1896.] rilOM NYASA-LANU. 835 



one male : it is the dry-season form of T. atirvjineus, and until 

 this collection came to hand was only represented by the typical 

 male example from Kilima-njaro in the Museum series ; nor have 

 I seen it iu any other collection. 



91. Teeacolus opalbsobns. 



5 . Teracolus opalescens, Butler, Ent. Month. Mag. xxiii. p. 30 

 (1886) ; c? . P. Z. S. 1896, p. 125. 



6 • Dry-season form. 



On the upper surface this only differs from the male of the 

 wet-season form in the absence of the black marginal spots to the 

 secondaries ; on tl>e under surface, liowever, it differs in liaving 

 the apical area and costal margin of the priinariijs and whole 

 surface of secondaries flesh-pink, tinted on the costal borders and 

 internervular folds with ochreoiis ; the disc of the secondaries 

 crossed by a series of brown dots. Expanse of wings 51 raillim. 



Bangara, W. coast of Lake Nyasa, August 18th, 1895. "If 

 once missed, is exceedingly difEcult to take " {R. C). 



The arrival of this example is particularly interesting to me, 

 for it shows that my belief in the local constancy of some of the 

 named forms of the T. eris group is, so far, borne out, the seasonal 

 forms of this Eastern and Central African type being both easily 

 separable from the more southern examples. 



The type of T. eris was obtained at Ambukohl, in Lower Nubia, 

 and is probably the true male of my T. abt/ssinicivs, of which we 

 only possess females : the figure agrees most closely with a male 

 (wet-season form) received from Kilima-njaro, the orange apical 

 spots on the primaries being short, the outer edge of the upper 

 ])ortion of the white area, beyond the cell, less oblique than in the 

 southern forms, or than in T. ojjalesceiis, and the black costal belt 

 of the secondaries extending on the disc to below the second sub- 

 costal branch ; it, however, differs in having a small white spot 

 near centre of outer margin of primaries, a character which may 

 be variable. The southern forms are certainly not typical 3'. eris ; 

 nor can T. johnstoni be correctly called (.he dry-season form of the 

 Natal examples presented to us by Mr. E. 0. Buxton, inasmuch as 

 the latter have the under surface of the wings pink, and must there- 

 fore themselves be the dry-season form of Mr. Trimen's T. eris 

 (of which he says : " Underside — ■ Whitish or yellowish-white ") and 

 identical with his variety A. 



If, then, certain Lepidopterists prefer to regard the representative 

 forms of T. eris as mere local phases of one species, the fact that 

 each of them has its dry- and wet-season forms distinct from the 

 others gives them at least a claim to be regarded as subspecies 

 and to retain distinctive names. 



92. TUEACOLUS SUBFASCIATUS. 



cJ . Teracolus subfasciatus, Swainson, 111. 2ud ser. iii. pi. 115 

 (1833). 



cJ , Mweniwandas, Nyasa to Tanganyika plateau, Dec. 15th, 

 1895. (Dry-season form.) 



