Elementary entomology (1912) Elementary entomology elementaryento00sand Year: 1912 CHAPTER VII BRISTLETAILS AND SPRINGTAILS (APTERA) Characteristics. Wingless insects which have no metamorphosis. Mandi- bles and maxillce retracted within the head, but used for biting and chewing soft substances. True compound eyes rarely present; a group of simple eyes on each side of head in some genera. Abdomen sometimes furnished with rudimentary jointed appendages. This is a relatively unimportant order from the economic stand- point, but is of interest from the fact that it includes the most Fig. 87.
Elementary entomology (1912) Elementary entomology elementaryento00sand Year: 1912 CHAPTER VII BRISTLETAILS AND SPRINGTAILS (APTERA) Characteristics. Wingless insects which have no metamorphosis. Mandi- bles and maxillce retracted within the head, but used for biting and chewing soft substances. True compound eyes rarely present; a group of simple eyes on each side of head in some genera. Abdomen sometimes furnished with rudimentary jointed appendages. This is a relatively unimportant order from the economic stand- point, but is of interest from the fact that it includes the most Fig. 87. Silver fish-moth [Lepisma saccharina). (Enlarged) A household nuisance and a good example of the bristletails. (After Marlatt, United .States Department x)f Agriculture) primitive insects now in existence. The name Aptera is given on account of the entire absence of wings, in consequence of which 73
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