1901.] L. de Niceville — Butterflies of the mhgenus Tronga. 13 



species of ttie subgenus from Borneo are given as distinct, and from the 

 other literature at his disposal. I was no more successful than Mr. 

 Shelf ord, and as in Calcutta I am shut ofp from access to the tjpe speci- 

 mens of all the described species, 1 despatched twenty-two male Tron- 

 gas from Sarawak to Dr. Moore, who has been so kind as to set them 

 all, and to return them to me. Under the date 7th October, 1900, he 

 writes to me :— " I have compared your twenty- two male Trougas with 

 the types available, and have put the name to a specimen agreeing 

 exactly with the types of T. cmmeri, Lucas, 2\ brooJcei, Moore and 

 T, lahuana, Moore. I have also enclosed a pencil sketch of the types of 

 T. moorei, Butler, and T. prf/eri, Moore, to which none of yours ao-ree. 

 The types of all these are now in the British Museum. The other 

 unlabelled specimens of Tronga returned you will easily be able to 

 match with the verified specimens. I liave not been able to examine 

 them with T. duatensis. Moore, as I have no opportunity now of com- 

 paring them with the type. I hope these will enable you to satisfv 

 yourself as to their specific value or otherwise." I would have been 

 still more grateful to Dr. Moore for his kindness than I am had 

 lie been so good as to have given me his opinion as to the names 

 by which the nineteen specimens he returned unnamed should be 

 known. In this and similar cases it is not difficult to pick out and 

 name extreme individual forms of a variable species, but it is the inter- 

 mediate specimens that puzzle one. However, with three named 

 species, drawings of two others, and the description of the sixth 

 it is not difficult to deal with the species of Tronga found on the north- 

 ern side of Borneo. I may note that the Island of Daat, from whence 

 T. daatensis was described, is quite close to the much laro-er island of 

 Labuan on the North-West coast of Borneo ; both these islands lie very 

 near to the coast, and are therefore not likely to possess any species 

 peculiar to them, especially Euploeas, which are well known to have 

 very tough constitutions and to take long and voluntary journeys. On 

 this subject Mr. W. P. Pryer in Ann. and Mag. of Nat. Hist., fifth 

 series, vol. xix, p. 48, n. 16 (1887) has some very interesting notes on the 

 migrations of Euflceas in North Borneo. 



Dr. Moore in Proc. Zool. Soc. Lond., 1883, gives twelve species of 

 Tronga^ h ova. the Nicobar Isles, Lower Burma, the Malay Peninsula 

 Sumatra, Nias, Borneo, and Oiiina. The latter habitat is most vno-ue, as 

 China is a vast country. In " Lepidoptera Indica," vol. i, pp. 76-80 

 (1890), Dr. Moore retains twelve species in the genua, out of which he 

 describes as new T. nicevlllei from the Sunderbunds near Calcutta, and 

 T. heylsertsii from Sumatra, but he sinks his T. oUvacea, Moore, as a 

 synonym of T. hremeri, Felder, and omits all reference to T. kinhergi, 



