238 A NATURALIST IN BORNEO 



and I feel almost convinced that they belong to that 

 great congeries of heterogeneous species which have 

 nothing in common save their unpalatability and their 

 Lycoid colouring. I will return to this later. Colly- 

 rodes lacordairei and Sclethrus amcenus of the sub- 

 families Sestyrince and Clytince respectively mimic Tiger- 

 Beetles. 



We now come to our last section, the Longicorns 

 mimicking other Longicorns. Just as amongst butter- 

 flies so amongst this group of beetles do we find 

 that certain genera are protected and serve as models 

 to many other genera. Amongst Longicorns the pro- 

 tected families are two only, both of the Cerambycidce, 

 viz. the Callichromince and the Clytince. The species 

 of the former which serve as models all belong to 

 one genus, Chloridolum ; they are all bright metallic 

 green beetles, occurring in great abundance on felled 

 timber ; they emit a strong, but to human nostrils by 

 no means an unpleasant, odour proceeding from glands 

 in the thorax, which open to the exterior by two 

 pores. As the table on page 246 shows, they are 

 mimicked by members of two Lamiid sub-families, the 

 Saperdince and Phytceciince, and of three Cerambycid 

 sub-families, the (Emiince, Disteniince, and Lepturince. 

 The Clytince include the British Clytus arietis, a species 

 which, as is well known, is marked like a wasp and 

 when seized behaves as if it were about to sting. We 

 cannot say for certain if this is a case of Miillerian 

 or Batesian mimicry, but I am almost certain that the 

 Oriental Clytince are for the most part protected. 

 Chlorophorus (Clytanthus) annularis, a yellow beetle 

 banded with black, swarmed in countless numbers on 

 Mt. Penrisen, while round Kuching some species of 



