CEMIOSTOMA. 287 
leaf-miners, forming flat blotches in the leaves; that of C. sparti- 
Joliella however has a different habit, mining under the bark of 
the stems of broom. 
The genus may be thus divided :— 
a. Anterior wings white. Species 1, 2. 
a a. Anterior wings leaden-grey. Species 3. 
The first two species are so similar in the perfect state as to be 
hardly distinguishable ; (another white species frequenting aspens, 
and a leaden-grey species frequenting Hypericum, occur on the 
continent.) 
1. spartifoliella, Hiib. Tin. 335 (1816); Step.; Dup.; Zell.; 
Sta.—punctaurella, Waw.—Harrisella, Linn.? lis anticis albis, ma- 
cula coste pone medium dilute flava fusco-marginata, macula altera 
costz apicem versus lateribus converyentibus, macula atra violaceo-pu- 
pillata ad angulum analem, striis tribus fuscis per cilia radiantibus. 
Exp. al. 3} lin. 
Head and face white. Antenne fuscous, the tip and basal joint 
white. Anterior wings white; on the costa beyond the middle is a 
pale yellow spot obliquely placed, pointing towards the anal angle, and 
margined on both sides with fuscous; towards the apex is another 
spot on the costa placed more perpendicularly, its converging sides are 
margined with fuscous; below it is a black spot with a violet pupil; 
the apex of the wing is yellow, with a small fuscous spot; cilia white, 
with three dark fuscous streaks, one towards the costa, one to the ex- 
treme apex, and the other, originating at the same point, drooping. 
Posterior wings white, with white cilia. 
Abundant from the middle of June to the end of July, among 
broom. ‘The larva feeds in the spring under the bark of broom, 
making long, nearly straight galleries; when full-fed it emerges 
from its subcortical burrow, and spins its snow-white cocoon on 
the stem, under the shelter of a projecting bud. The cocoons 
may be advantageously collected at the beginning of June. 
2. Laburnella (v. Heyden); Sta. Sup.-Cat. p. 11 (1851).  Alis 
anticis albis, macula costee pone medium dilute flava fusco-marginata, 
macula altera costz apicem versus, /ateribus parallelis fusco-marginatis, 
macula atra violaceo-pupillata ad angulum analem, striis tribus fuscis 
per cilia radiantibus. Exp. al. 34 lin. 
Head and face white. Antenne fuscous, the tip and basal joint 
white. Anterior wings white; on the costa beyond the middle is a 
pale yellow spot obliquely placed, pointing towards the anal angle, 
margined on both sides with fuscous; towards the apex is another 
yellow spot on the costa placed more perpendicularly, its parallel sides 
are margined with fuscous; below it is a black spot with a violet pupil ; 
the apex of the wing is yellow, with a small fuscous spot; cilia white, 
eee 
