OITTDOOK INSI'X'TARV FOK HKAHINC I5KKTLKS. 



19 



Avith furrinj^. The sills of this liousc rested 'directly on the ground 

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

 shut off the direct sunlii^dit durin<j: hot weather. Shelves were placed 

 along; tlic 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 groat 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 inc]i(>s wide were used for a foundation and 

 the posts were S feet 

 in height. Several 

 partitions were 

 built in one side 

 of the house wliich 

 provided special 

 breeding compart- 

 ments (see PL III) ; 

 otherA\'ise the con- 

 struction was very 

 similar to tliat of 

 the building of the 

 previous year. 

 Little difhcult}^ 

 from excessive heat 

 was experienced in 

 this liouse and tliis 

 form of temporary 

 outdoor insectary 

 has been found ad- 

 mirably suited to 

 this line of work. 

 In tlie winter the 

 roof is removed and 

 the wire can be 

 taken off the sides 

 if desired, so as 

 to leave absolutely 





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

 from the earth. Arrow show.s tlie cavity where a Calosoma beetle 

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



natural conditions for the hibernating insects in the cages. 



In the spring of 1910 another liouse (PL 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 tlie center. (See PL IV.) The buihUng Avas very commo- 

 dious and convenient for work and was constructed for less tluin 

 SI 50. 



