DISTRIBUTION OF INSECTS INTO ORDERS. 27 



either those of the osculant groups connecting the orders, or of 

 those insects which point out the connection of the orders. 



Distribution of metamorphotic ivinged Insects from the " Horce Entomo- 

 logicce" ii. p. 367., ayid " Linnaan Transactions" xiv. p. 67. 



MANDTBULATA. Relations of Analoyij. II AUSTELL ATA. 



1. Trichoptera IK. fMetivmorphosis obtected. "j 



(Phryganea, Perla, -j Larva with membranous \l. Lepidoptera Z»i7j. 



Tenthredo. ) |_ legs. J 



Ord. Bomboptera M. L. G. Pferophorus. 



( G. Sirex. ) G. Psychoda. 



,, XT r • f Metam. incomplete or 1 



2. HyjiENOPTERA Linn. I ^ ^ ' I , t-v > • 

 n i\/r J A t A coarctate. V'2. Diptera Arist. 

 O. Mi/rmecoaes. Ants. It i -^ I 



(_ Larva apod, or vermiform. J 



O. Sfrepsiptera K. Fam. Hippoboscida. 



G. Atractocerus. G. Nycteribia, leading 



to Arachnidous class. 



3. Coleoptera Arist. Metam. incomplete. 3. Aptera (the Flea). 



Larvae various. ( Larva apod, but of Co- 



leopterous structure). 

 O. Dermaptera Leach. 

 ( Earwig. ) 



y, ri r\T r IMetam. semicomi)]ete. "1 4. IIesiiptera Linn. 



4. Orthoptera Ohv. \ , i 1- i I , r^ ^- V 



(^ Larva resembhng Imago. J ( G. Cimex.) 



G. Mantispa. Fam. Hydrocorisa. 



O. liaphioptera M. L, 

 ( G. Boreus. ) 



Metam. various, includ-' 



ud--| 

 5. Neuroptera Ztw/i. «j ing subsemicomplcte. l 



HOMOPTERA. 



_ La'^vi;;;;;;!""'"^^^' j ^ g. ac«.f«, &c. ) 



O, Megahptera (G. J^fa^a limbata Fab. & 



Sialis). Perlides, lead- G. Aleyrodes, leading 



ing to Trichoptera. to Lepidoptera. 



The point of connection of the two circles, formed by the returning 

 of these two series into themselves, is supposed to exist between the 

 Trichoptera, and Lepidoptera, being effected by such species of the 

 latter as have very long antennae, like the Adelae, and such as have 

 the trophi obsolete, as Aglossa. 



That objections existed against this mode of classification on 

 various points of view, Mr. MacLeay was well convinced, and of which 

 indeed he has enumerated several in the sixth Chapter of the Horce 

 EntomologicfP, besides which it may be urged that the minor details, 

 and especially the construction of the majority of the osculant groups 

 and orders are quite untenable Still, however, as a whole, it must 

 be admitted that the various Metamorphotic, Alary and Cibarian cha- 

 racters have never before been brought to bear together with such 

 weight as in the system now before us ; which, far from regarding as 

 all-perfect, I would rather consider as the first stepping-stone towards 

 a natural system not founded upon a linear series of affinities, but 



