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THE CANADIAN ENTOMOLOGIST. 



ranges over the Southern States as far north as Southern Illinois, Indiana, 

 Ohio and Pennsylvania, while the fourth is confined to Texas. Lapara 

 with two species, one covering the territory from Florida to Canada and 

 west to the Mississippi Valley, and the other nearly the same area. 

 Exedrium with its single species is confined to Florida ; Marumba, also 

 with a single species, ranges over the United States and Canada. 

 Smerinthns with two species ; one covering the entire northern portion of 

 the United. States and Canada, and the other confied to the eastern section 

 from Virginia to Canada and west to Iowa, while the closely-allied genus 

 Paonias has three species, one being found from Pennsylvania to Canada, 

 and the other two from Florida to Canada and west to the Mississippi. 

 Cressonia has but one species, that occurs from Florida to Canada, and 

 west to the Mississippi River in the north and to Texas in the South ; the 

 last genus, Arciofiotus, has also a single species, that occurs throughout 

 the Pacific coast. 



Fig. 3. — Map illustrating the trend of diffusion in the Sphingida; of North America. 



When we consider the number of species that we know occur from 

 South America northward through Florida, and from there range more or 

 less north and west, but not sufficiently far west to indicate a Mexican 

 habitat, and those so closely allied to these, also distributed over the 

 eastern United States, we find that in this fiunily of insects the south- 



