1865.3 , 151 



I have seen but one specimen of this extraordinary species. In 

 all the others the superior wings are oval, the apex scarcely acute, but 

 in A. caudatwm they are prolonged into a sort of tail. The colours are 

 very bright, and the markings very pretty. Probably it will be advisa- 

 ble eventually to place A. caudatum in a distinct genus. I propose the 

 name Syllysis. 



Genus Peeientomum, new genus. 



Stiperior wings. Sub-costa giving off an oblique branch towards 

 the anterior margin ; median vein furcated in the middle, after giving 

 off a branch (3) towards the posterior margin, ending in an elongated 

 fork ; superior branch (1) touching the sub-costa in such a manner 

 that the end of the latter seems to be a prolongation, ending in an acute 

 fork ; by an oblique transverse vein uniting the median and sub-costa 

 soon after the commencement of the third branch, and afterwards by 

 the point where this branch touches the sub-costa, is formed an elongated 

 areole, acute at both ends ; inferior branch (2) ending in an acute fork, 

 but after having emitted a simple posterior branch. 



Inferior wings. Sub-costa rudimentary ; median vein apparently 

 double up to the point where it gives off the simple branch (3) to the 

 posterior margin (or rather this branch commences at the base of the 

 wings, and unites with the median by a short transverse vein) ; after- 

 wards the median vein furcates, the two branches forming two forks, 

 but the superior branch (1) commencing from the fork of the inferior 

 branch (2) emitting a transverse vein to the posterior margin. 



Otherwise as in Amphientomtmi. 



1. — P. trichopteryx, (Nietner M.S.) Hagen. 



AmpUentomum trichopteryx, Verhand. Zool.-bot. Gesell., Wieu 1859, 

 p. 205. 



Head yellow, pubescence concolorous; palpi yellow, the apical 

 joint black; antennae yellow, 22-jointed; ocelli somewhat distant; 

 thorax brown ; superior wings covered with brown and silvery scales 

 prettily intermingled ; inferior wings transparent grey ; legs brown, 

 femora internally pale, covered with scales. Pemales with a brown 

 ovipositor. Males with the head browner, yellow on the sides, especially 

 near the occiput ; legs slightly paler ; inferior wings sometimes almost 

 entirely pearly-grey, in consequence of the more numerous silvery 

 scales. 



Long cum alis 4 mill. ; exp. alar. 7i mill. 



Ceylon : Eambodde (Nietuer), in woods. 



