4 
SPOLIA ZEYLANICA. 
position on the slide, lightly smearing them over with clove oil, 
carefully cover them with a drop or two of Canada balsam, and 
apply over them a cover-glass, which maybe held down by a clip or 
small weight for a few days until the balsam is hard. By adjusting 
the mirror of the microscope, so that the rays fall a little obliquely, 
the nervures show up fairly well. Descaling by means of a very 
fine brush or by immersion in “ Eau de Javelle ” is not, as a rule, 
satisfactory, except in the case of large specimens. 
Structure. 
For the convenience of local collectors I give a diagram showing 
the terms used in descriptions of the parts of a wing :— 
AJ 
Base. 
ABC 
Costa. 
C 
Apex. 
BCDE 
First segment or lobe. 
CD 
Termen or outer margin. 
D 
Posterior or anal angle. 
DE 
Posterior margin of first segment. 
DEF 
Cleft or fissure. 
E 
Base of cleft. 
EF 
Anterior margin of second segment. 
F 
Anterior angle of second segment. 
EFGH 
Second segment or lobe. 
FG 
Termen or outer margin. 
G 
Tornus, tornal or anal angle. 
JHG 
.. Dorsum, dorsal or inner margin. 
Positions in the wing are reckoned from the base outwards ; for example, 
a marking at position B in the figure would be described as a marking on costa 
at f ; one at position K would be in disc at |; one at M would be a subcostal 
marking at §. 
Apical 
. , Touching the apex. 
Anterior 
Nearer to the head. 
Posterior 
.. Further from the head. 
Cilia 
The fine hairs composing the fringes of the wings. 
Falcate 
Hooked or ben^t like a sickle. 
Ferruginous 
Rust-coloured. 
Fissured 
Cleft, divided into lobes. 
Fuscous 
Grey-brown. 
Linear 
Having no apparent breadth nor any outer angles. 
Sub- 
.. Nearly or rather. 
Pectus 
The lower surface of the thorax. 
