THE CLASSIFICATION OF ANIMALS 



11 



Study the wings of a sparrow, and compare their structure 

 and their functions with the structure and functions of the 

 fore legs of a rabbit. The wings of a sparrow and the fore 

 legs of a rabbit are homologous organs. 



Compare the mouth parts of a locust with those of a 

 butterfly. The locust chews its food, while the butterfly 

 sucks its food (nectar) from flowers. Note the striking 

 adaptation of structure to meet these functions. 



This work may be carried further, but, as it is emphasized through- 

 out all the practical work, perhaps further study here will not be 

 necessary. 



III. THE CLASSIFICATION OF ANIMALS 



Materials. Several specimens of tobacco worm and tomato 

 worm moths, members of the hawk-moth family, beetles, butter- 

 flies, flies, bugs, etc. 



Directions. During the summer collect several speci- 

 mens of the tobacco and tomato worm moths. If the 

 moths l cannot be obtained readily, find the larvae and rear 

 them in cages (see Appendix). By rearin'g the moths 

 more perfect specimens may be obtained. Also collect other 

 members of the Hawk-moth family, the Pandora Sphinx, 2 

 the Lesser Vine Sphinx, 2 etc., and some beetles, butterflies, 

 flies, and bugs. If it is more convenient to obtain butter- 

 flies, collect different species of the cabbage butterflies. 3 



A. Compare any two individuals of the tomato moths. 

 Note the shape of the fore and the hind wings. Note the 

 colors of the wings of each moth, and compare. Note the 



1 See the "Moth Book" by W. J. Holland, Plate IV, Figs. 1 and 2. 



2 Ibid., Plate III, Figs. 6 and 2. 



3 See "How to Know the Butterflies" by Comstock, Plates XIII 

 and XIV. 



