GEOGRAPHY OF THE GENERA. 67 



Our native species are found throughout France and Ger- 

 many, Greece and Spain, still one or two seem limited 

 to our islands. The genus is recorded as in Albania, 

 Algeria, and Egypt ; it is found on the western edge of 

 Africa at the Canaries; it occurs also in northern 

 India, in the United States, on the western side of South 

 America at Chili, and then we have a wide gap, for 

 its next appearance is at Sydney, New South Wales. 

 About twenty species are known. 



The genus ANDRENA, although infinitely more nume- 

 rous in species than the genus Halictus, which is also 

 abundant, does not appear to have so wide a distribution 

 as the latter. Peculiarities of habits possibly limit its 

 diffusion, although nothing has occurred to naturalists 

 to explain the circumstance, unless it be the adventi- 

 tious fact of no specimens having fallen into the hands 

 of the collector. Our own species, represented by one 

 or several members, are found (although some seem re- 

 stricted to England) throughout Europe, north and 

 south, east and west, as also in its islands. In Africa it 

 is seen in Algeria and Egypt, and it occurs in theCanaries; 

 arid in Asia it is found in Siberia, and in northern India ; 

 but we have no connecting chain to link those Asiatic 

 and African localities, although we may well sup- 

 pose that it might be discovered amongst the steppes 

 of Thibet and Tartary, revelling amidst the flowers of 

 their luxuriant pastures, and even amongst the Persian 

 sands. It passes through the United States from Flo- 

 rida up and to our own colony of Nova Scotia, and 

 extends its range to Hudson's Bay. We do not trace it 

 further. Nearly two hundred species occur. 



The genus CILISSA, too, has a limited distribution, 

 and occurs in the same countries, but ranges as high 



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