OUTDOOR INSECTARY FOR REARING BEETLES. 



19 



with furring. The sills of this house rested directly on the ground 

 and canvas curtains were provided on the south and west sides to 

 shut off the direct sunlight during hot weather. Shelves were placed 

 along the inside walls of the house and the earth on each side of a 

 central walk was used for ground rearing cages. 



It was found that the heat was too great in the top of the house 

 during midsummer, and the following spring, when it was necessary 

 to have more space for beetle rearing, another house (PI. II, A) was 

 built. Cement walls 4 inches wide were used for a foundation and 

 the posts were 8 feet 

 in height. Several 

 partitions were 

 built in one side 

 of the house winch 

 provided special 

 breeding compart- 

 ments (see PL III) ; 

 otherwise the con- 

 struction was very 

 similar to that of 

 the building of the 

 previous year. 

 Little difficulty 

 from excessive heat 

 was experienced in 

 this house and tins 

 form of temporary 

 outdoor insectary 

 has been found ad- 

 mirably suited to 

 this line of work. 

 In the winter the 

 roof is removed and 

 the wire can be 

 taken off the sides 

 if desired, so as 

 to leave absolutely 

 natural conditions for the hibernating insects in the cages. 



In the spring of 1910 another house (PI. II, B) was built very similar 

 to the one constructed the previous year. It covered 12 by 15 feet 

 on the ground and was fitted with shelves on all sides and a large 

 table in the center. (See PI. IV.) The building was very commo- 

 dious and convenient for work and was constructed for less than 

 $150. 



Fig. 10.— One of the cages shown in figure 9 that has been removed 

 from the earth. Arrow shows the cavity where a Calosoma beetle 

 hibernated; enlargement shows this beetle in the cage. (Original.) 



