168 MESSRS. RILEY AND GODFREY ON 



All the figures have been drawn from the actual Type speci- 

 mens by Miss O. F. Tassart. By an unfortunate error of the 

 printers, these have, in the pr-ocess of reproduction, been reduced in 

 size, those in Plates IV, V and VII, to approximately 4, 5ths., and those 

 in Plate VI to approximately 9/10ths. the natural size. 



PAPILIONIDiE 



1 Papilio laos, sp nov. 



(Plate IV, fig. 1.) 



d\ Upperside, foreiving. — Dark shiny blue-black, immaculate, 

 the distal half of costal area lighter, slightly greenish, the interner- 

 vular and cellular rays darker, not very conspicuous. Hindwing. — 

 Not so dark (except the cell and towards the base of the wing) ; 

 tinged with greenish. There are pink bilunulate submarginal spots 

 present in areas 2 and 3, extending right across these areas, in area 

 4, incomplete, and in area 5, almost obsolete, each densely irrorated 

 with black scales and bordered outwardly by an indistinct quadrate 

 dark blue-black spot reaching the margin, and inwardly surmounted 

 by conical spots of the same colour. The cottony lining of the 

 abdominal pocket is very pale ochreous, almost white. There are 

 traces of pink scaling inwardly at the tips of the conical dark spots 

 referred to, in areas 2 and 3, and at the distal end of the abdominal 

 fold. 



Underside, both wings. — As above, except that the foreiving 

 is dull blue-black not shiny, and paler than the hindwing, so that 

 the internervular and cellular rays are more conspicuous ; and that 

 in the hindwing the pink spots are more fully developed and free of 

 dark scaling , and consist of a submarginal series of 5 spots, i. e., in 

 areas 2 to 6, and a discal series of four cresceotic spots in areas 2 to 5, 

 that in area 5 being minute, the others increasing in size progressiv- 

 ely. In each series the spot in area 2 overflows into area lc, the 

 submarginal one only slightly, the discal one very considerably. The 

 ground-colour of the hindwing is nearly uniform on the underside, the 

 Greenish tin^e beingr confined to costa and hind-margin and the 

 extremities of the veins. 



Head clothed with red hairs tipped, except above, with black. 



JOURX. NAT. HIST. SOC. SIAM, 



