( cxxi ) 



which deviates much from the rest of the species, in Amboina (venata). 

 //. fiu'iformis occurs all over the Palaearctic Region, and reaches into India ; 

 it is separated into a western and an eastern subspecies ; Amurland, China, 

 and Japan have three species (statirlinyeri, beresownkii, and railiuns) not 

 occurring in tlie western district, and H. titijiis does nut go farther east than 

 the Alai Mountains, while //. croatira is contiued to Sonth-eastern Europe 

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

 Kashmir. The genus Celerio, which is cosmopolitan, gives a special feature 

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

 developed 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, Cnba, and the two on the Sandwich Islands being 

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

 off two branches : Rliodafra in Southern Africa, and Peryesa in the Palaearctic 

 Region. Pcrgesa has four Palaearctic sj)ecies, one ranging from AVest Enrojie 

 to Japan, China, and North India (eljM'iwr), a second extending from West 

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

 and a fonrtli in Amurland and Japan {((sltoldensia). A fifth species of Pergesa, 

 closely allied to elpeiior, is found in North India {rieularis). 



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

 Atlantic and Pacific Subregions of the 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 GKNERA OCCURRING IN THE 

 PALAEARCTIC REGION.* 



* The purely I'.ilaoarctic genera are marked wiUi an asterisk (*). 



