400 ON THE ORDERS 



place. Thus, M. Latreille, in describing the genus Phyl- 

 losoma, which was one of the results of the unfortunate 

 Congo expedition, expresses himself in the following words : 

 " On a doniie a line Squille de la Medilerranee, genre de 

 la meme famille que la precedeiite, le nom de Mante, par- 

 ceqite ce a-ustace a quant a la forme de ses serves des rap- 

 ports avec les Orthoi^teres qui ont refu cette dernihe de- 

 nomination. II semble que la Nature ait vouhi, a fegard 

 des Plujllosomes, etendre ce parallile, et reproduire le type 

 defortne qiCelle a adoptee pour d'autres Orthopteres ranges 

 avec les Mantes par Linnmis, et qui composent aujourd'/im 

 le genre Phyllie" 



Turning also to the other side of the insects furnished 

 ^v^th mandibles, we may distinguish those relations of ana- 

 logy, which have an existence between the corresponding 

 ganglions of Mandibulata and Ametabola, to be still visi- 

 ble between these last and the corresponding groups of 

 Haustellata. Thus says Degeer, in describing the larvae 

 of the Latreillian genera Erycina and Polyommatus, 

 " Celles sont les Chenilles-Cloportes, ainsi nommees parce- 

 qu'elles ressernhlent en quelque maniere aux Cloportes, 

 ay ant le corps trh applati, mais large, etportant ordinaire- 

 ment la tete cachee sous le premier anneau du corps: elles 

 marchent aussi ires lentement en glissant pour ainsi dire 

 sur le plan de position." And if Lepidopterous larvae 

 sometimes thus imitate the more eccentric forms of the 

 corresponding order of Chilognatha, every one knows that 

 their ordinary shape is that of an lulus. Nay, the rule 

 of analogy between corresponding groups is so strictly ob- 

 served, that we may even trace vestiges of it all the way 

 from the Lepidoptera to the analogous point of the Crus- 

 tacea, although they become at last very vague. No 



