( cxxi ) 



which deviates much from the rest of the species, in Amboiiia (vennta). 

 II. fuciformis occurs all over the Palaearctic Region, and reaches into India ; 

 it is se])arated into a western and an eastern subspecies ; Amurland, China, 

 and Japan have three species {sfaiirUiigi'ri, heresowskii, and railiKiis) not 

 occurring in the western district, and //. tityus does not go farther east than 

 the Alai Mountains, while //. croatica is confined to South-eastern Europe 

 and adjacent districts, ducalis to Central Asia, dentuta to Syria, and rubra to 

 Kashmir. The genus Celer'w, which is cosraoj)olitan, gives a special feature 

 to the Atlantic half of the Palaearctic Region, where it is more abundantly 

 developetl than anywhere else on the globe. The genus is doubtless an old 

 one, and had formerly more species in the tropics, the one each in Madagascar, 

 Argentina, Chili-Peru, Cuba, and the two on the Sandwich Islands being 

 remnants of a formerly less erratically distributed genus. The genus lias given 

 ofl' two branches : RhodaJ'ra in Southern Africa, and Pergesa in the Palaearctic 

 Region. Pergesa has four Palaearctic species, one ranging from West Europe 

 to Japan, China, and North India (elpenor), a second extending from AVest 

 Europe to Central Asia {porcellus), a third occurring in Central Asia (suellus), 

 and a fourth in Amurland and Japan (cts/folde/ts/'x). A fifth species of Pergesa, 

 closely allied to elpenor, is found in North India {rh'itlaris). 



The marked difference in the composition of the Sphingid fauna of the 

 Atlantic and Pacific Subregions of tlie Palaearctic Region is illustrated by the 

 following tables of distribution, in which the purely Oriental species which 

 range into Japan without having developed into Palaearctic subspecies are 

 not mentioned : — 



DISTRIBUTION OF THE GENERA OCCURRING IN THE 

 PALAEARCTIC REGION.* 



Tiie purely I'.ilaearctic genera are marked with an asterisk (*). 



