GEOMETRID.'E.— ALCIS. 187 



undulated streak : on the hinder margin of all the wings are some more or 

 less evident black conical spots, and on the disc of the posterior wings is a 

 white spot edged with deep fuscous or black. 



Varies slightly in colour, and in the intensity of the strigae. 



Caterpillar of a dirty brown-gray, with brighter stripes on the sides, and a deli- 

 cate spotted line on the back : it feeds on various plants, especially the poplar, 

 willow, honeysuckle, &c. :— the imago appears towards the middle of June. 



Taken occasionally in Coombe, Birch, and Darentli Woods, and 

 in Epping and Hainault Forests, as well as in the neighbourhood of 

 Brockenhurst. 



Sp. 7. Roboraria. Alls griseo-cinereis, atomis strigisque quatuor undatis suh- 

 interruptis fuscis, posticis lunula media fused. (Exp. alar. $ 2 unc. 2—3 

 lin. : 2 2 unc. 3—6 lin.) 



Ph. Roboraria. Fabricius.—Don. xv. pJ. 527. Al. Roboraria. Steph. Catal. 

 part u.p. 124. No. 6498. 



Pale griseous-ash, very thickly sprinkled with dark fuscous dots, the anterior wings 

 with four somewhat equidistant and much interrupted fuscous strigae, of which 

 the two central ones are nearly united on the inner margin, and form a con- 

 spicuous dark blotch ; the posterior wings have a fuscous lunule in the middle, 

 and three or four fuscous strigae, of which the one next behind the lunule is 

 most distinct and strongly dentate ; accompanying the hinder strigae of all the 

 wings is an undulated pale one, sometimes interrupted, and on the hinder 

 margin are a few more or less distinct black spots. 



Varies slightly in colour and in markings : in some individuals the striga? are 

 nearly obliterated, and the large dark patch on the inner margin of the ante- 

 rior wings is wanting : amongst these varieties the Al. piperitaria, Steph. 

 Catal. I. c. No. 649.9, has a place. 



Caterpillar griseous-brown, with an obscure dorsal line, each segment with a fus- 

 cous arch, and the three anterior with a yellowish spot: it feeds on the oak 

 and beech: — the imago appears towards the end of June. 



This magnificent insect has been several times caught in Birch 

 and Coombe Woods, but it is evidently rare near London ; in the 

 New Forest and near Brighton it appears to be more abundant. 



Sp. 8. rhomboidaria. Alts subfuscis atomis nehulisque saturatioribus, strigis 

 tribus subeommunibus nigris alterdque postica undulatd albd. (Exp. alar. 1 unc. 

 10—11 lin.) 



Ge. rhomboidaria. Wien. Ferz.—Al. rhomboidaria. Steph. Catal. part ii. p. 124. 

 No. 6500. 



Subfuscous ; the wings very thickly sprinkled with fuscous atoms, and slightly 

 clouded with the same hue, with three nearly common black strigae, of which 

 the middle one is somewhat angular and most distinct, approximating on the 

 inner margin towards the third, and forming a dark patch as in the foregoing 



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