the canadian entomologist. 375 



home's system. 



Home, Everard (1756-1832), English naturalist. 



Metamorphogenoa — Having the embryo produced from an 

 egg which is formed in the ovarium, subjected to transformation 

 and breathing by air-tubes (spiracula) ; heart wanting, blood white. 



1. The embryo developed from eggs attached under the tail — lobster 



{Cancer). 



2. The embryo developed from eggs carried upon the anterior feet 



— spider {Aranea). 



3. The embryo developed from eggs deposited under the cuticle of 



the skin or stomach — gadfly [GEstrus). 



4. Embryos developed from eggs for several generations, im- 



pregnated at the same time — plant louse {Aphis). 



5. Embryos produced from eggs of one mother that compose the 



whole republic — bee {Apis). 



6. Embryos from eggs deposited under water — water moth 



{Phryganea) . 



The foregoing classifications are representative of what were 

 known as the wing, locality, transformation, mouth and egg 

 systems; those of Aristotle and Linnaeus being examples of the 

 wing system, those of Swammerdam and Ray & Willughby of the 

 transformation system, those of Aldrovandi and Vallisnieri and 

 one of Latreille's the locality system, and that of Lamarck the 

 cibarian or mouth system. Home's classification represents the 

 egg system and the tabulated one of Latreille's was known at one 

 time as the modern or eclectic system, being a combination of the 

 principles of several of the preceding ones. 



De Geer, Louis Gerhard, Baron (1818-1896) Swedish states- 

 man and writer, was also the inventor of a wing system. Cuvier, 

 Georges Leopold Chretien Frederic Dagobert, Baron (1769-1832), 

 French naturalist, and Fabricius, Johann Christian (1745-1808), 

 Danish entomologist and economist, both put forth systems based 

 on mouth structures, while Clairville, J, whose writings were 

 published between 1798 and 1806, Leach, William Elford, who 



