ENTOMOLOGY. 



of no small importance in an enquiry of this nature. In the present 

 instance it may be also added that this identity is essentially material 

 to be considered, because there is another insect of the same tribe, 

 the Papilio Laodocus of the same author, which assim ilates so closely 

 with it, that without due attention, the one might readily be con- 

 founded with the other. These two butterflies, however, although 

 they appear so nearly allied, present characters which considered 

 accurately, demonstrate very clearly that Fabricius was right in 

 separating them. Fabricius adverting to this close affinity, observes, 

 that in size and appearance Papilio Acamas agrees with Papilio 

 Laodocus. The predominant colour of P. Acamas, he observes, is a 

 dark or fuscous brown, much less inclining to black than P. Laodocus. 

 The anterior wings in both species have a yellow transverse band : 

 this band in P. Acamas extends from the anterior margin almost 

 close to the posterior margin, and touches the posterior rib ; in P. 

 Laodocus this yellow band is abbreviated or shorter, of greater 

 breadth, and placed more immediately towards the middle of the 

 wing, the band in P. Acamas being situated rather nearer towards 

 the exterior end of the wing. There is also a marginal series of 

 yellow spots at the extremity of the anterior wings, the form of 

 which is very singular, and affords a striking distinctive character 

 of P. Acamas. There is also a characteristic difference observable in 

 the markings of the posterior wings : in both species, on the upper as 

 well as lower surface, those wings are elegantly marked with a distinct 

 arch of red lunules, posterior to which is another of blue ; beyond 

 these in P. Acamas is a third series of lunules, rather larger than 

 either of the former, the colour of wliich is bright yellow. There is 

 a final or posterior arch of lunules in P. Laodocus, behind the two 

 series of red and blue lunules, similar to those of P. Acamas, but 

 they are smaller, and instead of yellow are white. And lastly, the 



