286 LYONETID.E. 



Head wliitisli. Fnce and palpi white. AnteniifG pale fuscous; the 

 basal joint white. Anterioi- wings white, with tico somewhat indis- 

 tinct /«.5'C'0«.s lines from the base to beyond the middle, inclnding between 

 them posteriorly a fuscous blotch ; a smaller fuscous blotch lies at 

 the base of the inner margin ; beyond the middle is an angulated fus- 

 cous streak from the costa which reaches only to the fold, beyond it is 

 another less angulated fuscous streak which reaches to the inner mar- 

 gin ; beyond this are two other short costal streaks ; at the apex of the 

 wing IS a black spot, from which three fuscous streaks radiate in the 

 white cilia, and below it is a fuscous hinder-marginal line ; the apical 

 portion of the wing is frequently suffused with pale fuscous. Pos- 

 terior wings whitish, with white cilia. 



Hitherto scarce ; appears in July and autumn, liybernated spe- 

 cimens occurring in the spring. The larva feeds in June, Au- 

 gust, and September, in the underside of smooth-leaved willows 

 (principally on Sallx hellni), making a large blotch. 



c-V-C 



Genus III. CEMIOSTOMA. W-TID. ^ 



Ceimiostoma, Zell. L. E. iii. 273 (1848). Lencoptera p., Hiib. Ar- 

 (jyroniicjes p., Step. Opostega p., Zell. Isis, 1839 ; Dup. 



CaplUi sqiiamacei, ajipressi. Antennre alls anterioribus breviores, con- 

 chula basali mediocri. Palpi nulli. Alpe anteriores caudulataj, po.s- 

 teriores angusti"e lanccolatte ; anteriores : cellula discoidalis venas 

 duas in costam emittit, vena mediana in marginem posticum cxcur- 

 rit, vena subdorsalis simplex ; posteriores : vena mediana in tres 

 ramos divisa. 



Head smooth, with oppressed scales. Antennae shorter than the an- 

 terior wings, the basal joint forming a moderate-sized eye-cap. Palpi 

 none. Anterior wings caudulate, the posterior narrow, lanceolate. In 

 the anterior wings the discoidal cell emits two veins to the costa ; the 

 median vein runs into the hinder margin ; the subdorsal vein is simple. 

 In the posterior wings the median vein divides into three branches. 



8cHclla diifers from the characters above laid down, in having 

 tlie slender scales at the back of the head erect, and in the ante- 

 rior wings the discoidal cell emits a furcate vein to the costa, a 

 sini])le one before the apex, and three (two of them obsolete) to 

 the hinder margin, and in the posterior wings the median vein 

 has two branches obsolete. 



The insects of this genus, of which very few are at present 

 km)wn, and we have oidy three British species, are remarkable 

 for tlunr beauty. The radiating dark lines in the cilia arc more 

 developed in this than in the preceding genus. The larva are 



