POND LIFE. j l j 



almost any pond. If you can obtain specimens of the 

 larger ones, they will be best for the purposes of study. 



Some specimens should 

 be kept alive in aquaria for 

 a study of their habits, and 

 some should be killed and 

 pinned for a study of their 

 structure. 



Place the pinned speci- 

 mens when not in use in 



FIG. 93. FIG. 94. 



your collection under a 



copy of the following- label and immediately after the 



whirligig-beetles :- 



Family DYTISCID^E (Dy-tis'ci-dae). 

 The Predaceous Diving-beetles. 



Whenever convenient to do so, watch the diving- 

 beetles and learn all you can regarding their habits. 

 Make a memorandum of whatever you learn; the 

 hints given on page 1 14 for the study of the whirligig- 

 beetles will be useful here. As these diving-beetles 

 are predaceous, they may be fed with other insects 

 or bits of raw meat. If properly cared for, they can 

 be kept alive in aquaria for a long time, even several 

 years. 



THE STRUCTURE OF THE PREDACEOUS DIVING- 

 BEETLES {School Work). Select for study specimens 

 of the largest species of predaceous diving-beetles in 

 your collection and observe the form of the following 

 parts : 



* No effort is made in these outlines to indicate a natural sequence 

 of the families studied. It will be sufficient for the purposes of begin- 

 ners to place each family under the order to which it belongs, placing 

 first those studied first. 



