ILL USTEA TIVE OF NA T UEAL SELECTION. 187 



colouration. Using these characters, I divide the 

 Malayan Papilios into four sections, and seventeen 

 groups, as follows : 



Genus OENITHOPTEEA. 



a. Priamus-group. 1 , 



c. Brookeanus-group. j Black and ^ een ' 



b. Pompeus-group. Black and yellow. 



Genus PAPILIO. 



A. Larvae short, thick, with numerous fleshy tubercJes ; 



of a purplish colour. 



a. Nox-group. Abdominal fold in male very large ; 



anal valves small, but swollen ; antennae mode- 

 rate ; wings entire, or tailed ; includes the Indian 

 Philoxenus - group . 



b. Coon-group. Abdominal fold in male small ; anal 



valves small, but swollen; antennas moderate; 

 wings tailed. 



c. Polydorus-group. Abdominal fold in male small, 



or none; anal valves small or obsolete, hairy; 

 wings tailed or entire. 



B. Larvae with third segment swollen, transversely or 



obliquely banded ; pupa much bent. Imago with 

 abdominal margin in male plaited, but not re- 

 flexed ; body weak ; antennae long ; wings much 

 dilated, often tailed. 



d. Ulysses-group. 



Protenor - group (Indian) is 



e. Peranthus-group. 



f. Memnon-group. 



somewhat intermediate be- 

 tween these, and is nearest 



to the Nox-group. 

 g. Helenus-group. 

 h. Erectheus-group. 

 i. Pammon-group. 

 k. Demolion-group. 



C. Larvae subcylindrical, variously coloured. Imago with 

 abdominal margin in male plaited, but not re- 

 flexed ; body weak ; antennas short, with a thick 

 curved club; wings entire. 



