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species both sexes were apterous (Cremnodes). What the 

 normal condition is in reallity, and what is the cause of 

 these deviations (too little or too much food for example) 

 1 dare not say. Future researches alone can clear this 

 point, Avhen sufficient bred material is obtainable — also 

 from other hosts than spiders' eggs as for example Dipterous 

 pupæ. At the same time opportunity will be given to ex- 

 plain the colour variations of individual species. I am of 

 the opinion that Pez. cursitans and Fez. faciatus amongst 

 others, are not always easily separated from each other by 

 the colour, and also that Pez. zon. has not always the same 

 number of black bands on the abdomen. 



