518 Phylum Arthropoda 



sex ratios, for the difficult matching of the sexes in sexually dimorphic 

 species, for obtaining and having at hand living material in the winter 

 months, and for the study of the larval and pupal stages of rare and little 

 known species. In this way one may also rear species new to science, as 

 well as secure a large number of insects but rarely caught in the net. 

 This is especially true of the small insects which in field collecting are 

 overlooked or which, because of their small size, are able if caught to 

 crawl through the net and escape. The method outlined above may be 

 found a valuable supplement to others now in general or current use. 



