GLOSSARY 326 



centiped, etc., is composed. The latter is called serial 

 homology. The parts which stand in such a relation to 

 eacb other are said to be homologous, and one such part 

 or organ is called the homologue of the other. In differ- 

 ent plants the parts of the flower are homologous, and 

 in general these parts are regarded as homologous with 

 leaves. 



HoMOPTERA, — An order or sub-order of Insects having (like 

 the Hemiptera) a jointed beak, but in which the fore- 

 wings are either wholly membranous or wholly leathery. 

 The Cicadce, Frog-hoppers, and Aphides, are well-known 

 examples. 



Hybrid. — The offspring of the union of two distinct species. 



Hymenoptera. — An order of Insects possessing biting jawa 

 and usually four membranous wings in which there are 

 a few veins. Bees and Wasps are familiar examples of 

 this group. 



Hypertrophied. — Excessively developed. 



IcHNEUMONiD^. — A family of Hymenopterous insects, the 

 members of which lay their eggs in the bodies or eggs 

 of other insects. 



Imago. — The perfect (generally winged) reproductive state 

 of an insect. 



Indigens. — The aboriginal animal or vegetable inhabitants 

 of a country or region. 



Inflorescence. — The mode of arrangement of the flowers 

 of plants. 



Infusoria. — A class of microscopic Animalcules, so called 

 from their having originally been observed in infusions 

 of vegetable matters. They consist of a gelatinous ma- 

 terial inclosed in a delicate membrane, the whole or part 

 of which is furnished with short vibrating hairs (called 

 cilia), by means of which the animalcules swim through 

 the water or convey the minute particles of their food to 

 the orifice of the mouth. 



Insectivorous. Feeding on Insects. 



