638 Pieter C. T. Snellen on a 



Genus Pterygisus, Butler, Trans. Ent. Soc. Lond., 



1886, p. 429 {Isopteryx, Guenee, Lederer). 



230. Pterygisus focdalis. 



Isopteryx foedalis, Guenee, Delt. et Pyral., p. 228, 

 pi. 4,f.7._ 



I. tenellalis, ibid., p. 228. 



Physematia epispila, Meyrick, Trans. Ent. Soc. Lond., 

 1886, p. 257. 



A male. 



As the name Isopteryx was pre-occupied, Mr. Butler 

 changed it into Pterygisus. 



Sikkim ? ; 



Genus Hydrocampa, LatreiUc, Fam. Nat., p. 478 ; 



Led., p. 451. 



231. Hydrocampa exsolvalis. 



Hydrocampa exsolvalis, Snellen, Lepidoptera, in Pieize 



in Midden- Sumatra, p. 76 U880). 

 Cymorizainextricata, Moore, Descr. Indian Lep., p. 210, 



pi. vii., f.7 i^); S. & C, No. 4390. 

 C. rivularis, Moore, Descr. Indian Lep., p. 210, pi. vii., 



f. 8 ( ? ) ; S. & C, No. 4395. 



This species is no Cymoriza; it is true that the 

 characters of Hydrocampa, Lederer, are also not strictly 

 applicable to it, but as I have not yet had the oppor- 

 tunity to examine a male, I abstain from forming a new 

 genus, which I suppose will be necessary. 



Sikkim; Moller. 



232. Hydrocampa simplalis, nov. spec. 



A female of 19 mm. expanse. 



This species belongs to Lederer's Section A of the genus 

 Hinterfliigelrippen normal) ; the markings, however, are less 

 complicated, the first line of fore wings absent, the upper part of 

 the second regularly arched, not sinuous or angulated. Antennae, 

 palpi, head, thorax and the ground colour, the wings white, not 

 very pure, a little greyish. No first line nor discal spot ; second 

 line arched, the upper part from the costa to vein 3 distinct, neai'ly 

 black, the inferior hardly visible. Hind wings with a black discal 

 spot and a thin sinuated grey discal line. Hind margin narrowly 



