CLASSIFICATION OF INSECTS. 



367 



Order 15. Lepidoptera.—'BoAy and wings covered with scales; 

 maxillsB lengthened into a very long tongue; larvse (cater- 

 pillars) with abdominal legs (Tinea, Geometra, Noctua, 

 Bombyx, Sphinx, Papilio). 



Ord^r 16. Hymenopt&ra.—'Wm^ clear, with few veins; mouth- 

 parts with a variety of functions, i.e., 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). 



Tabttlab View of the Sixteen Oedeks op Insbcta. 



t 



8 



Metabola 







I 









'^ ^ 





I 

 9< 



Ametabola. 



Thymnura. 

 (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 

 (Esophagus and crop — for example, of a locust — can be laid open, and 



