NEERESSA; PSEUDOCERYX; HYALAETHEA. By Dr. A. Seitz. 
81 
P. aroa Beth.-Bak. (9h) has head, forehead and thorax black, shoulders orange, abdomen blackish aroa. 
steel-blue; legs blackish. Forewings steel-blue. The arrangement of the spots is as follows: A wedge-shaped 
spot in the cell; a large spot widening out below it; those below ribs 4 and 5 egg-shaped, one above 6 
quite long, and a very small one above 7. The species is easily recognized by the hindwings being steel- 
blue throughout without any hyaline spots. The lobe at the inner margin with ivory-yellow fringe. ? like cf, 
but the dark colouring is brown, cf 30, ? 34 mm. From the upper Aroa River. Our figures represent the 
types in the Tring-Museum. 
9. Genus: jVeeressa limps. 
The two known species resemble somewhat the species of Heterogynnis, but are easily distinguished 
by the neuration. They also remind one superficially of certain Philippine Zygaenidae with which they are 
found together in the same localities. Antennae uncommonly long, hindwings likewise greatly lengthened, the 
inner margin passing imperceptibly into the termen. Their colouring is monotonous, the wings without any 
hyaline spots, but so thinly scaled that with the exception of the margins and a streak on the median vein 
of the forewings they are semi-transparent. The only two known species are found in the Philippines, where 
they appear to be rather scarce. 
N. whiteheadi Rothsch. (12a) is much larger than N. sagada Semp. Forehead white, antennae black, whiteheadi. 
abdomen whitish with 6 dark fine rings. Wings monotonously dirty earthy-brown, somewhat translucent, a 
dark, indistinct streak traversing the length of the cell. Hindwing faintly yellowish at costa. Northern Luzon. 
N. sagada Semp. greatly resembles the preceding species, but is only half its size. The grey shading sagada. 
is more distinct and darker, the white hyaline patches clearer. From Mindoro. 
10. Genus: Pseudoceryx Rothsch. 
Differs from Hyalaethea in shape and neuration. On the forewing vein 2 arises at the end of the 
cell, 3, 4 and 5 are long stalked; 6 arises at the apex of the cell, 7 and 8 long stalked, 9 is absent. So 
far only one minute species is known from New-Guinea, especially remarkable by the shape of its wings. 
P. dohertyi Rothsch. (P2c) has the forewing most curiously projected at the anal angle, in consequence dohertgi. 
of which the outer margin appears excavated in the middle. Body black-blue, thorax spotted with yellow. 
Forewing with an hyaline wedge-shaped spot in the cell, below which a slightly bent hyaline streak from 
base to near inner angle. In the outer half 3 very long, fine longitudinal spots. Hindwing with an hyaline 
spot near base. From Biak Island in Geelvink-Bay (Dutch New-Guinea). 
11. Gattung: Hyalaethea Btlr. 
This genus of which hitherto only one coloured illustration existed, is represented by figures of all 
the known species. It is intermediate between Sgntomis and Eressa, connecting them at the same time with 
Euchromia. All the hitherto described Indo-Australian genera have, like the following Eressa , one feature of 
the neuration of the hindwing in common, viz that ribs 5 and 6 are united; or to use another expression 
that only one vein goes from the upper angle of the cell towards the outer margin, whereas in Euchromia 
there are two. Between these two extremes Hyalaethea is intermediate. Although the hindwing itself often 
forms only a very insignificant appendage to the unproportionately large forewing, it proffers some secondary 
changes, in as much as the inner margin is projected to a little lobe which is folded when at rest, and 
frequently brillantly coloured. In all other respects the group is very near the Sgntomis. 6 out of 8 known 
species have the forewings hyaline with black border, from which black streaks extend toward the apex and 
middle of the cell, a pattern most frequently seen in Sgntomis and particularly in the species occurring in 
the same localities as Hyalaethea. Their geographical distribution is very limited, for all the known species 
come from the Papuan Archipelago. 
H. metaphaea Druce (Ilk) from the Solomon Islands, particularly Guadalcanar, is one of the largest metaphaea. 
species, resembling somewhat Ceryx keiensis (10b) or Sgntomis adjuncta (lli), but has the abdomen brown- 
black, delicately banded with yellow, without the yellow lateral spots of the latter. — georgiensis Rothsch. georgiensis. 
(Ilk) from New-Georgia has the wings rather deeper black than normal methaphaea, and may be easily 
distinguished by having the abdomen broadly ringed with brillant orange at the base, but for the rest 
unspotted jet-black. 
H. alberti Rothsch. (Ilk) is deeper black, the borders of the wings are broader and more sharply alberti. 
defined, the hindwings orange at the base, the abdominal rings fine, distinct, golden-yellow. Solomon Islands 
(Vella-Lavella), discovered in February by Meek. 
