IX 



exhibited but slig;ht variation from the same type ; but in North-Eastein Asia 

 the group appeared to be more unstable, for although the true Machaon was there 

 found, it was associated with two other forms exhibiting greater diverjiency from the 

 typical form. This was another instance, analogous to what he had before recorded 

 respecting the Theonoe group of the genus Leptalis, in which a certain type of form 

 was found to be constant at the opposite ends of its area of distribution, but was liable 

 to variation in intermediate localities ; thus tending to show that the development or 

 manufacture of new species takes place, not necessarily over the whole range of dis- 

 tribution of the particular type, but only in limited areas of the total range, where and 

 when the particular circumstances are most favourable to variation. 



A letter from Mr. H. L. Schrader was read by the Secretary; the writer described 

 some of his observations on species of GRceticus, from which he inferred that those 

 species are viviparous. 



Papers read. 



The following papers were read : — " Descriptions of two New Species of Papilio from 

 Ecuador,'' and " Descriptions of six New Species of Diurnal Lepidoptera from 

 Nicaragua;'' by Mr. Hewilson. 



" Contributions to an Insect Fauna of the Amazon Valley (Coleoptera, Prionides)." 

 By t!ie President. 



" Synopsis of the Species of Panorpa occurring in Europe and the adjoining 

 Couniries ; with a Description of a New Species from Java." By Mr. M'Lachlan. 



April 5, 1869. 

 H. W. Bates, Esq., President, in the chair. 



Additions to the Library. 



The following donations were announced, and thanks voted to the donors : — 

 ' Proceedings of the Royal Society,' No. 109 ; presented by the Society. 'Journal of 

 the Agricultural Society of England,' 2nd Ser., vol. v.. Part 1 ; by the Society. 

 ' Miltheiluiigen der Schweizerischen entomologischen Gesellschaft,' vols. 1 and 2 ; 

 by the Society. ' Siudien an Acariden,' von Edouard Clapaiede; by Sir John 

 Lubbock, Bart. ' Die Oiiorhynchiden s. str. nach den morphologischen Verwandt- 

 schaftsverhallnissen ihres Haulscelet's vergleichend dargestellt, von Georg Seidlitz;' 

 by the Author. ' Report on the Culture of the Japanese Silkworm, Bombyx Yama- 

 mai, in 1867-8, in England,' by Dr. Wallace ; by the Author. 'The Insect Hunter's 

 Year-Book for 1868,' and ' The Zoologist' for April ; by the Editor, E. Newman, Esq. 

 'The Entomologists' Monthly Magazine' for April; by the Editors. 



The following addition by purchase was also announced: — Gemminger and Von 

 Harold, ' Catalogus Coleopterorum hucusque descriptorum,' Tom. iii. 



Exhibitions, SfC. 

 Mr. Pascoe exhibited a new genus of Diaperinse from Espiritu Santo, in which the 

 horns on the head between or above the eyes, which distinguish many of the males of 

 Platydema, Diaperis, Hoplocephala, &c., were transferred to the apex of the prothorax ; 



c 



