The Scottish Naturalist. 



i73 



discovered near the inner •margin. Some species have a whitish or silvery central 

 vein posteriorly fissured. 



TRISTELLUS S.v. — Antennae setaceous ; palpi long. F.-w. 

 elongate, acute (acuminate in the female), hind-margin rounded 

 below the tip ; dull yellowish ; central vein broadish, sil- 

 very or yellowish, its branches pale. Hind line indistinct, 

 but usually a trace of it can be seen ascending from the inner- 

 margin, sometimes it is altogether absent, and sometimes can 

 be traced across the wing. Hind-margin scarcely spotted with 

 fuscous. H.-w. grey. 11-14Z. 



Ab. b. F.-w. yellowish fuscous, inner margin paler. 



Ab. c. F.-w. central vein slender, opaque, white, interrupted 

 and margined with fuscous. Palcella H. 



Ab. d. F.-w. yellowish fuscous, central vein not paler. Aqui- 

 lella H. 



July to September. Europe except the polar regions. A very common 

 species in Britain, occurring probably throughout. 



selasellus h. — Antennae setaceous ; palpi long. F.-w. 

 less elongate, hind-margin rounded ; greyish-ochreous, central 

 vein thickened, silvery, bifid at its extremity, shaded with grey 

 above. No hind line. Hind-margin scarcely spotted with fus- 

 cous. H.-w. grey. 10^-12 L. 



July, August. Central and Northern Europe, in wet meadows. Not un- 

 common in England; in Scotland it has not yet been detected, but possibly 

 has been passed over, from its resemblance to tristellus. From that species it 

 may be separated by its broader wings, pale mealy ochreous colour never in- 

 f uscated, and by the absence of the hind line. 



[Deliellus H. is allied to the last two species, but maybe distinguished by the 

 shortly pectinate antennas of the male, narrow, very pale ochreous front wings, 

 with a white line (margined with fuscous) from the base to the tip, the more 

 distinctly spotted hind-margin, and the whitish hind Mings. It occurs in dry 

 sandy places in Germany, &c, about the end of August. Luteellus S.V. occurs 

 in dry grassy places in June and July, in Central Europe. In the male the front 

 wings are somewhat broad, yellow, powdered with fuscous along the inner-mar- 

 gin, generally no trace of the hind line, and no fuscous spots along the hind- 

 margin ; the female has narrower pale grey front wings, dusted with fuscous, 

 and the veins a little paler; in both sexes there is no paler central vein.] 



4. Cilia not metallic. Front icing shining, unicolorous, or 

 suffused with darker along the veins. No lines. 



PEHLELLUS Scop. — Palpi long, whitish or grey. F.-w. 

 elongate, acute, hind margin rounded; shining; satiny-white, or 



