GEOMETRID^. ACIDALIA. 309 



Wings purplish-red, with three dark purplish-brown strigse ; the two first slightly 

 curved, the third a little undulated, and between the last and the hinder 

 margin is a very obscure r\idimentary pale waved striga, visible only in certain 

 lights ; cilia yellowish-red. 



Antennae of the male rather strongly ciliated : — probably more allied to the 

 following genus than to the present. 



One specimen was taken near Dover, I think, in 1825. I possess 

 one that was subsequently captured near York. 



Genus CCXXXVI.— Acidalia, Treitsclike. 



Palpi very short, slender, sparingly clothed with scales, acute, triarticulate; the 

 basal joint long, curved ; the second shorter, subattenuated ; terminal oblong- 

 ovate, rather broader than the apex of the second : maxillcE long. Antennae 

 slender, simple in both sexes, more or less slightly ciliated in the males : head 

 small : forehead depressed : eyes large, globose : thorax very slender : wings 

 entire, partially expanded during repose, of an uniform colour, mostly tra- 

 versed with fine waved lines, varying from three to five in number, and the 

 disc usually with a darker central tint : legs moderate 5 posterior tibia; some- 

 times incrassated, with a fasciola of hairs within, sometimes spurless, at others 

 with one or two pair; posterior tarsi sometimes very short, almost obsolete, 

 at others rather long. 



The neat insects of this genus have the posterior tibiae in some 

 measure resembling those of Ptychopoda, but the fan is less deve- 

 loped : they are generally destitute of spurs in the males, and the 

 females have two or four, but the former sex never more than two : 

 from the foregoing genus this may, however, be known by the 

 superior elongation of the wings, which have generally from three 

 to five transverse strigge thereon, with the hinder margin usually 

 clear. 



A. Posterior tibiae of the males without spurs, of the females with one pair at 



the apex. 



Sp. 1 . osseata. Alis Jlavescentibus, obscurius undatis, puncto medio nigro, anticis 

 costdferrugined. (Exp. alar. 9—9^ lin.) 



Ph. Ge. purpurata. Linne.—Turton( ! )—Era. purpurata. Steph. Catal. part ii. 



p. 149. No. 6698. note. 

 Wings greenish, with the margin purplish ; anterior with two broad purplish 



fasciae, the first short, the second longer, beneath deep yellow with a purplish 



streak towards the apex : posterior yellow on both sides ; beneath with a large 



purplish blotch. 

 Indicated by Turton to be indigenous : what the insect is I am not aware. 



