LITHOSIID^. SETINA. 99 



anterior elongate, trigonate; posterior broad, slightly emarginate on the 

 hinder edge : legs not very stout : tibiae moderate, rather slender ; the pos- 

 terior with two pair of spurs. Females smaller than the males. Larva pilose; 

 pupa foUiculate. 



Setina differs from the other genera of the family by the semi-orbi- 

 culate-triangular form of the entire insect when displayed, arising 

 from the comparative brevity of the anterior and length of the poste- 

 rior wings: fromLithosia it may be at once distinguished by its triar- 

 ticulate palpi, and from Gnophria by the minuteness of the terminal 

 joint of the same organs, as well as from the lively yellow tinge 

 which adorns the wings, which are usually more or less spotted with 

 black. It is probable that the genus may require subdivision, as 

 the two first species evidently differ in habit from the third ; have 

 the palpi minute, and the wings subdiaphanous. I am not certain 

 whether the name above employed be correctly applied to the 

 present genus, not being aware of the type of Schreber's genus 

 Setina; but I used it in preference to coining a new term, as all 

 the species are included in that genus by Schrank. 



Sp. 1. irrorella. Plate 17. f. 1. Alls luteis, anticis punctis nigris trijariis, 

 thorace antice posticeque fulvo. (Exp. alar. $ 1 unc. — 1 unc. 3 hn.: ^ 9 Un. 

 1 — unc.) 



Ph. Ti. u-rorella. Linne.-Se. irrorella. Steph. Catal. pt. ii. p. 62. No. 6061. 



Antennae, legs, head, thorax, and abdomen black, the tip of the latter, the collar 

 and petagiae orange-yeUow ; the back with a large yellowish spot: anterior 

 wings of a clear orange-yeUow, with three transverse rows of black spots, 

 two of which are towards the middle ; and the third, somewhat irregularly 

 waved, on the hinder margin: cilia bright orange-yellow: posterior wings 

 pale orange-yellow, with two or three black spots towards the hinder margin 

 anteriorly. Female less, but similar. 



t Var. /3. Steph. Catal. I. c. The anterior wings with the two central rows of 

 spots united by black lines, forming the letters IVl very distinctly. 



Caterpillar black, with yellow dorsal and lateral stripes; it feeds on the common 

 Lichen, (Lichen parietinus), and changes to a red-brown pupa ; the imago 

 appears in June. 



An insect very irregular in its appearance, and excessively local ; 

 several specimens have been caught on Dartford-common, and 

 near Birch- wood. " Taken copiously near Rochester in 1816, and 

 the following year." — Rev. Professor Hensloio : — in whose col- 

 lection, which is now incorporated with that of the Cambridge 

 Philosophical Society's, var. /3. was contained. 



H 2 



