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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



trious species. Their hosts are bees of the genus 

 Andrena, Halictus, Eucera and Panurgus, none of 

 which the bright " warning colours " of Nomada 

 in the least resemble. The flight of the species 

 of this genus, as of other inquilines, is slow, list- 

 less and silent, quite different from the quick 

 energetic activity and busy hum of an industrious 

 bee. 



The Nomadce are sometimes particular but 

 often promiscuous in their inquilinism. So far 

 as observation by various authorities has gone, 

 however, the following species appear to associate 

 themselves with the under-mentioned hosts, viz. : 



N. Robertj eotiana 

 N. solidaginis 

 N. fticata - 



N. sexfasciata 

 N. alternate/, 



N. jacobcece - 

 N. Lathburiana 



N. albogutata 

 N. ruficornis 



N. bifida - 

 N. borealis - 

 N. lateralis - 



with Andrena analis and 

 ? Halictus rubicundus. 



„ Andrena nigriceps and 

 ? Halictus leucozonius. 



,, Andrena fulricrus, ? Ha- 

 lictus rubicundus, and 

 ? Halictus leucozonius. 



„ Eucera longicornis. 



,, Andrena atriceps, An- 

 drena nigro-cenea and 

 Andrena albicans. . 



,, Andrena fulricrus. 



,, Andrena labialis and 

 Andrena fulra. 



,, Andrena argentata. 



„ Andrena Trimerana, An- 

 drena atriceps, Andrena 

 fulra and Andrena nigro- 

 cenea. 



,, Andrena albicans. 



„ Andrena Clarkella. 



„ Andrena bucephala. 



