CLASSIFICATION OF INSECTS. 367 
Order 15. Lepidoptera.—Body and wings covered with scales; 
maxille lengthened into a very long tongue; larve (cater- 
pillars) with abdominal legs (Tinea, Geometra, Noctua, 
Bombyx, Sphinx, Papilio). 
Order 16. Hymenoptera.—Wings clear, with few veins; mouth- 
parts with a variety of functions, i¢., biting, lapping 
liquids, etc. In the higher families the thorax consists of 
four segments, the first abdominal segment of the larva 
being transferred to the thorax in the pupa and imago. , 
Metamorphosis complete (Tenthredo, Cynips, Ichneumon, ' 
Sphex, Vespa, Apis). 
TABULAR VIEW OF THE SIXTEEN ORDERS OF INSECTA. 
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Metabdola | Ametabola. 
Thysanura. 
(Campodea.) 
Laboratory Work.—In dissecting Myriopods, spiders, and insects, the 
dorsal portion of the integument should be carefully removed with 
fine scissors, leaving the hypodermis untouched; this should then be 
raised, disclosing the delicate heart or dorsal vessel. The alimentary 
canal will be found passing through the middle of the body; it should 
be laid open with the scissors, or, better, a hardened alcoholic specimen 
can readily be cut in two longitudinally, and if the section is true, the 
cesophagus and crop—for example, of a locust—can be laid open, and 
