PREPONA. By H. FRUHSTOREFER. 563 
derably reduced. All the black dots and comma-like streaks in the white basal area of all the wings more preg- 
nant. Ecuador, from 1000 m. 
P. dexamenus was formerly known only from Peru and the Upper Amazon, but was discovered by 
my collector Jutrus Mrcwaetts also near Obidos, in Surinam, as well as in Espiritu Santo and lately also in 
Mato Grosso. Marking of the upper surface plain. 33 without preapical spots, 2 always with a moderately 
large transcellular spot and one or two indistinct blots. Hindwing with an anal eye-spot showing through 
from beneath, being in the 2 sometimes surrounded by an ochreous periphery. The under surface resembles 
that of P. amphimachus (112 ¢) from which it differs by the presence of 2 blue-pupilled ocelli, being characteristic 
of the P. laértes-group. Four local forms are to be registered: krates Fruhst. (112 b) a geographical form of 
small habitus; the gorgeous area of the upper surface somewhat darker and narrower than in specimens of the 
Andine region. Under surface rather uniform, the distal half loam-yellow. Surinam, Lower Amazon. — leuctra 
Fruhst., an eminently differentiated race with still more advanced darkening and narrowing of the blue bands. 
Under surface in 5 specimens of my collection uniformly dark grey, something like in P. gnorima (112b). All 
the black markings of the under surface besides more strongly arranged and the black areas in the submedian 
zone of the forewings nearly again as broad as in leuctra. So far only known from Espiritu Santo, leuctra is 
presumably found yet in Minas Geraes and perhaps in the state of Rio de Janeiro. — psacon subsp. nov. forms 
the transition from leuctra to dexamenus. The gorgeous area of the upper surface more extensive than in the 
other individuals lying before me, the shape considerably larger. Distal colour peculiarly greyish-brown and 
especially strongly contrasting with the basal zone, being conspicuously decorated in a wonderful silvery white. 
Mato Grosso. — dexamenus Hp/f. (112 a, 2 instead of 3), originally dewamenus described from the Chancha- 
mayo in Peru, lies before me from Bolivia from whence also our figured 9 originates, which Mr. Fasst has disco- 
vered there. The 33 are surpassed in size by those from Mato Grosso; the magnificent area is lighter, of a 
brighter lustre than in the races of the Atlantic region of the continent. The distal half of the under surface 
of both the wings either darker loam-yellow than in krates, or light coffee-brown as in the 34 of psacon 
from Mato Grosso. The 2 from Bolivia has, contrary to the black eyespotted 2° of krates and leuctra, an ochre- 
yellowish defined ocellus on the upper surface of the hindwings. In the Coll. SraupINGER there are specimens 
from Colombia. 
P. neoterpe. An imposing species of the Andine region, approximating above P. dexamenus, beneath 
more P. gnorima, eugenes and pylene by an especially luxurious median silvery band of the forewings. The 
alliance with P. omphale and P. gnorima is, furthermore, indicated by a magnificent violet hue in the basal 
zone of the forewings. Clasping-organs with very long uncus. Valve somewhat like in Jaértes, but still a little 
more slender; the club at the uncus considerably longer and more robust; oedeagus broader. Two areal forms: 
neoterpe Honr. (112d). Beneath sometimes reddish ochre-yellow, occasionally also more fallow, more loam- 
coloured, as in our figure having been depicted according to a § from Pozzuzo. The 2 which we represent by 
a figure, is in the collection of Mr. Ropprt BreDERMANN. The type originates from the Chanchamayo. — pho- 
tidia Fruhst. A northern areal race, considerably differing from the Peruvian name-type by the conspicuously 
stunted, scarcely half as broad and besides much darker blue median bands of all the wings. On the under 
surface, however, there are no differences noticeable. photidia, by the colouring of the upper surface, forms 
a transition to P. lygia Fruhst. from Chiriqui (Iris XVII, Table 6, fig. 2), which seems to replace neoterpe in 
Central America. From the Upper Rio Negro, from an altitude of about 800 m, discovered by A. H. Fasst. 
P. lygia Fruhst. In lygia the melanotic reduction of the blue magnificent band of the upper sur- 
face is still further advanced than in photidia, and in it the otherwise resistent under surface takes also part 
in the sombre discoloration, the ochre-yellow of neoterpe turning into a greyish-black and the transcellular 
silvery spots on the forewings disappearing, too. It is now most likely that another Prepona will be discovered 
also in the Western Cordilleras of Colombia, losing the character of neoterpe still more than photidia and esta- 
blishing a more complete transition to P. lygia. In case this should come true, P. lygia would no more be rightly 
called a species, but degraded to the northernmost branch of neoterpe. Lygia has above little likeness with 
omphale and gnorima Bates and reminds us beneath somewhat of P. gnorima but without being in any way 
allied toit. The forewings bear a long-stretched and pointed apex, but the hindwings are narrow oval and very 
little undulated. On the forewings there is a very narrow dark-blue, glossy discal band running from the anal 
margin anteriorly, growing narrower in order to dissolve into minute blue grains of dust between the anterior 
medians. On the hindwings the band is somewhat broader and is reduced in width towards the anal argle. 
The blue discal band on the forewings is proximally surrounded by a magnificent, extensive, dark violet reflec- 
tion being continued on the hindwings towards the base, as a narrow zone. The ocelli of the under surface 
show through above, otherwise the wings are without any markings. On the under surface, the basal third 
of the forewings is of a silvery white, with a slight grey tinge in the basal part of the cellule of both the wings. 
Beyond the cellule we notice a large, dark brown spot being encircled by black. Above this there is a silvery 
white macula at the costal margin like in gnorima, and 3 white spots are beyond the cell as a distal bordering 
of the black discal band. The submarginal band of the forewings is strongly curved, though not so serrated 
krates. 
leuctra. 
psacon. 
dexamenus. 
neolerpe. 
photidia. 
lygia. 
