MICRO-LEPIDOPTERA. 



79 



29. Phthorimaea heliopa, Low. 



Rebel (Mitt. Naturh. Mus. Hamb. xxxii, 154) describes as Gelechia (Lita) sp., 

 without recognising or naming it, an insect which is unquestionably this species ; 

 the collection submitted to him was mostly made at light in Apia. No example 

 exists in the material in my hands, but the species is a well-known pest of the 

 tobacco-plant, and practically certain of introduction ; it is now generally 

 distributed in India, the Malayan Islands, Australia, and South Africa. 



30. Thyrsostoma nephelochtha, n. sp. 



11-13 mm. Head, thorax pearly- whitish. Antennae $ with scape 

 very long and stout, also a somewhat thickened Superscape, § of scape, ciliations 

 under 2. Palpi whitish, second joint S with long expansible whitish hairpencil 

 projecting from furrow beneath, terminal joint as long as second, thickened. 

 Forewings very narrow ; shining whitish, tinged ochreous on edge of markings ; 

 markings grey, obscure ; rather thick irregular suffused streaks along costa and 

 dorsum throughout, confluent at apex, connected by rather inwards-oblique 

 moderate fasciae towards base, in middle, and towards apex, but median fascia 

 sometimes interrupted in disc : cilia whitish-grey. Hindwings pale grey ; cilia 

 whitish-grey. 



Upolu, Malololelei, 2,000 feet, Vailima, April, June, November, December ; 

 5 ex. The structure termed above the Superscape I have elsewhere treated 

 as an elongated joint, but it is apparently rather three or four joints soldered 

 together. 



31. Thyrsostoma triphona, n. sp. 



$ 11 mm. Head, thorax silvery- whitish. Antennal scape long and stout, 

 Superscape somewhat longer than in nephelochtha, § of scape, ciliations long (3). 

 (Palpi missing.) Forewings very narrow ; grey- whitish ; markings obscure, 

 grey ; three incomplete broad rather inwards-oblique fasciae, first towards 

 base, not reaching dorsum and hardly costa, second antemedian, not reaching 

 costa, considerably narrowed and more oblique inwards towards dorsum, third 

 reduced to a thick streak above tornus running into a transverse spot just before 

 apex and sending a longitudinal line to costa near, similar lines from first and 

 second fasciae run parallel with this beneath costa to near apex : cilia whitish- 

 grey. Hindwings grey ; cilia pale grey. 



Upolu, Vailima, October ; 1 ex. The difference in the antennal ciliations 



