6 HAL'STELLATA. LEl'IDOPTERA. 



between the antennjE, scarcely forming a crest : e^/e* moderate : wings placed 

 horizontally during repose ; anterior with the hinder margin entire, slightly 

 repanded, and falcate towards the apex; posterior entire; the former varied 

 with irregular dark lines, or marked with two simple paler streaks, the space 

 between being generally darker than the rest of the wing: legs rather short, 

 intermediate and posterior tibicE with a pair of spurs at the apex, or the 

 latter sometimes with a second pair towards the middle. Larva lacertiform, 

 slightly attenuated in front, with the back gibbous, and considerably atte- 

 nuated posteriorly : pupa folliculated. 



The insects which I have associated in my Catalogue under the 

 general name Drepana evidently belong to two separate groups : the 

 first of wliich corresponds with Syssaura of Hiibner, and the other 

 with Drepania of the same author: they may all be known by their 

 falcate anterior wings, combined with the integrity of the hinder 

 margin : the more deeply pectinated antennae of the males also serves 

 to distinguish that sex : — in addition to the diversity of structure in 

 the posterior legs between the two sections, it may be stated that in 

 the first the antennae of the females are slightly bipectinated, and in 

 the second they are simple. 



A. Posterior tibice with one pair of spurs only. — Syssaura, Hiibner. 



Sp. 1. falcataria. Alts ochraceis aut griseis, anticis saturatioribus undis nu- 

 merosis strigdque posticCi ustulatis, macula pun din que duabus in medio fusces- 

 centibus. (Exp. Alar. 1 unc. 3 — 7 lin.) 



Ph. Ge. falcataria. Linnc. — Dr. falcataria. Steph. Catal. pt. ii. p. 156. No. 

 6751. 



Wings ochraceous or pale griseous, with numerous dark umber waves; 



anterior pair darker, with a deep umber streak towards the apex, a patch 



of brownish on the disc near the costa and two small dark spots nearly ad- 



joinhig. 

 The wings are sometimes of a pale ochry-white, with the usual waved 



marks. 

 Caterpillar with the head brownish-yellow, the mouth, sides, and legs green, 



the back reddish-brown, with dusky spots and a pale reddish lateral line; it 



feeds on the birch, alder, aspen, oak, willow, &c. in September : the imago 



appears towards the end of May or beginning of June. 



Occasionally found in the woods about London, as at Coombe, 

 Darenth, and Birch-wood: it is also found at Hertford and 

 Kipley, and in Yorkshire. " Epping.''-— J/r. H. Douhleday. 

 " Alderley, Cheshire."— Jita-. E. Stanley. " Baron Wood, Arma- 

 thwaitc, hcr^T. C. Hcysliam, Etsq. 



