EXPLANATION TO PLATES, 



PLATE I. 



COSSUS CEXTERENSIS. 



Is Group of eggs as deposited, natural size. 



2. Egg magnified 9 diameters. 



3. Caterpillar from time of emerging to October 14— four months' growth 



4. Caterpillar of one year and four months' growth. 



5. Caterpillar of two years and four months' growth. 



6. Mature caterpillar, three years old; ready to pupate. 



7. Pupal cell. 



8. Male pupa. 



9. Female pupa. 



10. Male Cossus, unspread. 



11. Female Cossus. 



12. Female Cossus, showing ovipositor. 



PLATE II. 



COSSULA MAGNIFICA. 



1. Pupa case of Cossula magnifica. 



2. Cossula maguifica. Male. 



3. Cossula magnifica. Female. 



4. Cossus querciperda. Male. 



5. Cossus querciperda. Female. 



6. Cossus angrezi. Female. 



PLATE III. 

 Silk fibres. 



1. Fibre of white Cevennes race. 



2. Fibre of Crozier's black race. 



(Both figures magnified 240 diameters. ) 

 (72) 



