GEOMETRIDiE. XERENE. 249 



irregularly spotted with white, hehind this is a broad wliite space, in which 

 is generally a second row of black dots; the margins of all the wings are 

 black, with an undulated whitish line on the costa, a spear-shaped mark on 

 the middle of the inner edge, and two white dots at the anal angle : cilia 

 black interrupted with white: head and thorax black with small whitish 

 dots : abdomen black with white rings. 



Slightly variable ; the rows of black spots being sometimes wanting ; and the 

 fasciije a little variable in form. 



Caterpillar fuscous-brown, with lateral flexuous yellow lines; it feeds on the 

 birch : — the imago appears about the beginning of June. 



Rather scarce : I have taken a few specimens at Darenth-wood, 

 and at one particular hedge at Coombe-wood, near the ice-lionse, 

 a considerable number. " Allesley."^— 2?.ra. W.T. Bree. " Epping," 

 — Mr. Douhleday. 



Genus CCXI. — Xerene, Treitsclike. 



Palpi remote, not visible from above, very short, densely clothed with compact 

 scales; terminal joint slightly visible, acute; triarticulate, the two basal joints 

 stout, the first the most robust, terminal minute-ovate: maxilUv very long. 

 AntenncE slender, simple in both sexes, slightly pubescent in the males: head 

 small ; JbreAeflfZ rounded, promhient: eyes lateral, globose: thorax slender; 

 the latter with the head and base of the wings of a dark hue: the wingx 

 entire, rounded, more or less distinctly bordered with a deeper colour than 

 the ground, rarely with a central fascia ; the marginal band generally some- 

 what interrupted : abdomen rather long, slender in the males, with a shght 

 anal tuft, robust and obtuse in the females. Larva with 10 legs, robust, not 

 tuberculated, laterally spotted and streaked : pupa subterraneous. 



Xerene diifers from the foregoing genus by tlie structure and 

 proportions of the palpi, the forehead being more produced, the 

 wings being narrower and less distinctly bordered, the border more 

 or less spotted ; the head, thorax, and base of the anterior wings 

 are always of a dark hue, and the latter are rarely banded in the 

 middle. 



Sp. 1. albicillata. Alis lacteis, anticis bast maciduque costali piceo-mgris,Jim- 

 brique co7nmuni j)iumbed albido undulatd. (Exp. alar. 1 unc. 4—6 lin.) 



Ph. Ge. albicillata. Lmne.—Don. vi. pi. 202. /. 2.— Xe. albicillata. Sfeph. Catal. 

 part ii. p. 6593. 



Head, thorax, base of the abdomen pitchy-black; anterior wings milk-white; 

 the base the same, strigated with lead-colour and sinuated without ; towards 

 Haustellata. Vol. III. 30th June, 1831. s 



