196 HAUSTELLATA. — LEPIDOPTERA. 



females obsoletely serrate beneath, and slightly pilose : head small : eyes 

 globose : thorax slender, velvety : wings partially extended during repose, the 

 hinder margin of all entire and somewhat rounded, all finely pulverulent, and 

 traversed with simple darkish strigse on a white or ashy ground : abdomen 

 slender, stouter and rather acute in the females. 

 Larva slender, smooth, with two slight spines on the last segment ; the head 

 large, rounded : pupa formed in a foUiculus among leaves. 



In form the insects of this genus considerably resemble the Nu- 

 merise, but exclusively of the great diversity in colour (the Caberse 

 being white or snowy, with minute pale ashy irrorations and simple 

 darker strigse), the form and structure of the palpi and of the an- 

 tennae, their metamorphosis is different : — all the species appear 

 also to be double-brooded, appearing first about May, and a second 

 time in August. 



Sp. 1. pusaria. Alis niveis cinereo-subatomosis, anticis strigis trihus medio 

 cequidistantibus subundulatis, posticis duabus cinereis. (Exp. alar. 1 unc.2 — 4 

 lin.) 



Ph. Ge. pusaria. Linne. — Ca. pusaria. Steph. Catal. part n. p. 126. No. 6514. 

 Albin, pi. xcviii.y. e—h. 



Snow-white ; wings faintly speckled with pale cinereous ; the anterior with three 

 slightly undulated, equidistant, dark cinereous or plumbescent strigae in the 

 middle ; posterior with two, corresponding with the two outer ones on the 

 anterior wings: cilia pure immaculate snow-white. 



Rather variable: in some examples the strigfe are not equidistant, the central 

 one sometimes approximating to the anterior and occasionally to the posterior 

 one; and in other instances one or more of the strigse is deficient, and in some 

 cases aU are obliterated. 



Caterpillar slender, pale greenish, with a row of red dots down the back : it 

 feeds on the hazel, willow, alder, birch, &c. :— the imago is double-brooded, 

 appearing in May and August. 



Extremely abundant in all the woods and copses within the me- 

 tropolitan district ; and not uncommon in other parts of the country. 

 « Alderley, Cheshire."— i?gt;. E. Stanley. " Epping."— il/r. 

 Doubleday. " Baron and Black Hall Woods."— 7". C. Heysham, 

 Esq. " Weston-on-the-green.'" — Rev. A. H. Matthews. 



Sp. 2. rotundaria. Alis rotundatis niveis, fuscO'Subatomosis, strigis duabus 

 medio communibus subundulatis plumbescentibus, anticd anticarum geminatd. 

 (Exp. alar. 1 unc. 1 — 3 lin.) 



Ge. rotundaria. Haworth. — Ca. rotundaria. Steph. Catal. part \\. p. 126. iVo. 

 6515. 



