29 



Genus ERIONOTA Mab. 



I. Thrax Clerck L. (PL VIII, fig. a. b). 



Clerck, Icoucs, pi. ^2, fig. 2 (iJSO) Papilio Thrax. 



Linnaeus, Syst. lYaL, Ed. XII, I, 2, /. 794, No. 260 ( 1 767) 

 HoKSFiELD and Moore, Cal. Ltf. E. I. C, I, /. 254, 



A- 7. f'S- 5 ^(i'"^'^' 5'^ P^'P<^ (1857) Hesperia „ 



PiEPERS, Tijdschr. v. Ent., 19, /. 158 (1875 — 1876) . 



De Niceville, Journ. As. Soc. of Bengal ^o, 2,/. 260(1 881) Ereonota Acroleuca. 



Plotz, Stdt. Ent. Zcit. 1882, s. 327, 1886, .?. 91 . . Hesperia Thrax. 



Distant, i?//o/. y]/a/., />. 393 //. 34, //i--. 17(1882 — 1886) Erionota 



Elwes, and Edwards, Trans. Zool. Soc. 0/ London, 14, 4, 



/. 217 (1897) 



The form Acroleuca de Nic. that has white scales near the apex of the 

 fore-wings occurs on Java with the type. 



W. J. Batavia (3 — 14); Buitenzorg (265); Tjampea (160); Sindanglaya 

 (1074); mount Salak (780); mount Tjerimay in the province of Tjeribon 

 (2003); Megamendoung mountains (1500). The neighbourhood of the Tjiletou 

 or Sandba}' (200). 



C. J. Magelang in the province of Kadou. 



E. J. Semarou mountains (2200); Sourabaya on the east coast; province 

 of Pasourouan (+ 500) (Fruhst). 



The above-mentioned variety Acroleuca represents only the individuals, 

 that are in a more advanced stadium of colour-evolution and in which there- 

 fore a part of the yellow already faded into white. By daylight the butterfly flies 

 only when it is roused, else only in the twilight; when flying it makes a soft 

 enashine sound ; when at rest and touched with the hand on the antennae it 

 seems not to take any notice thereof, but then the same is done on one of 

 its legs it flies away immediately. Sometimes it makes vibratory movements 

 with the wings just as the Sphingidae before flying, but as with these moths 

 this is evidently a preparation to enable themselves to fly such is surely 

 not the case with Thrax, because this species is also perfectly able to fl>- up 

 without doing so. One evening during a heavy shower of rain such a butterfly- 

 flew into a room where a lamp was burning, and directly it went to the light 

 just as many Heterocera do. The caterpillar is to be found wherever its 

 principal food but exists, viz., the leaf of \he pisang (Musa spec), that is to sa)', 

 wherever on Java human dwellings are found. I found them also on the leaves 

 of kclappa (cocos kucifera L.), of rhapis flabelliformis, oi Idray (metroxylox 



