500 



INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 



then safely mounted. Any glass or porcelain dish with a close fitting 

 lid may be vised for this purpose. A few layers of blotting paper in 



Fig. 497. — Pinned insects. Side view of a butterfly and 

 moth pinned through the mesothorax. The wings are 

 not properly spread in either specimen. (Original) 



the bottom serve to hold the moisture and a small amount of flaked 

 naphtha will prevent mildewing. It requires from 12 to 24 hours for 

 relaxing in such a chamber. 



Pinning. — Practically all of the adult insects, excepting the very 

 small ones, are pinned. Ordinary house pins can not be used, because 



Fig. 40 8. — Pinned insects. Flies at the top and a bee and 

 wasp at the bottom. All pinned through the mesothorax. 

 (Original) 



they are too short and usually too large in diameter. Therefore, spe- 

 cial insect pins are manufactured for this purpose. They are aboivr 



