4 SPOLIA ZBYLANICA. 



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 



ABC 



C 



BCDE 



CD 



D 



DE 



DEF 



E 



EF 



F 



EFGH 



FG 



G 



JHG 



Base. 



Costa. 



Apex. 



First segment or lobe. 



Termen or outer margin. 



Posterior or anal angle. 



Posterior margin of first segment. 



Cleft or fissure. 



Base of cleft. 



Anterior margin of second segment. 



Anterior angle of second segment. 



Second segment or lobe. 



Termen or outer margin. 



Tornus, tornal or anal angle. 



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 oncosta 

 at | ; one at position K would be in disc at J ; one at M would be a subcostal 

 marking at J. 



Apical .. Touching the apex. 



Anterior . . Nearer to the head. 



Posterior . . Further from the head. 



Cilia . . The line hairs composing the fringes of the wings. 



Falcate . . Hooked or bent 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 rati ler. 



Pectus . . The lower surface of the thorax. 



