14 INTRODUCTORY REMARKS. 



The first of these genera he divides into four fami-* 

 lies, viz. Crahro, Fespa, Bomhylius, and ^pis; and 

 the latter into two, viz. Ichneumon and Musca 

 Tripilis. This outline contains no enumeration of 

 species. In the second edition, published five 

 years afterwards, (1740) the gexmme, Hymenoptera 

 are at length placed by themselves under the name 

 oi Gymnopterair), but the number of genera re- 

 mains the same, only the order of families in Apis 

 is changed (^). This may be called the aera of this 

 natural class, when it received a separate existence. 

 In the fourth edition, which appeared in 1744, it 

 had its present name assigned to it {Hijmenoptera) 

 and is defined, Alcu Memhranacece. Linneus now 

 arranged the insects in it under four genera, viz. 

 Tentredo{t), Ichneumon {u), Apts{x), Formica {y). 

 In 1746 the first edition of that admirable work, 

 the Fauna Suecica, was published, giving the same 

 number of genera in this class, but reducing the 

 families in Apis to three (z). Species are now enu- 

 merated for the first time with the addition of 

 Nomina specijica, and descriptions. In this Ten- 

 thredo includes Cynips, Tenthredo, Sirex and some 

 of the Ichneumones minuti. Ichneumon unites 



(/•) Them. yv^Jim^, nudus, and TTTspov ala. (s) Apis, Cra- 



Iro, Bomhylius, Fespa. (t) Aculeus ani dentatus. 



(u) Aculeus ani triplex. {x) Actileus ani simplex. 



('(/) Squama erecta thoracem ab abdomine distinguens, alee 

 neutris nullce. (%) Viz^. * Fbspce. *■ * Apes propric 



dictce, * * * Bomlylii hirsuti. 



some 



