. Transactions of the Entomological Society of London. d-dunes on our British coasts are true deserts,small though they be; on them C. pamphUus, P. cardui,A. aglaia, G. phlaeas, L. warns and astrarche may gener-ally be found among the bents, while now and then aColias may be seen coursing over the sand; such are desertbutterflies, though they may all be found inland livingunder very different conditions. Looked at in this way, we see that whereas among * Journal Bombay Nat. Hist, Soc, 1892, p. 208. 288 Dr. G. B. LongstafT on Butterflies of Kordofan. Capt. Wilsons twenty added species four only
. Transactions of the Entomological Society of London. d-dunes on our British coasts are true deserts,small though they be; on them C. pamphUus, P. cardui,A. aglaia, G. phlaeas, L. warns and astrarche may gener-ally be found among the bents, while now and then aColias may be seen coursing over the sand; such are desertbutterflies, though they may all be found inland livingunder very different conditions. Looked at in this way, we see that whereas among * Journal Bombay Nat. Hist, Soc, 1892, p. 208. 288 Dr. G. B. LongstafT on Butterflies of Kordofan. Capt. Wilsons twenty added species four only bear the D,no fewer than twenty-two of the White Nile species thathe did not send home bear that mark. Undoubtedly the fauna of Southern Kordofan has notthe very marked desert character of that found nearerthe river, but at the same time it can scarcely be deemedto be a forest fauna. It is curious that of the ten Skippers not one is commonto the two lists. Capt. Wilson may be congratulated on having takenone species and two varieties new to CONGO SttmfbrrU Gmg* Es&&* London ( 289 ) XL On Certain Forms of the Genus Acraea. A reply toM. Ch. Oberthiir. By H. Eltringham, , , [Read June 7th, 1916.] Plate LXXIV. In M. Charles Oberthiirs Etudes de LepidopterologieComparee, Fasc. xi, 1916, appears a study of MadagascanLepidoptera, largely dealing with species of the genusAcraea. M. Oberthiir states that after reading with greatpleasure my monograph of the African species of thegenus Acraea he has been moved to endeavour to completesome of the details and dispute some of my conclusions. I would say at the outset that any criticism of my workis welcomed by no one more than by myself. M. Oberthiir(p. 133, ) says, Un meme sentiment nous anime, Professeur Houlbert et moi meme; la recherche de laverite. All true scientific workers are animated by thissentiment, and if I feel it necessary to criticise to someextent Professor Houlberts conclusions, he will, I
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