PHYLUM ARTHROPOD A 



343 



and flowers, but are not of any economic importance in this 

 country. 



Order 10. Orthoptera. COCKROACHES, WALKING-STICKS, 

 MANTIDS, GRASSHOPPERS, LOCUSTS, KATYDIDS, AND CRICKETS 

 (Figs. 269-274). --Insects with four 

 wings ; the fore- wings leathery ; the 

 hind wings folded like a fan; biting 

 mouth-parts ; metamorphosis incom- 

 plete. 



The principal families of ORTHOP- 

 TERA are as follows : 



(1) BLATTID.E (COCKROACHES, Fig. 

 269). These insects have legs fitted 

 for running. The common American 

 species are the " croton-bug " (Ectobia 

 germanica) which was introduced from 

 Germany, and the " black-beetle " 

 (Periplaneta oriental-is, Fig. 269) from 

 Asia. 



(2) MANTIDS (PRAYING-MANTIS, 



Fig. 270). The fore legs of these insects are fitted for grasping. 

 Their food consists largely of other insects. 



(3) PHASMID^: (WALKING-STICKS, Fig. 271). The legs of 

 the phasmides are adapted for walking. Walking-sticks feed 

 on foliage and are difficult to distinguish from twigs, hence their 

 name. 



FIG. z6g. Order ORTHOP- 

 TERA. Cockroach, Periplaneta 

 orientalis. (From Sedgwick's 

 Zoology.) 



FIG. 270. Order ORTHOPTERA. Praying-mantis, Phasmomantis Carolina. 

 (From Davenport, after Packard.) 



