■ AND THEIR TRANSFORMATIONS. 71 



PERIDEA*, Stephens. NOTODONTA, p., Bdv., Curtis, Ochsenh. 



This genus has a prominent lobe on the liind margin of the fore wings, which are entire on the outer margin, 

 and squanioso ; but not so opaque as in the next genus. The antenna are serrated and bipectinated in the males. 

 It bears considerable resemblance in form and in the markings on the anterior margin of the bind 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. 



SPECIES 1.— PERIDEA TREPIDA. Plate XIV., Fw. 9, 10. 



Synonymes. — Bombyx trepiJa, Fabricius ; Ocbscnheimcr ; Esper ; I Phal(£na Tritophus^ Donovan ; Haworth ; hut not of Fabricius 

 Curtis ; Boisduval (but not of Donovan, Leacb, &c., which is Leio- and Wieu. Vei?.. (wliich is the Torva of HUbner, but not of Ochsen- 

 canipa dicta;a). hciincr). 



Bomhyx tremula, Wien. Vera. ; Hiibncr (but not Linnjcus, 

 which is Lciocanipa'dictjca). 



Bomhyx Chaonius, Schrank ; but not of Hiibner and Wien. Vera. 

 Bomhyx serrata, Thunberg; Stephens (Peridea scrr.) ; Wood, Ind. 

 Eut. tab. (j, fig. 37. 



This species, the largest of all our Prominents, varies from 2 to 2i inches in the expansion of the fore wings, 

 which are clouded with grey and ashy-brown, with a central red-brown lunule edged with gi'eyish ; there are 

 two transverse irrctmlar 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. 



DRYMONIAt, Ili'BNEK. (CHAONIA, Stephens.) 



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 antennas in the males bipectinated, 

 and nearly simple in the females ; the pali)i 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 DODON^A. Plate XIV., Fig. 11. 



Synonymks.— Bomi!/x dodouoea, Wien. Vera. ; HUbner; Haworth ; I Bombyx trimacula, Esper ; Donovan, 10, pi. 352, fig. 2. 

 Wood, Ind. Ent. pi. 6, tig. 35; Curtis, Brit. Eut. pi. 75S (Dry- Bombyx tripartita, Box\.h2M%tn. 



■ ,\ Bombijx ilicis, Fabricius. 



monia d.^. ' ^ ' 



This variable species measures from IJ- to U 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, 

 t Derived from the Greek, in allusion to the habitat of the insects in oak groves. 



