NOCTUID^. THYATiRA. 47 



Whether there be two species confounded together under the 

 above name, as separated in my Catalogue, the rarity of this 

 beautiful species in Britain does not allow me to decide; but cer- 

 tain it is that the splendid jfigures of Sepp are widely different from 

 those of the Papillons d'Europe ; the larva having but three large 

 ochraceous patches on the back, and the imago being very much 

 spotted throughout with black, in the latter work. Near London 

 a few examples have occurred at Birch-wood, and others have 

 been taken in the west of England and near Ipswich during the 

 past year: — Var. a. " Oakhampton-park, Somersetshire." — Dr. 

 Leach. Var. (3. " Woodlands, near Plymouth." — Dr. Leach. 



Genus CXXVI. — Thyatira, Ochsenheimer. 



Palpi distant, obKquely porrected, the two basal joints clothed with very long 

 hairy scales, the terminal exposed, short, obtuse ; the basal joint shorter than 

 the apical, more slender than the second, and sUghtly bent, the second elon- 

 gate, robust, a Uttle attenuated towards the apex, terminal slender, elongate- 

 ovate: maxiUce rather short. Antenna ^oxt, rather stout, pubescent within 

 in the males, somewhat slender in the females: head rather broad; eyes 

 globose, naked: thorax transversely crested: abdomen slender, slightly re- 

 flexed on the sides, which are tufted, the apex with a smaU tuft in the 

 males: wings deflexed, entire; antej-ior obtuse, broad, somewhat acumi- 

 nated at the apex, without the ordinary strigae ; posterior ample. Larva naked, 

 gibbous anteriorly : pupa folliculated. 



The comparatively robust thorax of the Thyatirse, M'hich is 

 covered with light silky hairs, forming a transverse crest, and the 

 superior robustness and brevity of the antennae, at once distinguish 

 this genus from the preceding, and the obtuseness of its anterior 

 wings from the following, to which it seems somcM^hat allied. 



Sp. 1. derasa. Alis anticis basi siliceis, medio fulvo albidoque variegatis, fasciis 

 duahus alhis, postice convergentibus. (Exp. alar. 1 unc. 6 — 8 Un.) 



Ph. No. derasa. Linne. — Don. vii. pi. 223. f. 1.— Th. derasa. Steph. Catal. 

 part ii. p. 94. No. 6296. 



Head pale griseous; thorax griseous, with white and hoary shades: anterior 

 wings with a large pale fuscous patch at the base, appearing as if destitute 

 of scales, at the base of which arises an oblique slender white line, which 

 imites, at a right angle near the costa, with a similar oblique hne arising 

 nearly at the base of the costa, and passing to the inner margin of the wing 

 a little behind the middle ; from the anal angle a third and more distinct 

 one arises, nearly at right angles with the second, and terminates at the apex 

 with a slight curve ; between these two last fasciae the space is varied with 



