( 29 ) 



a very slight tendency towards this indentation in the black 

 hind-marginal border. This common Chalcosid flies slowly and 

 for short distances in open sunny places, and settles on the 

 upperside of leaves ; it is abundant, though, of course, not to 

 be met with in anything like the numbers that may be seen of 

 T. hecabe anywhere in Sarawak. It settles with fore-wings 

 folded over the hind-wings, presenting a flat surface, so that 

 the Aeea&e-pattern is conspicuous. For the theory of mimicry 

 between these two species it is, of course, unfortunate that the 

 Pierine invariably settles with wings closed and erect, nor does 

 this Pierine, when settled, open and close its wings slowly, so 

 that one can see the upperside pattern, as do some of the Papi- 

 lios, e. g. P. agamemnon. But in flight there is no doubt that 

 the moth is sufficiently like the Pierine to be mistaken for it. 

 lxxvi] 



" Terias hecabe can be seen frequently in closely packed 

 'flocks' of 50 to 100 individuals settled on damp spots by 

 the side of many rivers in Sarawak, and they should form an 

 easy prey to any bird or insect enemy ; but although I have 

 often watched them thus settled together with other larger 

 brilliant yellow Pierines, I have never seen them attacked ; 

 and when disturbed, instead of dispersing and flying away, 

 they fly round and round in a thick cloud just over the same 

 place, thus presenting an easy capture with the net. 



"Various writers have noted the common occurrence of this 

 species in the East, and certainly in Sarawak it is one of the 

 commonest butterflies. 



" Mr. Shelf ord mentions the resemblance of M. (P.) inclusus 

 to a Terias, as an instance of mimicry, in his table (I. c, 

 p. 257). 



II. Mimetic Coleoptera. 



"1. Between Clerids and Longicorns. 



"(a) The black-and-white-spotted pattern, which we notice 

 in the Longicorn (Fam. Lamiidae, Sub-fam. Phytoeciinae), 

 D aplasia pulchella, Pascoe, a beautiful mimic of the little Clerid 

 Callimerus bellus, Gorham. This resemblance is described and 

 figured in Mr. Shelford's memoir (I. c, p. 247, pi. xxiii, f. 53 and 



