132 LliPIUÜPTERA OF BlLLlTON. 



however, was received in 1888 by Mr. M. C. Piepers , which 

 collection owed its origin to the following circumstances : 



During the month of June 1888 Mr. A. G. Vorderman, 

 town-surgeon at Batavia, undertook an excursion to Billitou 

 and the neighbouring island of Mendanao for the sake of 

 his Ornithological studies. In the meantime he had brought 

 together , besides many other natural history objects , an 

 important collection of Lepidoptera, chiefly Rhopalocera, 

 which , for the greatest part , was sent by him to Mr. 

 Piepers. In none of these islands high mountains are 

 found , and the height of the localities where the insects 

 were captured does not surpass 3000 feet. The Lepidoptera , 

 which at present make part of our collection, are of great 

 interest, especially with regard to their geographical con- 

 nection with those of the neighbouring islands of Sumatra 

 and Borneo , and of the peninsula of Malacca. In my ori- 

 ginal paper (see Tijdschr. v. Entom. XXXIII , p. 279 ; pi. 

 12) all the differences I met with are carefully mentioned, 

 in order to increase the value of ray remarks, and to 

 make use as much as possible of the important collection 

 brought together by Mr. Vorderman. 



The collection received by Mr. Piepers contained 82 spe- 

 cies of Rhopalocera and 11 of Heterocera, together 93 

 species. Messrs. Godman, Sal vin and Druce, moreover, 

 notice 9 Rhopalocera and 4 Heterocera, so that the num- 

 ber of the Rhopalocera known as yet from Billitou increa- 

 ses to 91 species ^). Though there are certainly still many 

 more species to be found , especially of the small Lycaenina 

 and Hesperidina, we have already sufiicient evidence that 

 the Lepidopterous fauna of Billiton is much closer con- 

 nected with that of Malacca , Sumatra and Borneo than 

 with that of Java, 



There are only two species , an Aclolias and a Chalcosia , 

 which I believe to be new. Messrs. Godman, Salvin and 

 Druce described 3 species as new , one of which {Myrma 



1) See, however, the footnote on the foregoing page. 



Notes from the Lieyden Museum, Vol. XIII. 



