Hosts of Insect Eggparasites in Europe, Asia. Africa and Australasia. 239 



Gonatocerus and Polynema and of the Trichogrammatidae such as 

 Ollgosüa and Trichogramma. Indeed, the latter family strikes me as 

 being a rising one and eggparasitism strikes me as being on the increase, 

 seemingly opening up a new, attractive and iinfailing soiirce of food for 

 those insects which are variable enough and adaptive enough to avail 

 tiiemselves of it. 



A Single species of parasite may have a great many diflferent 

 hosts scattered over several Orders, either in the same locality or over 

 many different localities (e. g. Trichogramma minutum Riley). On the 

 contrary, a single host species may have several or more parasites of 

 different groiips in the same locality. As many as three distinct genera 

 of Trichogrammatidae have been reared from the eggs of Horiola 

 arquata at the same time and in the same place; from Anasa tristis an 

 encyrtid, three congenerie species of a scelionid and a eupelmid have 

 been reared at different times. The majority of hosts are Lepidopterous 

 and this is more or less significant because the eggs of this order of 

 insects are usually deposited in masses and nearly always in exposed 

 sitaatioiis; therefore they are readily seized upon. It must not be 

 supposed, however, that the use of eggs as hosts is limited by this 

 condition, since the Hemiptera and Orthoptera are also commonly and 

 abundantly used as hosts and a large number of these place their eggs 

 in hidden places, quite often into the woody twigs and stems of trees 

 aud shrubs or gathered into specially hardened cases. 



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