Hemiptera 



197 



▼oraciously at the juices of plants, their jaws being well-developed. 

 The females pass through no resting stage, but the males are quite 

 passive before their last moult, closely approaching to the true 

 pupa of the higher insects (fig. 76^ (124). 



Fig. no. — Scale Insect {ifytiiaspis pomarum, Bonche.) Europe, a. male; c. 

 nymph ; e. female, magnified 20 times ; b. foot ; d. feeler, more highly 

 magnified. From Howard. Yearbook, U.S.. \. Dept. Agr., 1394. (See also 

 fig. 170). 



ORDER 8.— PLECTOPTERA. 



Structure. — The Mayflies, which comprise this 

 Order, are delicate insects of very remarkable structure. 

 The head is relatively large, with a pair of short 

 slender feelers of two or three segments ; the jaws 

 are vestigial, as Mayflies take no food in the perfect 



