( 590 ) 



and often traces of one or two more. The bonier of the hindwiug is narrower 



than in the ? of D. i. hypomelas, measuriug in the centre 2 mm. or less, seldom 2-5. 

 A long series of both sexes from Mount Goliath. 



1'). Delias albertisi Oberth. (188(i). 



This species is known from the Arfak district, 8ekar and Kapanr in 

 western and the Snow Mountains in southern Dutch New Guinea, and from 

 the Owen Stanley Mountains in British New Guinea. No albertisi form has 

 as yet been found in the German territory. The races differ essentially in 

 the extent of white on the wings and the size of the black discal spot on the 

 underside of the hindwing. These characters are by no means constant, as our 

 series of specimens of two of the three races proves. Four names have been 

 given to the forms of this species, albertisi, discus, neyi, and africanus. Of these 

 discus has generally but erroneously been sunk as a synonym of albertisi, while 

 the newly-erected africanus does not ajipear to have any standing. 



a. D. albertisi albertisi Oberth. (1880). 



?. PierU albertint Oberthiir, Ann. Mus. Ch: Gen. xv. p. 480. no. 33 (1880) (Andai, Aug. 1872) 

 J'ieris d'albei-thi, id., I.e., tab. 4. eg. 4 (1880). 



(J. Z)«/(a.s- africanus Kenrick, Tran.t. Ent. Soc. Land. p. 18. tab. 3. fig. 2 (1911) (Arfak Mts , 

 Jan. 1909). 



Neither author states which se.x he figures. But judging from the forewing 

 albertisi is .based on a ? and africanus on a S. Andai being in the Arfak district, 

 we have no doubt that the two specimens belong together as sexes, and do not 

 represent different subspecies. 



b. D. albertisi discus Hour. 



? . Delias disrus Honrath, Bert. Ent. Zeitschr. xxxiii. p. 130. tab. 6. fig. 4 (1886) (Sekar). 



A. 8. Meek obtained a fine series of this form on the slopes of the Snow 

 Mountains at 30UU ft. approximately, in the neighbourhood of the Oetakwa River. 

 Our collection also contains a ¥ from Sekar (the type, from coll. Ribbe), and a J 

 from Kapaur collected by W. Doherty. 



While in the previous race the forewing is entirely black on the npperside 

 in both sexes (apart from a row of submarginal spots present in the ? ), one-lialf 

 to three-fifths of it are white in the cJ of discus and about one-third in the ?. 

 The upperside of the hindwing is white in both sexes, bearing a black border, 

 which in the cJ is 3 to 6 mm. wide and narrows to a mere line posteriorly, and 

 in the ? measures more than twice as mach. 



It is interesting to note that the preceding sulispecies with its entirely black 

 upper surface to the forewing has jireserved a remnant of the white colour on the 

 underside at the hindmargin, the patch being covered in life by the hindwing. 

 In discus this patch is larger, extending forward to M' and sometimes even beyond, 

 but never entering the cell, and is much suffused with black at the edges or 

 all over. It is on an average somewhat smaller in the ¥ than in the S. The 

 persistence of the white colour at the hindmargin (and in other species also 

 at the costal margin of the hindwing above) when the colour or pattern has 

 become modified, is a feature widely met with in Pierids. The subapical band 



