of the Genus ElacMsta. 309 



opposite spots (exactly opposite) more distinctly whitish, the 

 costal spot is rather the larger of the two ; cilia grey. 



The female is only a little darker, with the spots more dis- 

 tinct. 



The larva, which is dull-yellowish, with a very faint greenish 

 tinge, mines the leaves of Aira ccespitosa, making flat, whitish, 

 rather broad mines in April and the beginning of May. 



The perfect insect appears at the end of May and in June ; it 

 occurs near Ziirich. 



34. ElacMsta Poce, Douglas. 



Best distinguished by its dark colour, and general dull ap- 

 pearance, the fascia and spots in the male being excessively in- 

 distinct. 



Male. — Expansion of the wings 4| — 5 lines. Head dark fus- 

 cous ; anterior wings rather glossy, dingy fuscous, darker beyond 

 the middle ; before the middle is a slightly angulaled obscure 

 pale fascia ; beyond the middle are two very indistinct oppo- 

 site spots ; the apex of the wing is rather obtuse ; cilia dark 

 grey. 



Female. — .Expansion of the wings 5 — 5| lines. Head dark 

 fuscous ; anterior wings rather glossy, dark fuscous, darker 

 beyond the middle, with a doubly angulated whitish fascia before 

 the middle, and two yellowish-white opposite spots beyond the 

 middle, sometimes with some whitish scales placed posteriorly 

 between them ; cilia dark grey. 



The larva, which is pale whitish-yellow, with the dorsal vessel 

 greenish-grey, mines the leaves of Poa aqiiatica, making long 

 slightly-discoloured mines in April and at the end of July. 



The insect appears in May and August ; it occurs in the neigh- 

 bourhood of London. 



35. ElacMsta Bifasciella, Treitschke. 



By the two very distinct broad white fasciae, this may be at 

 once recognised from every other known species. 



Expansion of the wings 3g lines. Head whitish ; anterior wings 

 blackish, with a nearly straight broad fascia before the middle, and 

 a second broad white fascia, rather curved, beyond the middle ; 

 cilia grey. 



Larva unknown. 



The perfect insect appears in August ; it occurs at Vienna and 

 Ratisbon, and in Bohemia and Switzerland. 



