REPORT OF THE STATE ENTOMOLOGIST I909 



21 



Experiments with brown tail moth caterpillars 



Series i, January 15, 1909 



Number of 

 experiment 



Grains 

 cyanide 



Hours 

 exposed 



Number 



of 

 larvae 



Observations at 



close of 



fumigation 



Later observations 



4 ... 



I 

 I 

 I 

 I 



r 



1 



1 



i 



3 



3 



I 

 21 



I 

 21 



3 



I 



3 



21 

 3 



6 



4 

 4 

 4 

 4 

 4 

 5 

 4 



4«&nest 



4 " 



4 



4 

 4 & nest 



4 " 



All dead 



Same i8th 20th 









8 



Apparently dead . . 

 Dead 



I alive on i8tli and 2otli 



Q 



Same, i8th and 20th 









2 



Dead 



Same i8th, 20th 







10 



3 alive 1 8th- 2, 20th 

 Exposed caterpil- 

 lars dead 



Apparently dead. . . 



All dead 



Alive in nest 







6 



All exposed caterpillars 



dead i8th, 20th, most in 



the nest dead 

 Apparently dead i6th, i 



alive the i8th, all dead 



the 20th 

 Same, i8th, 20th 





12 



2 alive 



2 alive the 20th those in 





Exposed caterpil- 

 lars dead 



nest alive 





Same, i8th, caterpillars hi 

 nest alive 



Series 2, January 2c 

 Dead. . 







Series 3 , / 



\ 



I 



8 



■g- 



I 



8 



i 



2 



8 



k 



2 



8 



^ 



3 



8 



* 



4 



8 



i 



I 



8 



* 



I 



8 



* 



2 



8 



X 



2 



8 



i 



3 



8 



h 



4 



8 



Apparently dead. 



January 21, 1909 

 Dead 



Same, the 21st 



Alive 



Apparently dead. 



Dead 



Apparently dead.. 



Dead 



Series 4, January 28, 1909 



All apparently dead 



3 



10 



3 



10 



3 



10 



2 



10 



3 



10 



3 



10 



I alive 2ist, 2 2d 

 Same, the 22d 



Same, 22d, 23d 



Several alive the 23d, 

 small piece of web pres- 

 ent 



Same, the 22d 



Several alive the 23d, 

 pieces of nest present 



Same, the 23d 



All dead the 



1 ^ grain equals approximately i ounce to 100 cubic feet of space. 



