174 



PRACTICAL MICROSCOPY. 



fly, with white-banded abdomen ; 6, large yellow saw-fly ; 

 7, yellow saw-fly with black thorax. 



The saw-flies are common everywhere, especially in the 

 neighbourhood of gooseberry bushes ; the saws are really a 

 part of the ovipository arrangement, and are attached of 

 course to the abdomen of the females. 



FIG. 161. 



The sting and poison-bag of the bee is not difficult to 

 obtain (that of the humble-bee is shown in Fig. 162), 

 though the student will find perhaps that it requires deli- 

 cate manipulation to separate the long tubular gland from 

 the tracheae ; this may, however, be done with very smooth 



