

104 BRITISH MOTHS 
in the shape of its triangular wings, but also in the form of its short thick larva. The median vein emits 
four branches. 
Boisduval unites the type with rosea, forming them into his fourth section of Lithosia. The differences, 
however, between mesomella and rosea appear to warrant their generic separation. 
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SPECIES 1.—CYBOSIA MESOMELLA. Prater XX., Fie. 25. 
Synonymes.—Phalena (Tinea) mesomella, Linneus; Turton ; Lithosia eborina, Fab. ; Hiibner; Ochsenheimer; Stephens ; 
Boisduval. Haworth ; Wood, Ind. Ent. pl. 8, fig. 109. 
Lithosia lutarella, Haworth (variety). 
This species measures from 3 to 1; inch in expanse. The head, fore and apical margins of the fore wings, 
and cilize of all the wings, are luteous ; the remainder of the fore wings pale-dove coloured or yellowish, each 
with two small black spots, the hind wings are brown ; and the remainder of the body is whitish. The caterpillar is 
thick, and of a grey colour, with a reddish head. The moth appears in June and July, and is not rare in the 
wools round London. 
PHILEA Daman. (Zerrerstept. SETINA, p. Srepuens. ) 
This genus is at once distinguished by the semitransparency of the short, triangular, yellow-coloured wings ; 
the palpi are three-jointed, but minute ; the antennz are setaceous and simple in both sexes, being, however, 
slightly ciliated in the males; the spiral tongue is moderately long. The caterpillar is short and thick. 
The females are smaller than the males. 

SPECIES 1.—PHILEA IRRORELLA. Puate XX., Fie. 22, 23, 24. 
Synonymes.—Phalena (Tinea ) irrorella, Linn. ; Turton. | Til, vol. 2, pl. 17, fig. 1 ; Wood, Ind. Ent. pl. 8, fig. 107 ; Zetterstedt 
Eudrosa irrorella, Hiibner, Verz. bek. Schm. | (Phileai.). 
Bombyx irrorea, Hiibner; Ochsenheimer; Godart; Stephens, | Lithosia irrorata, Fabricius ; Haworth. 
This pretty insect varies from 3 to 1} imch in expanse. The wings are of a luteous colour, the anterior 
marked with three rows of small black dots placed obliquely across the wings ; the body is black, with the 
thorax in front and the extremity of the body fulvous; the hind wings are also marked, near the outer angle, 
with two or three black dots. A singular variety, having the black dots transformed into marks resembling 
the letters IVI, was captured by Professor Henslow. The caterpillar is described by Zetterstedt as black and 
hairy, with rhomboidal, dorsal, and oblong lateral spots of a pale colour, and as feeding upon lichens. The 
moth appears in June and July, and is a rare species, although it has occasionally been taken in some plenty in 
the South of England. 

SPECIES 2.—PHILEA ROSCIDA? 
Synonyaes.—Lithosia roscida, Fabricius ; Hiibner ; Stephens; Wood, Ind. Ent., pl. 8, fig. 108. 
This species varies from $ to an inch in expanse, and appears to be very closely allied to the preceding, from 
which, however, it is regarded as distinct by Ochsenheimer, Boisduval, &c. The body is black, with the front 
of the thorax and tip of the abdomen luteous ; the fore wings are of a dull-pale clay colour, with three rows of 
black spots; and the hind wings have several dusky dots near the outer angle; the shaft of the antennze 
is black; the four fore legs are blue-black above, and yellow beneath. Taken, but very rarely, near 
Croydon, Surrey. 

