( XXXV ) 



him from Mr. Hall, of Buenos Ay res : " The Sianhopea I sent 

 you had been in my conservatories for some years. It origin- 

 ally came from Santos, Brazil (Province of Sao Paulo)." Dr. 

 Wallace had written to Professor E. B. Poulton concerning 

 this very interesting observation : " As Mr. Hall's conserva- 

 tories are in the suburbs of Buenos Ayres, the Gastnia is 

 hardly likely to have inhabited that treeless region. South- 

 west of Santos there appears to be an almost uninhabited tract 

 of hilly country between the Sierra and the sea, and therefore 

 probably forest-clad and more likely to produce both the 

 orchid and the moth. I should not wonder if the coast forests 

 of Sao Paulo were very rich and perhaps not much known, as 

 every traveller wants to get into the ' interior,' and away 

 from the coast. Of course, ' some years ' may mean ' more 

 than one,' and the plant having been gathered when dry and 

 dormant the insect may have been delayed in emerging." 



EURYTELA HIARBAS, DrURY (1782), A PROBABLE FORM OF E. 



DRYOPE, Cramer (1775). — Professor Poulton said that he had 

 received a letter from Mr. G. F. Leigh, F.E.S. of Durban, 

 containing the following interesting observation : " I have to 

 I'ecord that on two occasions within a week, viz. on the 3rd 

 and 7th of April [1909], I saw Earytela dryoiie^ in cop. with 

 E. hiarbas, and only once in cop. with its own form. I am 

 going to breed fx'om a 5 of £^. hiarhas, and perhaps I shall 

 prove that it and E. dryojie are forms of the same species, as 

 indeed I quite expect them to be." 



Professor Poulton said he had asked Mr. Marshall his 

 opinion as to the specific identity of these two forms and had 

 received the following reply : " I have long had suspicions as 

 to these two f oi'ms ; for not only did Bowker take them paired 

 long ago, but he also caught what appears to be an inter- 

 mediate form, described by Trimen, and named hiarhas var. 

 Jlavescens by Aurivillius. On the other hand, if they are 

 species it is rather singular that their ranges are not coinci- 

 dent. For instance, hiarbas is common in the forest regions 

 of Eastern Cape Colony and even ranges as far west as Knysna, 

 while dry ope is not yet known from south of Natal. Again a 

 form of dryope occurs in Madagascar, but no Idarhas, and so 

 forth. Then hiarhas varies geographically in the width of the 



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