PLATE I. 



NAT. SIZE.) 



Fig. i. Italian Salmon race, white type, in last instar. 



Fig. 2. Italian Salmon race, tiger-banded or zebra type, in last 

 instar. 



Fig. 3. Galbin Italiano race, in 4th instar. 



Fig. 4. Japanese White race, in 4th instar. 



Fig. 5. Mosaic of tiger-banded and pattern types, last instar. 



Fig. 6. Clayey-yellow or "muddy" type, last instar. 



Fig. 7. Chinese White race, in 4th instar. 



Fig. 8. Sport or abnormality, in 4th instar. 



Fig. 9. Sport pattern, spot marking on segments, in 4th instar. 



Fig. 10. Japanese White race, in 3rd instar. 



Fig. II. Front view of head and thoracic segments, showing varia- 

 tions in thoracic markings ("eyebrows"). 



Fig. 12. Posterior segments of three specimens, showing "hornless," 

 "tubercled" and "fully horned" conditions. 



