GEOMETRID-'E. — ALCIS. 185 



Extremely variable in colour and in the intensity of its markings : in some in- 

 stances the strigae are nearly obliterated; at otliers they are remarkably distinct, 

 black, and somewhat fasciseform ; and in the exterior angle of the second 

 repanded striga is frequently a quadrate dark spot. 

 Caterpillar ashy-gray, with a darker line on the back and paler spots, and some 

 black dashes : it feeds on the poplar, birch, &c. :— the imago appears towards 

 the middle or end of July. 



Not uncommon in woods and forests in most parts of the king- 

 dom, especially in the New Forest. — " York, Newcastle." — W. C. 

 Hewitson, Esq. " Baron-wood, Armathwaite." — T. C. Hey sham, 

 Esq. " Epping," — Mr. Douhleday. " Weston-on-the-green." — 

 Rev. A. H. Matthews. 



Sp. 2. destrigaria. Alls omnibus griseo-cinereis prasatomosis nehulosis, strigd com- 

 muni posticd repandd albd, intus cinered. (Exp. alar. 1 unc. 11 lin.) 



Ge. destrigaria. Haworth.—k\. destrigaria. Steph. Catal. part ii. p. 124. No. 6493. 



Pale griseous-ash, rather thickly irrorated with fuscous, and clouded with the 

 same, with a white repanded undulated striga on both wings, towards the 

 posterior margin, bordered within with cinereous. 



Differs from the preceding by being paler, more thickly irrorated with fuscous, 

 and by wanting the fuscous strigse in the middle of the wings : it may pro- 

 bably be a mere variety of the former. 



Found near London in woods in July. 



Sp. 3. muraria. Cinereo-fuscis, atomis innumeris strigisque obscuris satura- 

 tioribus. (Exp. alar. 1 unc. 8—9 lin.) 



Al, muraria. Curtis. — Steph. Catal. part ii. p. 124. No. 6494. 



Of an uniform gray-brown, very thickly sprinkled throughout with fuscous, 

 with two very obsolete and one rather distinct darker striga; on the anterior 

 wings, the latter a little beyond the middle ; and two on the posterior more 

 evident towards the inner margin : there is also a very faint pale flexuous 

 striga near the hinder margin, and on the extreme edge of the latter is an 

 interrupted black line. 



Specimens vary a little in colour, but all are of a more uniform colour, with 

 the markings less evident, and of smaller size than either of the foregoing 

 specimens. 

 Taken in the north of England and in Scotland on old walls, not 



uncommonly. 



Sp. 4. conversaria. AUs cinereo-griseis, fusco-atomosis, fascid lata communi 

 nigricante obtuse biangulatd. (Exp. alar. 1 unc. 10 — 11 lin.) 



Ge. conversaria. Hilbner. — Entomological Transactions, i. 328. pi. 9. /. 3. — 

 Al. conversaria. Steph. Catal. part ii. p. 124. No. 6495. 



Griseous ; wings somewhat cinereous, delicately sprinkled with minute fuscous 

 Haustellata. Vol. III. 31st May, 1831. o 



