122 HAUSTELLATA. — LEPIDOPTERA. 



entire, of plain nearly uniform tint; anterior elongate-triangularj without 

 stigmata, the hinder margin slightly rounded, its apex obtuse; posterior 

 rounded, slightly emarginated ; cilia rather short : legs slender, moderate ; 

 posterior simple. Larva and pupa unknown. 



The insects of this genus have their wings nearly destitute of 

 markings, being usually of plain uniform sombre tints, — hence the 

 name I have applied to them ; they may be known from the pre- 

 ceding genus by their somewhat elongated, obtuse anterior wings, 

 and the slight frontal crest, with the faintly pectinated antennse of 

 the males, and the short obliquely porrect palpi, with a minute ovate- 

 conic terminal joint in both sexes. The species which I have cap- 

 tured fly by twilight, but A. caliginosa is said to enjoy the sunshine. 



Sp. 1. lutescens. Alis anticis subunicoloribus sordide rufo-lutescentibus ad mar- 

 ginem crassiorem rufis; posticis subfuscis. (Exp. alar. 1 unc. 1 — 2lin.) 



Phy. lutescens. Haworth. — Ac. lutescens. Steph. Catal. pt. ii. p. 110. No. 

 6409. 



Anterior wings of a dull nearly concolorous reddish-clay, with the costa some- 

 what of a brighter red; the posterior pale fuscous; cilia of all rufescent, of 

 the anterior darkest. 



My specimen has the wings entirely of an ashy-clay, with a very faint red tint, 

 minutely irrorated with dusky, especially in the direction of the nervures ; the 

 ciUa slightly clouded with dusky at the apex. 



Two examples only of this species have come beneath my ob- 

 servation : one in the collection of Mr. Haworth, but of unknown 

 locality ; the other in my own, taken in Hampshire, near Lynd- 

 hurst, in July, 1821. 



Sp. 2. caliginosa. Alis anticis rufo autfusco grisescentibus strigis ohsoletis oh- 



scurioribus; posticis griseis. (Exp. alar. 1 unc. 1 lin.) 

 No. caliginosa. Hilbner.— Ac. caliginosa. Steph. Catal.pt. ii. p. 110. No. 6410. 



Ashy-brown; anterior wings of a fuscous or reddish-griseous, with two very 

 obsolete transverse dusky strigae towards the middle, the second shghtly 

 arcuated ; and towards the hinder an almost obliterated undulated one of a 

 paler hue; the hinder margin itself has a faint dusky line; cilia uniform 

 with the wings : posterior wings griseous ; ciUa fuscescent. 



In some examples the transverse strigae are more evident than in my specimen, 

 which is a female. 



A pair of this insect, in the collection at the British Museum, one 

 in that of Mr. Stone, and another in my own, complete the series 

 which have passed beneath my inspection : the two last-mentioned 



