BEUTENMULLER, MONOGRAPH OF THE SESIIDAE. 223 



Hind wings with veins M 3 and Ciij from end of cell. 

 Hind tibiae with short hairs. 



Palpi ascending, clothed with very long hairs. 



Anal tuft of male straight or with four anal pencils Memythrus. 



Palpi with short hairs. 



Anal tuft of male divided centrally Albuna. 



Hind wings with veins M 3 from middle of cell ; Cuj from end of cell. 

 Hind legs clothed with very long, thick hairs. 



Palpi with short, loose hairs Melittia. 



Historic Review of Generic Names. 1 



The first species belonging to the family at present under consideration 

 were described by Linne in his ' Systema Naturae,' 1758, and were placed by him 

 in the third division of the genus Sphinx, together with a mixture of other 

 species belonging to different genera. In this respect he was followed by many 

 of the earlier writers. No changes regarding the generic position were made 

 by Linne in his subsequent writings. 



In 1775 (11) Fabricius divided the Linnaean genus Sphinx into three 

 groups, viz : Sphinx, Sesia, and Zygcena, he using the name Sesia in the widest 

 sense for practically the same species mentioned by Linne in the third division 

 of the genus Sphinx. They are as follows : Sesia tantalus, hylas, stellatarum, 

 thysbe, fuciformis, apiformis, hcemorrhoidalis, culiciformis, and tipuliformis. The 

 first five species are referable to the Sphingidae and the other four to the 

 Sesiidae. 



In 1777 (21) the same writer restricted the name Sesia to Sphinx (= Homce- 

 ocerd) melas of Cramer, a species belonging to an entirely different family from 

 the species originally placed by him in the genus Sesia, consequently the 

 restriction is invalid. 



During the same year (19) Scopoli erected the following genera : Spectrum 

 (=Sphinx), with 5! ligustri and S. euphorbice as the types ; Macroglossum, with 

 Sphinx stellatarum as the type ; Anthrocera, with Zygcena filipendulce as the type ; 

 and Trochilium is used for the species probably referable to the Sesiidae, but he 

 does not apply the name to any particular species. The diagnosis of the genus 

 Trochilium is as follows : 



" Alae pellucidae abdomen apice saepius, barbatum. Larva piles albis, 

 exiguus, pubescen. Pupa folliculata." 



The description leaves room for considerable speculation as to what species 

 he intended to place in this genus ; the same applies to Hemaris as well as to 

 Sesia. I would herewith propose to reject the name. 



Latreille in 1796 (48) gave a diagnosis of the term Sesia which is as follows : 

 11 Antennae rentiers vers leur milieu, terminees par un fillet. Antennules 



1 The numbers in parentheses correspond with those of the numbered titles in the Bibliography given at the end 

 of this paper. 



