120 ME. G. T. BETHUNE-BAKER : A REVISION OF THE 



is usually extended to the submedian nervure instead of to the lower median nervule 

 only, whilst in the secondaries there is usually a very distinct though sparing scaling 

 of metallic-green colour at the anal area. 



? . Indistinguishable from singla, except perhaps by the green-metallic scaling of 

 the anal area. 



I have very cr.rofully compared de Niceville's species A. teesta with this species of 

 Hewitson's and find they are identical in every particular. A. bazalus Hew., of 

 de Niceville's ' Butterflies of India,' no. 804. p. 249, vol. iii., should be referred to 

 A. bazaloides Hew. 



The ordinary form of this insect is intensely deep blackish purple, but this varies, 

 even in specimens from the same locality. From the Khasia Hills I have specimens as 

 dark as any I have seen, and I have also a few specimens not nearly so dark, of merely 

 a dark sublustrous violet-purple. The width of the border varies also in like manner, 

 some are almost linear, whilst others are broader, aud one specimen, lent me by 

 Mr. Druce, is most remarkable in this respect, the border being nearly an eighth 

 of an inch wide and increasing at both the apex and anal angle. 



Turbata Butl., from Japan, is, without doubt, the same species, the only difference 

 being that the underside is perhaps a little more uniform ; the pattern is precisely the 

 same, and it varies in the blue of the upperside exactly in the same manner as do the 

 Khasia Hill specimens. It is a widely distributed insect, though apparently local : 

 the types are from Sylhet and Java ; it also occurs in Sikkim, Assam, Upper 

 Tenasserim, Sumatra, Java, S.E. Borneo (from where I have one female), and Japan. 



Arhopala singla (de Niceville). (Plate V. figs. 20 & 20 a.) 

 Satadra singla de Niceville, J. A. S. B. vol. liv. pt. 2, p. 119, pi. ii. figs. 7 ? , 8 £ (1885) ; id. 

 Butt. Ind. vol. iii. p. 250 (1890). 



Hab. Sikkim ; Burma (Shan States). 



Expanse, 6 about 46, 2 46-50 mm. 



De Niceville says : " I have no doubt whatever that A. singla and A. teesta (i. e. 

 bazalus Hew.) represent two perfectly distinct species, as the males can be distinguished 

 at a glance by the coloration of the upperside ; but as the undersides of the two species 

 are alike I do not know how their respective females from Sikkim are to be recognised. 

 As A. singla is only known from Sikkim, females from other localities may safely be 

 placed under A. teesta (i. e. bazalus Hew.) (Butt. Ind. vol. iii. p. 250)." I have no doubt 

 that this remark is quite correct. A. singla is evidently a local and not common 

 species, at least A. bazalus is sent to this country in far greater numbers, but since 

 de Niceville wrote as above the species has been taken in the Shan States of Upper 

 Burma. The genitalia have a good-sized tegumen, the hooks of which are strongly- 

 curved at their bases, the clasps have a long arm-like extension ; the penis is stout, 

 rather long, with a trumpet-shaped orifice. 



