292 Records of the Indian Museum. [Vol. IV, 



few small tufts forming spots placed 



at the tips of the veins, on the 



margin of the wing or at the forking 



of the veins : never covering any 



appreciable extent of the wing-sur- 

 face.' Sometimes a few, irregular- 

 ly placed^ at the base of the wings. 

 B Wings with the hairs on the veins only ^ 



arranged in two divaricate depress- 

 ed rows, one on each side, and 



generally overlapping those of the 



contiguous veins, presenting a 



"criss-cross" appearance to the 



whole wing. No hairs whatever on 



the surface of the wing. No obvious 



scales, except as forming the small 



spots. 

 C Wing with distinct black hair-spots at 



the tips of many or all of the veins. 

 D The 2nd longitudinal vein forks very 



closely proximad or distad of the 



base of the 3rd vein. 

 B Fore metatarsi wholly white scaled . . geniculata, sp. nov. 

 EE Fore metatarsi never wholly white 



scaled (at the tip only in albonigra, 



and not at all in bengalcnsis). 

 F Wings with thick black bushy hair on 



costa, with small spots (each com- 

 posed of one or two white scales), 



placed along a considerable section 



of it, at apparently regular inter- 

 vals. (The 2nd longitudinal vein 



forks immediately proximad of the 



base of the 3rd vein ; the fork of 



the anterior branch of the 2nd vein 



opposite that of the 4th vein.) . . albonigra, Brun. 

 FF Wings with only normally blackish 



grey hair ; scale-spots ivholly absent. 



The 2nd longitudinal vein forks 



barely distad of the base of the 3rd 



vein, practically simultaneously. 



The fork of the anterior branch of 



the 2nd vein a Httle distad of that 



of the 4th vein . . . . . . bengalensis , Brun. 



DD The 2nd longitudinal vein forks con- 

 siderably distad of the base of the 



3rd vein. 



i An api:»areut exception is P. orbicularis, in which scales are present on the 

 ba3al portion of the veins only, but never on the surface of the wing, that is to 

 say, emanating from the surface. 



