TERACOLUS. By Dr. C. Aurivillius. 
51 
the basal part of the hindwing above unicolorous white or in the ? sometimes yellowish; expanse only 28 to 
32 mm.; base of the forewing above more or less broadly bluish grey; under surface light greenish yellow or 
in the winter form, f. arne Klug, more or less reddish. — rothschildi E. Sharpe (16 b) is larger, 42 to 47 mm., 
and has the black markings better developed; hence the ground-colour of the forewing only forms a sharply 
defined transverse band about 5 mm. in breadth; the basal part of the hindwing above is unicolorous white 
or yellowish; the ? is similar to the c? or has the ground-colour above white (= ab. albus ah. nov.) or ochre- 
yellow (= ab. ochraceus ah. nov.) (16b). British East Africa — ocellatus Btlr. (16 b, c) is very similar to 
typical phisadia. but is at once distinguished by having the basal part of the hindwing above anteriorly salmon- 
coloured and posteriorly white. Somaliland. 
T. vestalis Bltr. The type-form (vol. IX, pi. 73 c) only occurs in South Asia. — castalis Stgr. (16 c) 
is very similar to the whitish ?? of the preceding species, but the pure white ground-colour of the upper 
surface forms a much broader transverse band on the forewing and the black marginal band on the hindwing 
above is usually spotted; there is also a white spot on the forewing in cellule 1 b; rarely these white spots 
in the marginal bands are absent, f. nigricans (16 c). British East Africa and Somaliland. 
arne. 
rothschildi. 
albus. 
ochraceus. 
ocellatus. 
vestalis. 
castalis. 
nigricans. 
T. gaudens Btlr. (15 e). Forewing above orange-yellow, hindwing grey-yellow, both with thin black ganders. 
veins and broadly bluish white at the base; the forewing with rather large marginal spots, almost united 
into a narrow marginal band, and a black discal line, which, however, terminates at vein 3; the hindwing 
above without discal line and only with very narrow marginal line, under surface light yellowish with indistinct 
orange-yellow spots or reddish, f. arenicolens Btlr. Abyssinia and Arabia. arenicolens. 
T. chrysonome Klug (vol. I, pi. 23 c) is very similar to the preceding species, but has a complete discal chrysonome. 
transverse line, reaching to the hindmargin, on the upperside of the forewing and an indication of this transverse 
line on the hindwing. In the ? the ground-colour is lighter, the base not white and the transverse line on 
the hindwing quite distinct. In the type-form the hindwing is beneath yellowish with reddish spots, but in the 
dry-season form, f. helvolus Btlr., more or less reddish. German East Africa to Somaliland, Nubia, Bornu and Arabia, helvolus. 
T. doubledayi ELpff. (1 5 d) is larger than the two preceding species and is distinguished by the very doubledayi. 
broadly black veins on the upperside of the hindwing and the broader, light-spotted marginal band of both 
wings; the discal line of the hindwing above is indicated, but not so sharply prominent as in the following 
species. Sierra Leone, Congo region and Angola. 
T. aurigineus Btlr. (15 e) also nearly approaches the preceding three species, but has a brighter ground- aurigineus. 
colour, sharper black markings and a smaller white basal spot on the forewing, only extending to the middle 
of the cell; the veins are only narrowly black and the black spot at the end of the cell of the forewing is 
larger and more rounded; the ground-colour of the hindwing beneath in the type-form is light yellowish, but 
in the winter form, f. venustus Btlr. (15 e), reddish. Distributed from Nyassaland to Somaliland and Equatoria. venustus. 
T. ansorgei Marsh, differs from aurigineus only in the absence of the white basal spot of the forewing ansorgei. 
above and is probably only a race of the latter. German East Africa. 
T. vesta. This variable species has essentially the same markings on the upper surface as aurigineus, 
but is distinguished by having both wings broadly white or whitish at the base, although this is sometimes 
suffused with black-grey or blue-grey. The discal transverse line on the upperside of the hindwing is always continuous 
and the marginal band is broad. The black spot at the end of the cell of the forewing is large and above 
usually joined to the dark costal margin. On the underside of the forewing the ground-colour is bright orange- 
yellow from the base to the transverse band. The hindwing beneath with three red-brown transverse bands. 
— In rhodesinus Btlr. the ground-colour of the upper surface is light ochre-yellow, almost cream-coloured, rkodesinus. 
the black discal band as narrow as in aurigineus or somewhat narrower, and the black marginal bands 
scarcely broader than in that species; the basal area of the hindwing above is light ochre-yellowish next to 
the discal band and the light submarginal band much broader than the black marginal band. Central Africa 
at the Meru Lake. — vesta Reiche (15 e) differs from rhodesinus in having the discal band on the hindwing vesta. 
above much broader and the basal area next to it white; the base of both wings above is broadly dusted 
with blue-grey to blackish and the white colour of the base on the upperside of the forewing is only present 
in cellules 1 a und 1 b, being entirely suppressed in the apex of the cell by the light reddish yellow ground¬ 
colour; the ground-colour of the hindwing beneath is bright yellow. The form was described from Abyssinia; 
but quite similar specimens occur also in South Africa. — mutans Btlr. (16 d) closely approaches true vesta mutans. 
and only differs in having the ground-colour somewhat lighter and the cell of the forewing above filled up 
with white to the apex; the ground-colour of the hindwing beneath is sometimes light yellow, sometimes 
reddish: f. argillaceus Btlr. (16 c). Distributed from Damaraland and Natal to British East Africa. — catachrysops ( .^ach^sops 
Btlr. (16 c, d) is distinguished at once from the other forms of vesta by the broad black marginal band of 
the hindwing and the consequently much reduced light submarginal spots; the ground-colour of the hindwing 
beneath is bright yellow. German and British East Africa. 
