314 GLOSSARY. 



Hymenoptera. — An order of insects possessing biting jaws and 

 usually four membranous wings in which there are a few veins. 

 Bees and Wasps are familiar examples of this group. 



Hyperteophied. — Excessively developed. 



loHNEUMONiD^. — A family of Hymenopterous insects, the mem- 

 bers of which lay their eggs in the bodies or eggs of other 

 insects. 



Imago. — The perfect (generally winged) reproductive state of an 

 insect. 



Indisens. — 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 material enclosed in v 

 delicate membrane, the whole or part of which is furnishei^ 

 with short vibrating hairs (called cilia), by means of which th<. 

 animalcules swim through the water or convey the minute par- 

 ticles of their food to the orifice of the mouth. 



INSECTIVOROUS. — Feeding on Insects. 



Invertebrata, or Invertebrate Animals. — Those animals which 

 do not possess a backbone or spinal column. 



LacunjE. — Spaces left among the tissues in some of the lower ani- 

 mals, and serving in place of vessels for the circulation of the 

 fluids of the body. 



Lamellated. — Furnished with lamellae or little plates. 



Larva (pi. Larv^).— The flrst condition of an insect at its issuing 

 from the egg, when it is usually in the form of a grub, cater- 

 pillar, or maggot. 



Larynx. — The upper part of the windpipe opening into the gullet. 



Laurentian. — A group of greatly altered and very ancient rocks, 

 which is greatly developed along the course of the St. Lau- 

 rence, whence the name. It is in these that the earliest known 

 traces of organic bodies have been found. 



Leguminos^. — An order of plants represented by the common Peas 

 and Beans, having an irregular flower in which one petal stands 

 up like a wing, and the stamens and pistil are enclosed in a 

 sheath formed by two other petals. The fruit is a pod (or 

 legume). 



