Manchester Memoirs, Vol. Iviii. (1914), No. 4. 5 



and a pinkish-buff, both having pearly white hind wings. 

 It is nocturnal, so far as my observations go, and during 

 the day is found resting in closely packed longitudinal 

 groups on the twigs and branches of small forest trees ; 

 the heads of the insects all point in the same direction. 

 The green form is considerably more abundant than the 

 buff coloured one, and only on two occasions I noticed 

 both forms on a branch together. In these two instances 

 they were intermixed and exhibited no definite arrange- 

 ment into the green forms above and the buff-coloured 

 examples below. I am not, however, prepared to assert 

 that this arrangement never occurs, and if Prof Poulton's 

 interpretation be correct, it must of necessity be rare to 

 come across such an occasion. It is to be hoped that 

 Indian entomologists will endeavour to clear up this 

 interesting feature, and the early part of July should be 

 the most likely time in the Himalayas to conduct observa- 

 tions. The insects bear a considerable resemblance to 

 leaf or flower buds just about to open, and the buff- 

 coloured examples appear very like unopened petals. 

 Out of seven colonies which I came across, all were dis- 

 posed along the middle or base of branches among the 

 foliage, and not at the apices of the twigs {PI. /., Fig. i, 

 and PI. II., Fig. 2). This fact rather mitigates against 

 the resemblance, though they closely harmonised with 

 the surrounding foliage. Whether the resemblance is 

 sufficient to deceive their enemies I am not in a position 

 to say. In this connection, however, it is noteworthy 

 that when individuals settled singly on leaves after being 

 dispersed, they were certainly more conspicuous to human 

 eyes than when grouped together on the twigs and 

 branches, Kershaw^ states that two species of the genera, 

 Salurnis and Geisha, closely allied to PJiromnia and found 



' "Notes on Plata" Journ. Bombay Nat. Hist. Soc, 1912, xxi., p. 609. 



