The following sections appear to nie to be much more useful 

 than dividing this group into two genera on the mere outline 

 of the wings. 



A. Posterior tibiae armed with one pair of spurs. 

 * Superior wings denticulated. 



1. P. lacertinaria Z,mw. — Dow. 7. 251.2. — sc'mculaHub.Bomb. 



12. 50. — curvula Haw. and cultraria Lea. vars. 

 End of May, Birch-trees; " March 7th, 1801, in Mr. Li- 

 vius's garden, Bedford, Dr. Abbot;" Teignmouth, Captain 

 Blomer; Bere-wood, Dorset, Mr. Streatfield; June 30th, 

 Castle Eden Dene, Mr. Wailes. — cultraria, July 22nd, Elsing- 

 ton-wood, Dorset, Mr. Dale. Larva end of September on 

 Birch-trees. 



** Superior wings falcated but entire. 



2. falcataria Lhin. — Curt. B. E. pi. 555 S- — Sepp, v. 2. ^.12. — 



falcula Hub. 11. 44<. 



Middle of May, middle of June, and beginning of August, 

 Birch-wood; New Forest, Parley Copse, and Cranborne 

 Chace, Mr. Dale; Stover-woods, Devon, Capt. Blomer; and 

 Yorkshire. The beautiful specimen figured was taken, I be- 

 lieve, at Kinnordy by Mr. C. Lyell. The larva, an outline of 

 which is added, is found in August on the Birch, Alder, 

 Trembling Poplar, Sallow, and Oak. 



B. Posterior tibiae armed with two pair of spines. Maxillae 

 more developed and perfect. 



3. hamula Hub. 12. 4:6. <$-A'7.—Goda, 140. 3.— falcata i^a^.— 



sicula Sepp, v. 2. t. 16. 

 Middle of July, Oak-woods; flying in the day in Birch- 

 wood the middle of last May, Mr. J. Stand ish ; end of May 

 and beginning of June, Clapham Park Wood and Enborne. 

 Larva on Oak and Birch-trees. 



4. uncula Hub, 12. 45. 



Indicated in the Syst. Cat. as a var. of the foregoing, but I 

 know no reason for considering it as such, neither am I aware 

 of any British specimen existing in our Cabinets. Haworth 

 refers with doubt to the above figure as synonymous with 

 Mr. Swainson's Insect. 



5. unguicula Hilb. 12. 48. — Goda, 140. 4. — sicula Esp. 

 June, Richmond Park : Mr. B. Standish says the males fly 



about like Orgyia antiqua (fol. 378) ; near Beech, New Forest, 

 beginning of May, and at Glanville's Wootton and Middle- 

 marsh end of May and beginning of June, Mr. Dale. Larva 

 on Oak, Beech, and Black-thorn. 



6. fasciata Step. — uncula Haw. 

 Taken in England by Mr. Swainson. 



The Plant is Arbutus Uvaursi (Bearberries) in fruit, with an 

 outline of the flower. 



