16 



BULLETIN 539, U. S. DEPARTMENT OF AGRICULTURE. 



Table IV. — Number of instars, their length, and length of larval life of Elasmopalpus 

 lignosellus during the months of June and July, 1914, at Columbia, S. C. 



Number of tube. 



First 

 instar. 



Second 

 instar. 



Third 

 instar. 



Fourth 

 instar. 



Fifth 

 instar. 



Sixth 

 instar. 



Length 



of larval 



life. 



1 



Hours. 

 56 

 44 

 44 



44 

 44 

 56 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 44 

 56 

 44 



Hours. 

 60 

 36 

 36 

 36 

 36 

 60 

 36 

 36 

 36 

 36 

 48 

 48 

 48 

 36 

 36 

 36 

 36 

 36 

 48 

 36 



Hours. 

 48 

 48 

 60 

 48 

 48 

 48 

 48 

 60 

 48 

 48 

 36 

 36 

 36 

 48 

 60 

 60 

 48 

 60 

 84 

 48 



Hours. 

 96 

 60 

 48 

 60 

 60 

 72 

 84 

 72 

 84 

 60 

 60 

 60 

 60 

 60 

 72 

 72 

 60 

 72 

 84 

 84 



Hours. 

 144 



144 

 72 

 84 

 48 

 172 

 144 

 84 

 72 

 84 

 72 

 84 

 84 

 48 

 144 

 120 

 84 

 72 

 180 

 144 



Hours. 



Hours. 

 404 

 332 

 404 

 416 

 408 

 408 

 356 

 404 

 4C4 

 404 

 404 

 428 

 428 

 356 

 356 

 332 

 416 

 404 

 452 

 356 



2 





3 



144 



144 

 172 



4 





6 







8 



108 

 120 

 132 

 144 

 156 

 156 

 120 



g 



10 



11 



12 



13 



14 



15 



16 





17 



144 

 120 



18 



19 



20 





Average 





45. S 



40.8 



50.5 



69 



104 



138.3 



393.6 



TA3LE V. — Number of instars, their length, and length of larval life of Elasmopalpus 

 lignosellus, during the month of August, 1915, at Columbia, S. C. 



Number of tube. 



First 

 instar. 



Second 

 instar. 



Third 

 instar. 



Fourth 



instar . 



Fifth 

 instar. 



Sixth 

 instar. 



Length 



of larval 



life. 



15-771 



Hours. 

 69 

 81 

 45 

 69 

 69 

 69 

 69 

 81 

 69 

 69 

 93 

 69 

 69 

 81 

 69 

 69 

 81 



Hours. 

 60 

 36 

 72 

 72 

 72 

 60 

 72 

 60 

 60 

 72 

 60 

 72 

 48 

 48 

 48 

 48 

 60 



Hours. 

 60 

 72 

 48 

 72 

 72 

 60 

 48 

 72 

 60 

 48 

 60 

 48 

 48 

 60 

 48 

 72 

 48 



Hours. 

 72 

 72 

 72 

 48 

 48 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 

 72 



Hours. 



120 



144 



120 



72 



72 



72 



24 



120 



120 



72 



120 



120 



■ 120 



168 



144 



120 



240 



Hours. 



Hours. 

 381 

 405 

 357 

 429 

 453 

 453 

 453 

 405 

 381 

 477 

 405 

 381 

 357 

 429 

 381 

 381 

 501 



15-773 





15-774 





15-775 



96 

 120 

 120 

 168 



15-776 



15-777 



15-786 



15-788 



15-790 





15-791 



144 



15-795 



15-797 





15-925 





15-926 





15-927 





15-929 





15-933 





Average 





66 



59.6 



58.6 



69 



115.8 



127.6 



413.5 



Table VI. — Number of instars, their length, and length of larval life of Elasmopalpus 

 lignosellus, during the months of September and October, 1914, at Columbia, S. C. 



Number of 

 tube. 



First 



instar. 



Second 

 instar. 



Third 

 instar. 



Fourth 

 instar. 



Fifth 

 instar. 



Sixth 

 instar. 



Seventh 



instar. 



Length 



of larval 



life. 



1 



Hours. 

 209 

 153 

 165 

 165 

 117 

 129 



Hours. 

 72 

 84 

 108 

 84 

 156 

 120 



Hours. 

 108 

 72 

 204 

 252 

 108 

 144 



Hours. 



156 

 96 



132 

 96 

 84 

 72 



Hours. 

 120 

 192 



48 

 72 

 84 

 96 



Hours. 

 108 

 120 

 144 



288 

 288 

 216 



Hours. 

 144 



108 



Hours. 

 927 



885 

 799 

 957 

 837 



777 



2 



3 V ... 



4 





5 











Average 





156.3 



104 



148 



106 



102 



194 



156 



863.7 



