768 MR. A. G. BUTLKR ON [NoV. 3, 



T. vestalis will ere long be discovered. 2'. j)hisadia (from Aden 

 evidently) has been redescribed and figured by M. Mabille under the 

 name of Idmais philamene ; the form is that figured by Klug as 

 Pontia arne. 



32. Teracolus chrysonome. 



Pontia chrysonome, Klug, Symb. Phys. pi. 7. figs. 9-11 (1829). 



c? 2 . Bunder Maria, 27th-30th April, ISM.—Yerbury. 



(S 2 • 2nd January. — Thrupp. 



The species appears to be tolerably common in Somali-laud ; it is 

 quite constant in coloration and markings ; as may be seen from 

 King's figures, the males only have the base of the wings bluish and 

 white. 



33. Teracolus protomedia. 



Pontia protomedia, Klug, Symb. Phys. pi. 8. figs. 13, 14 (1829). 



S ? . Dura, December 23rd. — Thrupp. 



As usual, this species has not come in good condition ; no speci- 

 men hitherto sent to the Museum has been quite perfect. T. proto- 

 media is another of the Aden species introduced into the fauna of 

 Madagascar by M. Mabille ; it is evident that some collection made 

 at Aden lias been forwarded to him as from Madagascar. The Lepi- 

 doptera of Arabia are peculiar ; they do not, in all probability, range 

 further southwards than Somali, and even there they are frequently 

 replaced by allied but distinct species ; that they should turn up 

 again, in no respect modified, in Madagascar, is quite out Oi^ the 

 question. 



34. Teracolus heliocaustus, sp. n. (Plate XLVII. figs. 8, 9.) 



Exactly intermediate between the variety T. miriam of T. pleione 

 and T. acaste, in size, pattern, and colouring. The male has the 

 apical border of T. miriam, but the orange area is confined by the 

 discoidal cell on the anterior half of the wing, and on the posterior 

 half only differs from that on the primaries of T. acaste j in ex- 

 tending to the base ; the secondaries have the orange costal area of 

 T. acaste, but at the base it fills the discoidal cell and suffuses the 

 interno-mediau area almost as much as in T. oniriam ; the black dis- 

 cocellular spot on the primaries is formed as in T. acaste : the under 

 surface shows the orange basal area of T. miriam, but the ochraceous 

 apical area of primaries and eutii-e surface of secondaries of T. acaste. 

 The female exhibits the pattern of T. coelestis rather than of T. acaste ; 

 but the marginal spots are larger than in either ; the costal and in- 

 ternal borders of primaries towards the base are dark greyish ; the 

 discoidal cell and the whole interno-median area, as far as the discal 

 series of spots, are orange, which colour therefore does not extend 

 quite so far outwards as in the male : on the under surface the pat- 

 tern is the same as in T. acaste $ , but the basi-internal half of the 

 primaries is orange, the apical border ochraceous, and tiie secondaries 

 yellow with diffused ochraceous external border and orange basi- 



