726 
ERIBOEA. By H. Frtjhstorfek. 
a submarginal series of small white streaks being absent in the schreiber- forms. Median area of the hindwings 
shorter but more extensively encircled by a blue tinge than in the Javanese race of E. schreiber. Tails with 
their points nearer to each other. Under surface characterized by a pronounced net of black stripes surround¬ 
ing and defining two silvery white spots of the cell of the forewing and the median band of the hindwing. 
cognatus is rare in all the parts of the island, but seems to occur the most numerously in August in the north, 
as for instance near Palu, as well as in the south of Celebes. The $ not yet discovered. 
E. dehaani, more popular by the name of ,,Jcadeni“ and as ,,circular butterfly” (,.Zirkelsehmetterling‘‘), 
numbers among the oriental butterflies most in demand since Wallaces report in his ,,Malayan Archipelago”. 
But since 1861 till my expedition to Java in 1891/94, only one or two good specimens have come to Europe. 
Only during my stay at Sukabumi, in 1892, Javanese hunters succeeded in capturing a number of AA- I 11 
1896, the collector Pkillwitz succeeded in taking also the $. dehaani is beneath remarkable for a silvery white 
basal area exhibiting on the forewings a series of black streaks and on the hindwings a peculiar triangular area 
densely dotted with black, traces of which are also noticed in E. cognatus. Hindwings furthermore distinguished 
by a black, Y-shaped band and three reddish-brown crescents being proximally dusted with violet and exten- 
dehaani. ding within the tails, between the anterior median and the anal angle, in the shape of a demi-bow. — dehaani 
Dbl. (= kadeni Fldr.) (137 a) with a blackened cell of the forewing, a broad black distal margin of the hind¬ 
wings and a relatively narrow and dark blue crescentiform hue at the base of the tails likewise dusted with 
blue. $ considerably larger than the A with a double yellow transcellular spot and a narrower black bordering 
round the forewings. Hindwings likewise more extensively scaled in yellowish, the predominant yellow part 
sends forth a long tooth, between the anterior and middle median, towards the origin of the anterior tail. The 
tails are broader and therefore also more extensively covered with blue. Beneath like the Ad\ but the three 
crescents dusted harmoniously with purple and whitish violet and embedded in the submarginal zone in a 
fine curve, are much narrower. Habitat exclusively the Megamendong, the northern ridge of the Gede Volcano, 
1480 m, being easily reached from Buitenzorg. Wallace got there his specimen which a Javanese boy had 
surprised and captured in an undamaged condition on its feeding on the moisture from a pool near the road. 
The occurrence of the butterfly is*rather limited there, and if one day larger tea or coffee plantations or other 
cultivations should expand there, the noble butterfly will be destined to die out. dehaani is extremely constant, 
and judging from the 15 Ac? of my collection, only the colour of the cell of the forewing varies, being quite 
black in the rarest cases, but oftener lightened in its apical part being strewn with bluish-green scales. Only 
sidthan. 2 $$ are known to me: the type in my collection and a specimen in the Tring Museum. -— sulthan Hag. of 
a smaller shape than kadeni, one of the few forms being exclusively common to Java and Sumatra, sulthan 
exhibits remarkably lighter colours than the Javanese ally, while otherwise the Sumatrans appear not only 
larger, but also darker than the Javanese vicarious types. Cell of the forewing nearly throughout light yel¬ 
lowish, quite thinly scaled in green. Preapical spot only punctiform. Black distal margin narrower, the blue 
of the hindwings much lighter, more extensive. The orange anal spot of the hindwings more distinct. Under 
surface with finer black stripes of the forewings. The magnificent tripartite submedian bow of the hindwings, 
the elegant appearance of which reminds us of the crescents of Papilio paris and arcturus group, is about one 
third narrower. Sumatra from the Gaju-Districts and the Battak-Plateau; I obtained it also from the Padang- 
Boven country (West Sumatra). A $ is in the collection of the British Museum, differing from the A by the 
considerably larger orange spot and a somewhat lighter blue of the upper surface of the hindwings. 
E. pyrrhus, the most multiform species of the genus, being the most widely distributed in the Malayan 
Archipelago and forming the most characteristic example of insular differentiability. The two extremes of 
the colouring on the upper surface are exhibited by our figures 134 d ( sempronius) with preponderantly yello¬ 
wish green colours and uncovered basal region of the upjter surface, and ( jupiter) (135 a) with predominantly 
black bordering and the basal zone covered with black. The former group of forms is confined to Australia 
and Micromalayana, the latter group to the subregion of the Moluccas and Papuans. Both are united by transi¬ 
tions as for instance the proper pyrrhus from Amboina. The under surface also shades off from one island to 
another by the increase or reduction of the black and reddish-brown spots as well as of the white median areas 
of which especially that of the hindwings may increase or decrease in extent and also in length. $ always larger 
than the A> of a most variable development of the orange terminal margin of the under surface of the hind¬ 
wings. Larva only known of one race, on Albizzia and Meclua ferrea, the iron-wood tree. Pupa of the 
usual sacciform shape of the pupae of the Charaxides, broad, rounded off with some tubercles on the crema¬ 
ster, pale-green with snow-white stripes and spots. The flight of the butterflies is rapid, what we may guess 
already from the appearance of the imago being frequently known only in the $ form. A sometimes on blosso¬ 
ming trees where they rest for some moments opening and closing their wings with a scratching sound 
jovis. similar to that of Prepona. ■ — With jovis Stgr. the series of insular races approximating sempronius 
(134 d) begins. A with a black apical covering of the forewings extended somewhat further towards the 
wall of the cell, enclosing on the whole four preapical spots instead of two as in sempronius. Under surface 
