a2 Mr. R. M‘Lachlan on some 
Orolestes Selyst, sp. n. 
Wings hyaline only at the base and apex, the rest of the 
wing occupied by a very broad brownish-black band, with 
steel-blue reflexions, commencing in an oblique manner (and 
extended along the costal margin) before the nodus, and 
ending in a straight manner (but the edge slightly irregular) 
about one cellule before the pterostigma (in this dark portion 
the centre of each of the cellules is occupied by a small 
rounded paler spot, and the margins of the nervules are seen 
to be also very narrowly paler, more conspicuous when viewed 
by transmitted light) ; in the pale apical portion of the wing 
the dark band is margined by lacteous in an irregular 
manner, the lacteous portion appearing as if forming a very 
pale brownish cloud in certain lights. Pterostigma 3} millim. 
long, dark brown, enclosed in very strong black nervures. 
21-24 postnodal nervules in the anterior wings. Neuration 
black. 
Head black above, the ocelli testaceous; labrum and a 
large spot on either side of it olivaceous green; labium and 
back of head yellowish white. Prothorax olivaceous green, 
darker in the centre, its hind margin raised and regularly 
curved. Thorax above bronzy green, not metallic, somewhat 
paler (yellowish ?) on either side of the dorsal crest ; sides of 
thorax pale olivaceous green (probably yellowish in immature 
examples), the darker green of the upper surface continued in 
an irregular manner below the humeral suture, and above the 
median suture are traces of the same colour. ‘The olivaceous 
colour of the sides of the thorax is continued broadly on the 
sides of the first and second abdominal segments, and narrowly 
along the sides of the third to fifth and part of sixth segments ; 
abdomen above with a large spot occupying most of the first 
segment bronzy green, and the second segment wholly of this 
colour ; from the third to tenth bronzy black, but there is a 
long bluish space on the third and fourth, which are black 
only at base and apex. Legs black ; the femora brownish or 
yellowish beneath. 
3. Posterior margin of the seventh to ninth segments 
above with fine denticulations; posterior margin of tenth 
slightly notched in the middle. Superior appendages black, 
quite one half longer than the tenth segment, slender, forci- 
pate, the tips regularly incurved, finely denticulate externally 
in the apical half; internally there is a basal tooth, but near 
the base the usual dilatation (which is very slight) com- 
mences in an obtuse manner and ends below the apex in a 
large triangular, broad, acute tooth; the extreme apices con- 
