( Hii ) 



a paper contributed to the British Association at Bradford in 

 1900, says that many Longicorn species in the same way 

 mimic Braconidse : he describes the effect in one species of 

 Oberea as being as perfect as if an artist had deliberately 

 painted the profile of a Hymenopterous abdomen on that of a 

 beetle. 



Although the foregoing instances given under this heading 

 fall under what is understood as u Batesian Mimicry," the 

 term is by many applied more or less exclusively to the imita- 

 tion or mimicry of the distasteful butterflies belonging to the 

 family Heliconiidae by certain species of Pieridn?, Papilionidse, 

 and Castniadoe, as noted by Mr. Bates in the Amazon region 

 and described by him in the celebrated paper which he read 

 before the Linnean Society * ; it is in this sense essentially the 

 imitation of a distasteful species by a tasteful but otherwise 

 unprotected insect belonging to the same order : as we shall 

 see, however, a great deal of what is thus called " Batesian 

 Mimicry " falls under Miillerian Mimicry, and it is often hard 

 to find definite and well-distinguished examples of the former. 

 The curious case of the Nymphaline genus Protogonius, which 

 is cryptic or protectively coloured on its under side (resem- 

 bling a leaf), while on its upper side it agrees closely in 

 coloration with the well-known Miillerian group of the 

 Ithomiinae, Danainae, Acrseinae, etc., is an undoubted example : 

 in Coleoptera we find an instance probably in certain 

 Brenthidae which are mimicked by Longicorns : and the 

 mimicry of Lampyrids by certain Longicorns belonging to 

 the genera Dadoychus and Alampyris may also be quoted : 

 the latter imitate even the light coloration of the luminous 

 segments of the underside of their models : this raises a 

 question perhaps as to the protection of nocturnal insects : 

 we do not, however, know enough of the vision of insects, to 

 be able to say much on this point : as a rule the nocturnal 

 insects have the eyes coarsely facetted and are cryptic in 

 coloring, whereas the day-flyers, such as Clytus, Pachyta, 

 etc., have the eyes finely facetted and mimic other insects, 

 or are protected by falling into a Miillerian group ; in cases 

 where the mimicry appears to be plainly Batesian the mimics 

 * "Trans. Linn." Soc. Zool., vol. xxiii, p. 495-566. 



