SEPTENARY SYSTEM. 245 



ployed would serve for each. I will, therefore, proceed to the 

 next division of my subject. 



Fabricius, as I have stated, thought and proclaimed that the 

 Alary System was defective and insufficient. In its place he at- 

 tempted the introduction of another, the Maxillary System. This 

 was to smoothe away all asperities in the path of Entomology. 

 He divided true insects into eight classes, five of which were 

 comprised in one group, and three in another. The first group 

 contained Coleoptera, Orthoptera, Hymenoptera, and Neurop- 

 tera, the last being divided by the separation of the Libellu- 

 lina from the remainder of its contents. The second group 

 contained Lepidoptera, Hemiptera, and Diptera. Subsequently, 

 Clairville, following up this Maxillary System, reunited the con- 

 tents of Neuroptera, and reduced the number of classes again 

 to seven. To the seven classes both Fabricius and Clairville 

 gave new names, which for the sake of simplicity, are here 

 omitted ; and Clairville adopting the groups of classes pointed 

 out by Fabricius, named them Mandibulata and Haustellata. 

 He placed his classes thus : — 



1. Mandibulata. 



I. Coleoptera. 

 II. Orthoptera. 



III. Neuroptera. 



IV. Hymenoptera. 



2. Haustellata. 



V. Diptera. 

 VI. Lepidoptera. 

 VII. Hemiptera. 



The collocation of classes, or of minor groups, is supposed to 

 indicate relation. It is to be observed that every relation thus 

 indicated in the Maxillary System is preserved in the Septenary. 

 I believe it is now pretty generally admitted, the term Mandibu- 

 lata is not sufficiently precise. All insects are furnished with 

 mandibles, and therefore all are mandibulate. " The division 

 is a dichotomous one. Like all dichotomies it consists of a 

 positive and a negative. It is this : — in the mandibulate 

 classes the mandibles do, in the haustellate classes the man- 



NO. III. VOL. IV. K K 



