( cxxxv ) 



early jieriod of the histdry of Splnm/idar, since otherwise an interchange of the 

 widely distributed genera, like the Old World Philampelinae: DeiUphila and 

 Ni'jiliele, and the New World Si'.t/i??a/> .- PKruthap/iinr, Evinw/i.^, Paclii/lin, etc., 

 would have heen the unavoidalile conseqnence of tiie presence of some Icind of 

 geographical bridge between tropicnl West and East. In the Cliorrordw/iiiinr 

 we have again a similar kind of distribntion. The Neotropical Region lias only 

 the genus Xi/lophancs, besides the cosmo])olitan Celerio and a derivation from 

 Xylophanes. All the eleven Old World generalised and specialised genera have 

 been debarred from entering the New World, though they are qnick flyers and 

 mostly of wide distribution ; and the Neotropical genus Xj/lop/iai/rti, though very 

 generalised, has no representative in the Eastern Hemisphere. 



The affinity which exists between the Neotropical Region and the Tropics 

 of the Old World is geologically remote, but phylogenetically close. The 

 distinction between close blood-relationship in the faunae which means recent 

 geographical connection, and close blood-relationship which indicates remote 

 geographical relation of the countries, which distinction is clearly demonstrated 

 by the distribution of the Hphingidae^ is of the highest importance in studies of 

 geographical distribution. The distinction is entirely eflFaced and the student led 

 astray, if the genera are not studied and defined with the view of giving in the 

 classification adequate expression to tlie phylogeny of the family. 



We divide the SphirKjiihir into tlie following groups: — 

 A. Splii)iyifluc (isniiiiinoplmrar. — ji. '■'>. 



Subfamily Ac heronti i nae .— p. 4. 



Tribe Acherontiicae. — ji. 4. 

 Tribe Sphingicae. — p. 27. 

 Tribe Sphingulicae. — ji. I."i4. 



Subfamily A m b u I i c i nae .— p. UiO. 



I). Hphinijiiliie tn'iiiinniiiliordi'. — p. :5-l7. 



Subfamily Sesiinae.— p. ;!4'.i. 



Tiibe Dilophonoticae. — ]i. iW.i. 

 Trilie Sesiicae. — p. :i7','. 



Subfamily Ph i lam pe I i nae.— [i. 47.1. 



Tribe Fhilampelicae. — p. 47."). 

 Trilie Nephelicae.— ]i. 4'.t8. 



Subfamily Choe roca m p i n ae .— p, <')72. 



