( 22r, ) 



Cerberus (Feld.). The adiierviilar white streaks of the forewings seem to be as 

 constantly i)reseut above and below as in the male sex ; the markings at the sub- 

 median nervure are mostly feebly marked on the ' upperside ; sometimes they are 

 entirely absent from both sides of the wing. 



On the lundwings there is in some specimens a rather large yellow discal >]iot 

 before the subcostal vein ; the length of the discal yellow markings is variable. The 

 black border of the wings includes usually a series of geminate, adner\ular, \ellow 

 spots of variable size; these spots are larger below than above. 



The abdomen bears beneath two series of black spots, of which those upon the 

 lifth to seventh segments are larger; the spots are sometimes confluent with one 

 another. 



Ildb. I'hiliiipine l^lands (recorded from nearly all the islands) (14 d, 15 j). 



(b): T. rhadamantus plateni (Standing.) [J,?]. 



(J?. Oi-Mthojtlera plateni Staudinger, Iris I. p. -274 (1888) (Palawan); id., /..-. II. p. .S (I88it) 



(Palawan) ; Fickert, Zuol. Julirhiich. p. 762 (188'j). 

 (J?. Omitlioj>lira {Pria/iwjiterti) pliiteiii, Rippon, Jcun. Driiitli, text & plate ((J,?) (1890) 



(Palawan). 



There is a female specimen in my collection with tlir locality "Palawan" 

 attached to it which is so very close to the female of T. rhadaiaantus (Lucas) 

 that I had much doubt whether it really came from that island, till I found in 

 Staudinger's careful description of plateni, in Iris II., a similar Palawan siiecimen 

 mentioned. Staudinger says that his specimen is distinguishable from the Philippine 

 t'emales only by the yellow discal markings of the underside of the hindwings being 

 shaded with whitish or grey, and by the adnervular, submarginal spots of the same 

 wings below being conspicuously large and whitisli grey. The first of these two 

 characters appears, however, also in certain rhadamantus females, though the 

 peculiar creamy huff shade is less extended. The second character does not apply 

 to my rhadainantu3-\ike female of plateni ; the submarginal spots are small and 

 yellow, excejit the two anterior ones, which are, as in some Philij)()ine females, creamy 

 buff. This proves, however, that the females of plateni and rhadamantus cannot 

 be separated specifically. In the male sex, the difference between the dark Miudoro 

 individuals, with the median cellules and part of the discoidal cell overjiowdered witli 

 black scales, and those examples of plateni which exhibit disper.sed yellow scales 

 within the black region of the hindwings, is again rather slight. Staudinger says 

 himself (I.e.) that plateni is perhaps only a local form of " nephei-eus Gray" [recte 

 rhadaviantus (Lucas)], and I must adopt this opinion. T. rhadamantus plateni 

 (Stauding.) is certainly one of the most interesting forms of Troides, especially so 

 as it forms a transition to the T. dohertyi (Rippon) with an entirely black up])erside 

 to the hindwings. 



S . The yellow area of the upperside of the hindwings is mostly reduced to two 

 sjwts standing between the costal margin and the upi)er di.^^coidal vein. Many 

 specimens have a third small mark behind that nervnle, and in one of Staudinger's 

 e.xamples this mark is so much enlarged as to reach the second discoidal vein. 

 Within the cell there is often a narrow yellow streak along the subcostal nervure. 

 Below, the yellow area consists of eight large spots ; the area ajji^ears greenish in 

 certain lights as far as the black colour of the upperside is extended. The median 

 cellules are often almost black ; sometimes they have only a black sprinkling, or are 

 almost pure yellow. 



