Matvivorous habit of the species of Hetcrogynis. 17!) 



other species, and the difference in size is largely expressed 

 not in the size or number of her eggs, but in the mass of 

 eatable materials she represents after her decease. At 

 any rate the young larva? get larger than do those of the 

 other species, and undergo their first moult before penetrat- 

 ing the pupa-case and cocoon and venturing to appear at 

 large. 



A pupa-case of H. paradoxa £, from which the young 



Fig. 2. 



larva? have emerged, presents a dirty and muddled aspect 

 due to the presence of a good deal of spinning by the 

 young larvae, amongst which the skins they cast at their 

 first moult are entangled. 



A very interesting point is that there is no trace of 

 larval frass present in either species. This one can more 

 easily understand perhaps in the case of H. penella, where 

 the total amount of maternal tissue is small, and each larva 

 gets but little, as evidenced by their small size on emerging 

 from the parent cocoon. But in the case of H. paradoxa 

 the amount must be considerable, as the larva? grow very 



