CLASS insecta: oedee hemipteea. 219 



Mg. 375. 



Ih/tlscuefaseivemtris, Water-beetle and Larva of Water-beetle. " Water-tiger." 



crawl upon the land, construct a round cell, and come forth 

 as beetles. 



ORDER HEMIPTERA. 



G-eneral Characteristics. — The Hemipters (half-winged) 

 have fore wings half leathery and half membranous ; usually 

 both ocelli and compound eyes ; and a suctorial mouth. The 

 metamorphosis is incomplete. 



Cicadidse. — The Harvest-fly family includes the " Seven- 

 teen-year Locusts." * The females, with a saw-like oviposi- 

 tor, furrow the twigs of both forest and orchard trees longi- 

 tudinally to the length of fifteen or eighteen inches, piercing 

 every two-thirds of an inch to the pith, and' depositing two 



* They appear in different localities annually, but in any one only once in eeven- 

 teen years. C. V. Eiley states that there is a " Thirteen-year Locust." 



