80 THESTIAS WEELEI, 
NOTE XVIII. 
DESCRIPTION OF A NEW SPECIES OF THE 
LEPIDOPTEROUS GENUS THESTIAS 
BY 
R. VAN EECKE. 
Thestias Weelei, nov. spec. Q. 
Uppersurface of body black-gray; undersurface of head 
with palpi and of thorax pale yellow, that of abdomen 
white; legs yellow, tarsi brownish; antennae black above, 
white beneath, the tip pale brown; eyes brown. 
The base of the forewing is covered with a grayish 
brown dust; the top is equally black-brown with a narrow 
short orange-yellow slightly curved band, beginning at 
the centre of the costa (where the colour is more pure 
yellow) and followed by two transverse larger orange- 
yellow spots, of which the first is provided near the outer 
margin with a black-brown spot; the second is dissolved 
into two small orange-yellow spots. The colour of the unde- 
scribed triangular part of the forewing is yellowish white. 
The hindwings are yellowish white, with a broad fallow 
black-brown margin; the line of demarkation between the 
two colours is crenulated; the extreme base is diffusely 
covered with a grayish brown dust. 
The undersurface of the wings is light yellow, marbled 
with brown exactly like in the © of Zh. Pieperstt Snell. 
Th. Weelei however has in the brown spots a small 
whitish centre, situated upon the nervures. Moreover the 
new species is allied to Th. malum sinicum Thieme, from 
the island of Nias. 
Wing-expansion 50 mm. 
The Leyden Museum possesses one female specimen, 
found in the collection brought together in the Dutch 
East-Indies by the late Dr. H. W. van der Weele. It has been 
captured by him in the island of Sabang, north of Sumatra, 
on 2] April 1909. 
Leyden Museum, February 1912. 
Notes from the Leyden Museum, Vol. XXXIV. 
