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FIRST BOOK OF ZOOLOGY. 



These lines show the separation of the abdomen into rings, 

 or segments. In insects with lengthened and slender ab- 

 domens the segments are long, and the abdomen, when bent 

 or curved, bends at these joints, as shown in Fig. 67. 



Fig. 67. — Insect with a Long, Slendek Abdomen. 



If the pupil can handle these parts delicately enough, 

 he may be able to separate the abdomen at these joints, 

 into a series of rings, or segments, and glue them on a card, 

 marked " Rings or segments of the abdomen." In the grass- 

 hoppers the segments show very plainly. On the hinder 

 part of the abdomen there are various appendages, some- 

 times so short as to be scarcely perceptible, sometimes long, 

 and thread-like, as in the May-fly (Fig. 98) ; again, in the 

 shape of a sharp sting, as in the hornet. In the cricket, they 

 are quite long and conspicuous. These appendages vary 

 greatly in different insects. 



