SWAMMERDAMIA. 55 
of small birds. 8. apicella and S. Pyrella appear in the first 
burst of spring, and are indelibly associated in the mind of the 
collectors with those few warm days at the end of April, ‘too 
bright to last.” ‘The other species do not appear till considerably 
later; probably all, with the exception of §. apiced/a, are double- 
brooded. The larve of this genus are long and slender (espe- 
cially anteriorly), with sixteen feet, and reside singly in webs on 
the upper surface of the leaves of hawthorn, apple, pear, birch, 
etc. hey are easily frightened from their place of abode, and 
readily descend to the ground by their silken threads; when full- 
fed they spin rather dense cocoons of very fine white silk. ‘The 
five British species are all rather closely allied. 
1. apicella, Don. B. I. ii. pl. 57 (1792).—comptella, Hiib. ; Step. ; 
Zell. ; H.-S.—compta, Haw.—aurofinitella, Dup. Alis anticis albidis 
griseo-ochreisve, squamis fuscis in seriebus longitudinalibus dispositis, 
macula costae ante apicem albida, apice ochreo interne fusco-marginato. 
Exp. al. 8 lin. 
Head and face white, with a few grey hairs. Palpi dark grey; ter- 
minal joint white. Antenne dark grey. Anterior wings white or 
greyish-ochreous, with the extreme base dark ochreous ; along the dise 
are several longitudinal rows of dark fuscous scales; a spot on the 
costa before the apex is whitish; the entire apex of the wing is bright 
ochreous, margined internally by some dark fuscous scales ; cilia dark cop- 
pery-grey, at the anal angle pale grey. Posterior wings pale grey, with 
paler cilia. ; 
This insect appears at the end of April and beginning of May ; 
not uncommon in mixed hedges in the south of Hngland. 
2. Ceesiella, Hiib. 172 et 360 (1801 et 1816); Lienig; H.-S. 
—Heroldella, Treit.; ¥. v. R. pl. 13; Dup.—lutarea var. y, Haw.— 
lutarella, Step.? Alis anticis griseis, atomis fuscis in sericbus longi- 
tudinalibus dispositis, dorso albido, macula dorsali saturate fusca ante 
medium, plicam non transeunte, nebula saturate fusca paullulum poste- 
riore, macula parva costz saturate fusca apicem versus, inter squamas 
albas posita; alis posticis dilute griseis ; capillis ali salbidisve. Exp. 
al. 6 lin. 
Head and face white or whitish. Palpi dark grey, tip of the ter- 
minal joint white. Antenne with the basal joint white, remainder grey. 
Anterior wings grey, with a slight violet tint, with several longitudinal 
rows of fuscous atoms; the inner margin is whitish, interrupted before 
the middle by a dark fuscous spot, which does not cross the fold ; rather 
beyond this, towards the costa, is an obscure dark spot; a small dark 
fuscous spot lies on the costa before the apex, and is preceded and fol- 
lowed by some whitish scales; below the latter are some black scales, 
forming a short streak, and at the extremity of the fold are a few dark 
