THOAS Lysithous, 

 Lysithous Butterfly. 



Sub-fam. Papilionse. Genus, Papilio. Sw. Sub-genus Thoas. Nob. 



Sub-Generic Character. 



Posterior wings terminating in spatulate or obtuse tails ; the margins 

 deeply scoloped ; Larva smooth ; Pupa braced, with the head 

 directed upwards. 



Typical Sections. 



1. Wings with macular yellow bands. Pap. Thoas. Auct. 



2. Wings with entire white bands, the posterior 



spotted with crimson. Agavius. 



3. Wings black, varied with emerald green 



bands or dots; tails short, obtuse. Paris. 



4. Tails obsolete. Evander. 



5. Tails short, acute. Androgeus. 



Specific Character. 



Wings uniform black ; anterior with a white band ; posterior 

 dentated and tailed, margined by red lunules ; the disk white, 

 bordered behind by 4 — 5 red spots. 



Papilio Lisithous. Ency. Meth. 1. p. 73, no. 136. 



We discovered this imposing species in the interior of 

 Brazil, in 1814, long before it was made known in France 

 by the specific name we have adopted. It is confined 

 to the southern provinces ; for we never rcet with it north 

 of the 11 io St. Francesco. Although greatly resembling 

 Thoas Agavus and Harrisianus, (Z. 111. 1 Series, pi. 109) 

 it is at once distinguished by the longer and more acute 

 dentations of the inferior wings. The under side shews 

 no material difference from the upper. To the second 

 type of this subgenus belongs ahoAscarius L. Polybius Sw. 

 (Z. I. I Series, pi. 137), and Tros. Fab. while Dardanus 

 F. probably connects this American group with the third 

 or Paiis type, whose geographic range is confined to Asia. 

 In the fourth form (Evander), representing the Heli- 

 conian type, the tails are obsolete, hut they begin to appear 

 again in the fifth, and thus complete the circle of the 

 sub-genus Thoas. By studying this natural scries, the 

 Entomologist will discover a most beautiful set of analogies 

 between the genera Papilio and Ampltrisius, 



121. 



