268 PERCY SLADEN TRUST EXPEDITION 



Eucosmidse. 



Herpystis, n. gen. 



Palpi porrected, second joint rough-scaled above and beneath, terminal moderate. 

 Thorax without crest. Forewings with 7 to termen, separate. Hindwings with 3 widely 

 remote, parallel, 4 from angle, 5 approximated to 4 towards base, 6 and 7 closely 

 approximated towards base. 



A development of Eucosma, characterised by the peculiar neuration of hindwings. 



4. Herpystis rusticula, n. sp. 



$. 9 mm. Head whitish, with a few fuscous scales. Palpi white, second joint with 

 a lateral streak of fuscous irroration. Thorax fuscous- whitish, shoulders infuscated. 

 Abdomen greyish. Forewings elongate, costa gently arched, without fold, apex obtuse, 

 termen slightly sinuate, hardly oblique, rounded beneath; ochreous- whitish, indistinctly 

 strigulated with fuscous irroration, with a few blackish scales, costa and dorsum more 

 or less strigulated with dark fuscous ; basal patch represented by a small spot of dark 

 fuscous irroration on costa at \, and a rather outwards-oblique fascia suffusedly out- 

 lined with dark fuscous irroration from dorsum at f-, reaching more than half across wing; 

 central fascia with costal and dorsal thirds narrow, formed of dark fuscous irroration 

 or suffusion, dorsal concave anteriorly, middle third absent except an oblique blackish 

 spot representing angle, above which is a small whitish-yellowish spot; beyond this 

 a pale leaden-metallic stria ; a slender dark fuscous fascia before termen, forming an 

 acute angular projection inwards above middle, finely attenuated towards tornus, fol- 

 lowed below middle by a pale leaden-metallic striga. Hindwings grey; cilia whitish-grey, 

 with grey subbasal shade. 



Silhouette, Mare aux Cochons plateau, 1000 feet, in September; one specimen, not 

 in good condition. 



Eucosma Hueb. 



5. Eucosma plebeiana Zell. 



Bird Island, Seychelles, in July, one specimen (Fryer) ; and I have also a specimen 

 taken by Mr T. B. Fletcher in Farquhar Island. Doubtless introduced ; now nearly 

 cosmopolitan in suitable climates. Larva on Malva and allies. 



6. Eucosma chlorobathra, n. sp. 



?. 9 — 10 mm. Head whitish-ochreous. Palpi whitish-ochreous, a spot on second 

 joint and base of terminal joint fuscous. Thorax whitish-ochreous, shoulders infuscated. 

 Abdomen grey. Forewings elongate, slightly dilated posteriorly, costa slightly arched, 

 apex obtuse, termen sinuate beneath apex, vertical, rounded beneath; whitish-ochreous, 

 irregularly sprinkled with fuscous; costa strigulated with blackish-fuscous; edge of basal 

 patch indicated by a thick curved blackish-fuscous line; space between this and termen 

 mostly occupied by several thick irregular subconfluent bluish-leaden metallic striae 

 rising from ochreous-whitish costal strigulse ; an irregular curved series of blackish- 

 fuscous marks representing posterior edge of central fascia; two small blackish spots 



