CRAMBin.-E—CALAMOTROPHA. 123 



Antennas of the male rather short, simple but very 

 minutely notched, pale brown in front, white at the back, 

 and downy with white scales at the base ; palpi long, 

 pointed, porrected or sometimes a little bent down, pale 

 brown above, white beneath, the maxillary pair showing as 

 loose tufts; head and thorax white faintly shaded with 

 brown ; abdomen silky white. Fore wings broad, squared 

 behind ; costa nearlj' straight ; apex squarely angulated, as 

 also is the anal angle in a less degree, the hind margin 

 being nearly straight ; colour whitish-drab or whitish- 

 brown, with the nervures faintly and narrowly streaked 

 with darker brown, a blackish dot marks the base of the 

 discal cell, and one, or perhaps two, more, the position of 

 the usual discal spot, but all these are uncertain and often 

 absent ; beyond the middle is an oblique series of brown or 

 black dots representing the ordinary '■ second line," often 

 faint or even obsolete; cilia glossy whitish-brown. Hind 

 wings very broad and ample, rounded behind ; shining 

 snowy white, with the margin and nervures toward the 

 apex faintly tinged with pale brown ; cilia shining white. 

 Female similar, or with the fore wings whiter, usually rather 

 larger and stouter. 



Underside of the fore wings whitish-brown, of the hind 

 wings white, without markings. Body and legs white. 



Rather variable in the colour of the fore wings, which 

 shade in gradual degrees towards white, often having the 

 faint lines and the dots more or less obliterated ; but occa- 

 sionally pure white specimens have these dots distinctly and 

 conspicuously black. Very fine examples of this form are 

 in the collection of Mr. Sydney Webb. They were obtained 

 in Wicken Fen by the late Mr. F. Bond. 



On the wing in July and the beginning of August. 



Lakva one inch long ; having a porcelain-like gloss ; the 

 dorsal line visible from beneath the skin, and similar dots 

 on the front and sides ; head small, brownish. 



