28 MISC. PUB. 601, U. S. DEPT. OF AGRICULTURE 



is the generic name, domestica is the specific name, and the fly was 

 first named by Linnaeus. 



Synopses of the major orders of insects are given in the sections 

 that follow. For more detailed information on classification, one or 

 more books such as those following should be consulted : 



college entomology. E. O. Essig. 900 pp., illus. 1942. New York. 

 field book of insects. F. E. Lutz. 509 pp., illus. 1918. New York. 

 how to know the insects. H. E. Jaques. Iowa Acad. Sci. Biol. Survey Pub. 

 1, 140 pp., illus. 1936. St. Louis, Chicago [etc.]. 



AN INTRODUCTION TO ENTOMOLOGY. J. H. COMSTOCK. 234 pp., illUS. 1888. 



Ithaca, N. Y. (Completely rewritten 1920.) 



THYSANURA 



Thysanura (silverfish, bristletails) are wingless insects with long 

 antennae and usually with three long taillike appendages. The mouth 

 parts are formed for chewing. The young resemble the adults. (See 

 fig. 16.) They are usually found in moist situations around houses 

 or out of doors under stones and boards. They are flat and can run 

 rapidly and hide in cracks and crevices. Occasionally they do some 

 damage to bookbindings and curtains. 



COLLEMBOLA 



Collembola (springtails) are tiny wingless insects which jump by 

 means of a taillike appendage that folds under the body. The mouth 

 parts are formed for chewing. The young resemble the adults. 

 Springtails are common in moist situations and in leafmold. Some 

 species are important pests in greenhouses and mushroom cellars. 



ORTHOPTERA 



Orthoptera (grasshoppers, crickets, katydids, roaches, mantids, 

 walkingsticks, earwigs) generally have two pairs of wings which have 

 many veins ; the front pair are usually slender and the hind pair broad 



Figure 17. — Orthoptera. German cockroach (Blattella germanica (L.)), the com- 

 mon cockroach usually found in houses in cities. Actual length about 16 mm. 



