74 



CALOSOMA SYCOPHAXTA. 



was covered with fine-mesh copper wire to provide air, while on the 

 top a sliding cover was arranged so that the holes could be closed as 

 they were filled. Ten of these units were strapped together and were 

 convenient to carry, and the colony (200 larvae) which they contained 

 could be liberated very rapidly by withdrawing the cover, inverting 

 the unit, and giving it a sharp rap to shake out the insects. 



Table XIX shows the number of living beetles imported and the 

 number of beetles and larva? colonized since the work began. 



Table XIX. — Number of living Calosoma sycophanta imported: and number of beetles 

 and larvae of Calosoma syeophanta colonized. 



Year. 



Re- 

 ceived. 



Col- 

 onized 

 from 

 importa- 

 tions. 



Reared and col- 

 onized. 





Adults. Larvae. 



1900 



093 

 907 

 675 

 405 

 1,305 



3S9 

 578 

 430 

 250 

 1,064 





1907 





1908 - 



2 300 



1909 - 



6 100 



1910 



452 6,380 





Total 



4. 045 



2,711 



452 i 14.7^0 



Fig. 22.— Three "sets," each containing 10 units, each unit holding 20 Calosoma larva in separate 

 cells, so that each set contains 200 Calosoma larvse or enough for a colony. (Original.) 



During 1906 and 1907 the number of Calosoma beetles liberated 

 was comparatively small and the following two years only a moderate 

 number was colonized. It should be borne in mind that the present 

 condition as regards the abundance and dispersion of this species in 

 the field is due to the colonies liberated during the first two or three 

 years rather than to those which have been planted since that time. 

 Attention should be called to the fact that nearly as many beetles 



