74 



CALOSOMA SYCOPHANTA. 



Avas covered with fine-mesli copper wire to i)rovide air, while on the 

 top a sUding 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 larvte) which they contained 

 could be liberated very rapidly by withdrawing the cover, inverting 

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



Table XIX shows the number of hving beetles imported and the 

 number of beetles and larvse colonized smce the work began. 



Table XIX. — Ninnher of living Calosoma sycophanta imported: and nitmhcr of beetles 

 and larvae of Calosoma sycophanta colonized. 



Yoar. 



1906 



1907 



1908 



1909 



1910 



Total 



ceived. 



693 

 907 

 675 

 405 

 1,305 



4,045 



Col- 

 onized 

 from 

 importa- 

 tions. 



430 



250 



1,064 



Reared and col- 

 onized. 



Adults. Larvse 



2,300 

 6,100 

 6,380 



Fig. 22.— Three "sets," each containnm JO units, each unit holding 20 Calosoma larvse in separate 

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



During 190G and 1907 the number of Calosoma beetles hberated 

 was comparatively small and the following two years only a moderate 

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

 condition as regards the abundance and dispersion of this species in 

 the field is due to the colonies liberated durmg 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 



