OPOSTEGA. 289 
lanceolate ; anteriores: cellula nulla, venis guatuor longitudinalibus 
simplicibus; posteriores: vena mediana in tres ramos divisa. 
Head in front with rather erect hairs, at the back smooth. Antenne 
shorter than the anterior wings, the eye-cap of the basal joint large. 
Labial palpi short, drooping. © Anterior wings slightly pointed, not 
caudulate, the posterior narrow, lanceolate. In the anterior wings 
there are only four simple longitudinal veins, thus no discoidal cell. In 
the posterior wings the median vein divides into three branches. 
Little is yet known of the habits of the insects of this genus, 
and the larvee of none have yet been discovered. We have only 
three British species, which are readily distinguished. 
1. salaciella, Treit. E. 5. ix. 2. 180 (1833); Dup.; Zell.; Sta. 
Alis anticis émmaculatis albidis. Exp. al. 5 lin. 
Head and face whitish. Palpi white. Antenne pale fuscous; basal 
joint whitish. Anterior wings immaculate, whitish, having a faint 
yellowish tinge; cilia white. Posterior wings pale grey, with whitish 
cilia. 
Occasionally met with among grass in June and July; I have 
‘taken it at Dartford Heath. 
2. auritella, Hiib. Tin. 387 (1816); Zell.; Sta. Alis anticis 
albis, macula in medio dorsi oblique posita fusca, striolis tribus cost, 
duabus dorsi adversus punctum apicis atrum convergentibus. Exp. al. 
44 lin. 
Head white. Face whitish. Palpi white. Antennz pale fuscous ; 
basal joint white. Anterior wings white, with a fuscous spot on the 
middle of the inner margin obliquely placed, pointing towards the apex 
of the wing; at the apex is a black spot, from which arise three short 
fuscous streaks towards the costa, two towards the inner margin, and 
two in the whitish cilia. Posterior wings grey, with paler cilia. 
In the collections of Mr. Shepherd and Mr. Waring; the spe- 
cimens were taken in the Cambridgeshire fens in June. 
3. crepusculella (I. v. R.), Zell. Isis, 1839, p. 214; Id. L. B. 
iii, 284. ii, pl. 2. f. 41; Dup.?—auritella, Step. Alis anticis albis, 
strigula parva dorsi ante, strigula majore costa pone medium fuscis, 
strigulis duabus parvis coste apicem versus fuscis, puncto apicis atro. 
Exp. al. 4 lin. 
Head white. Tace whitish. Palpi white. Antenne white, annu- 
lated with fuscous; basal joint white. Anterior wings white; on the 
inner margin a little before the middle is a small fuscous streak, ob- 
liquely placed, pointing towards the apex of the wing; beyond it is a 
broader fuscous streak on the costa pointing towards the anal angle; to- 
wards the apex of the wing are two fuscous streaks on the costa, and 
at the extreme apex is a black spot; cilia white, with two fuscous 
transverse streaks, one on each side of the apical black spot. Posterior 
wings grey, with paler cilia. 
VOL. III. 2P 
