THE CANADIAN ENTOMOLOGIST 373 



I-. Winged insects: 



1. With four wings. 



a Upper wings more or less crustaceoiis, the under wings 

 membranaceous. 

 Upper wings quite crust£iceous and not overlapping 



(Coleoptera). 

 Upper wings semi-crustaceous and overlapping — bugs, 

 grasshoppers (Hemiptera) . 

 b Upper and under wings of same texture. 



Wings covered with small tiled scales — butterflies and 



moths (Lepidoptera). 

 Wings membranaceous and naked, 



Without a sting — dragon-flies, etc. {Neiiroptera). 

 With a sting — wasps, bees (Hymenoptera). 



2. With two wings — flies, gnats, etc. (Diptera). 



II. Wingless insects (Aptera). 



Lamarck's system. • 



Lamarck, Jean Baptiste Pierre Antoine De Monet, Chevalier 

 de (1744-1829), French naturalist. 

 I. Insects with jaws: 



1. With wing-cases — beetles {Coleoptera). 



2. With straight wings — crickets, etc. (Orthoptera). 



3. With four equal wings — dragon-flies (Neuroptera.) 

 II. Insects with jaws and a sort of sucker. 



- 4. With four unequal wings — bees, etc. (Hymenoptera). 



III. Insects with no jaws but having a sucker. 



5. With powdery wings — moths, etc. (Lepidoptera). 



6. With upper wings of unequal consistence — bugs, etc. 



(Hemiptera) . 



7. With two wings — flies, etc. (Diptera). 



8. Without wings (Aptera). 



latreille's system. 



Latreille, Pierre Andre (1762-1833), French naturalist. 

 I. Insects with more than six feet and without wings (Myriapoda) . 



1. With many jaws — woodlice (Chilognatha) . 



2. With many feet — millipedes (Chilopoda). 



