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WARNING COLORATION AND MIMICRY 
241 
cases as to be mistaken when on the wing, and the difference 
only to be detected by close examination. As an example of 
tne resemblance, woodcuts are given of one pair in which the 
colours are simple, being olive, yellow, and black, while the 
Fig. 23.—Methona psidii (Heliconidae). Leptalis orise (Pieridae). 
very distinct neuration of the wings and form of the head and 
body can be easily seen. 
Besides these Pieridse, Mr. Bates found four true Papilios, 
seven Erycinidse, three Castnias (a genus of day-flying moths), 
and fourteen species of diurnal Bombycidse, all imitating some 
species of Heliconidge which inhabited the same district; and 
it is to be especially noted that none of these insects were so 
abundant as the Heliconidse they resembled, generally they 
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