AND THEIR TRANSFORMATIONS. 71 
PERIDEA*, Srepnens. NOTODONTA, p., Bov., Curtis, Ocusrnn. 
LPI LP IPD, 

This genus has a prominent lobe on the hind margin of the fore wings, which are entire on the outer margin, 
and squamose ; but not so opaque as in the next genus. The antenne are serrated and bipectinated in the males. 
It bears considerable resemblance in form and in the markings on the anterior margin of the hind wings to 
Stauropus, but the caterpillar more nearly resembles that of Petasia (with which it agrees in its sprawling habit 
and stripes), and Chaonia, which, like it, has no anal tubercle; in which respect it also differs from Endromis, 
with which, however, it agrees in its oblique lateral markings. 
y) ? fo) oO 
SPECIES 1.—PERIDEA TREPIDA. Puare XIV., Fie. 9, 10. 
Synonymes.— Bombyx trepida, Fabricius; Ochsenheimer ; Esper ; Phalena Tritophus, Donovan; Haworth; but not of Fabricius 
and Wien. Verz. (which is the Torva of Hiibner, but not of Ochsen- 

Curtis; Boisduval (but not of Donovan, Leach, &c., which is Leio- 
campa dicteza). heimer). 
Bombyx tremula, Wien. Verz.; Hiibner (but not Linneus, | Bombyx Chaonius, Schrank ; but not of Hiibner and Wien. Verz. 
which is Leiocampa ‘dictea). Bombyx serrata, Thunberg ; Stephens (Peridea serr.); Wood, Ind. 
Ent. tab. 6, fig. 37. 
This species, the largest of all our Prominents, varies from 2 to 24 inches in the expansion of the fore wings, 
which are clouded with grey and ashy-brown, with a central red-brown lunule edged with greyish ; there are 
two transverse irregular dark stripes before the middle of the wing ; a third much angulated and nearly obsolete 
streak, followed by two dark lines near the tip, and a row of oblong spots towards the outer margin, which is 
marked with dark lunules. The hind wings are yellowish white, more fulvous towards the body, with the outer 
margin greyish. 
The caterpillar is pale green, with several yellow dorsal lines, and a series of short oblique lateral ones. It 
feeds on the oak in August and September, and the moth appears in May and June. It is a rare species, occurring 
in the woods round London, as well as in Norfolk. 

DRY MONIA+, Hisner. (CHAONTA, Sreruens.) 
Perr 

eae 
This group, which Boisduval unites with Notodonta, has the fore wings opaque, and but very slightly lobed on the 
hind margin ; the outer margin is entire ; the thorax is scarcely crested ; the antenne in the males bipectinated, 
and nearly simple in the females; the palpi are short; the abdomen of moderate length. The caterpillars are 
naked, entire, and without a conical prominence at the extremity of the body. 

SPECIES 1.—DRYMONIA DODONZA. Puare XIV., Fie. 11. 
Synonymes.— Bombyx dodonea, Wien. Verz. ; Hiibner; Haworth ; | Bombyz trimacula, Esper ; Donovan, 10, pl. 352, fig, 2. 
Wood, Ind. Ent. pl. 6, fig. 35; Curtis, Brit. Ent. pl. 755 (Dry- Bombyz tripartita, Borkhausen. 
monia d.), Bombyx ilicis, Fabricius. 
This variable species measures from I+ to 1S inches in the expansion of the fore wings, which are of a pale 

* Derived from the Greek, in allusion to the tremulous movement of the caterpillars when alarmed. 
+ Derived from the Greek, in allusion to the habitat of the insects in oak groves. 


