Sp. 4. Memythrus tibialis. — Mgeria tibialis. Fab. 



Sp. 5. Memythrus ? — Unnamed in the Linnaean 



cabinet. 



Several other species probably exist, with which I have not 

 happened to meet. 



The principal distinctions between Memythrus and iEgeria 

 are, that the antennae in the former are not longer than the 

 thorax ; in the latter they are much longer ; in the males of the 

 former genus they are decidedly pectinated, in those of the latter 

 but obscurely ciliated ; in the former the anterior wings are 

 always opaque, in the latter always hyaline. 



Natural Divisions to which the Sphinx Vespiformis of J 



Linnceus is referable. * 



First Primary Group ANIMALIA. 



First Kingdom ANNULOSA. 



Central Sub-kingdom INSECTA. 



First Class LEPIDOPTERA. 



Central Sub-class PHALJi^NA. 



Second Natural Order .... COSSI. 



Second Family ^GERIID^. 



Second Genus , . MEMYTHRUS. 



First Species VESPIFORMIS. 



R. CLAY, PRINTER, BREAD-STREET-HILL. 



