendid member of the group of mimics 

 clustered round Planema poggei (Fig. 2) as the central 

 model, — the combination of which so many members 

 have been described and figured by Mr. S. A. Neave 

 (Trans. Ent. Soc. 1906, p. 218: Plate X). It differs from 

 Oberthlir's form (a) in the restriction of the fulvous area 

 of the fore-wing to the neighbourhood of the zigzag line 

 of pale spots (compare Plate XXII, Fig. 2«, with XXI, 

 Fig. 3a). On the distal side of each spot as in scmi- 

 fulvesccns the ground colour of the wing is black ; but it 

 is also very dark brown, almost black, on the proximal side 

 of the innermost spot, except along the costa, where the 

 fulvous tint extends nearly to the base of the wing. The 

 discal patch of the hind-wing is moreover white instead of 



* This Planema, of wliicli a male and a female were presented by 

 Eev. K. St. Aubyn Rogers, was new to the Hope Collection, and is 

 unrepresented in the National Collection. It was kindly named 

 for me from a photograph by Prof. Chr. Aurivillius. 



