NORTH AMERICAN LEPIDOPTERA. 55 



The genus Sphinx is here defined as follows : Palpi duo rejlexi, 

 piloxi. Llngita spiralis plerisque exserta. Antenna' squammaUe.''' 



The genus is headed by ocellata, followed by lugubris, then the 

 other European Smerintklds and then the other Sphinges in no })ar- 

 ticular order. The Linnaean idea of dentate and non-dentate wings 

 seems to have controlled the arrangement. 



On page 547 of the same work he creates his genus Sesia, defining 

 it as follows : " Palpi reflexi. Lingua exserta, truncata antenmn cylin- 

 driae, extrorsum crassiores." 



The first species is our tantalus, then hylas, of China, then stella- 

 tarum, of Europe, then the clear wings, thysbe and fucifarmis. These 

 are all allied, at least in some respects, but the following species are 

 those later termed by him jEgerla. 



Zygmna is defined on page 550 as having : " Palpn reflexi. Lingua 

 exserta setacea. Antennce scepius medio crassiores." 



Z. phnlus is the only American representative. In the other, sub- 

 sequent published works of this author, no changes are made in this 

 group, save that new species are added, described since the preceding 

 period of publication. 



In 1777, Scopoli proposed the genus Macroglossa iov the European 

 stellatarum and allies. 



In 1801 Laspeyres, in his "Sesice Europce Iconibuset Descriptionibus 

 illustrata'," excludes from the genus Sesia all those species not allied 

 to tipidiformis. 



In 1805, Latreille, in the Histoire Nat. des Crust, et Ins. vol. xiv, 

 calls his second family Sphingides, divided as follows : 



Sphi)ix. — AntennaB thickened to a prismatic club, with a simple 

 thread at tip ; tongue present. 



Atropos, ligustri, convolvuli, elpenor, euphorbice, miotherm, stellatarum, 

 fuciforni is, bombyliformls. 



Smerinthus. — Antennaj i)rismatic, pectinate or serrate, hooked at 

 tip ; tongue very short, or nearly wanting. 

 S. tilice, ocellata, pop)uli, quercus. 



Sesia. — Antennae spindle shaj)ed, a little incurved, at tij) with a 

 little scaly tuft ; palpi nearly clavate, second joint stouter, clothed 

 with hair or scales. 



'S'. apiformis, tipulifonnis, culiciformls. 



Zygcena.—Antemr<e spindle shaped, often curved, without scaly 

 tuft. Palpi nearly clavate, the second joint not more strongly clothed 

 with hair than the others ; tongue present. 

 Z.fllipcndula', lofi, scabiosa, statiri.^ etc. 



