HOW TO KNOW THE IMMATURE INSECTS 



6a. Tarsi with but 1 claw and 1 segment. 

 Fig. 380 



FamUy COCCIDAE 



Fig. 380. A, the scale, Mvtilospis citricola Packard: a, 

 mature stage with eggs; b, newly hatched nymph; c, 

 same with waxy secretion; d & e, intermediate stages. 

 B, Walkeriana ovilla Green, 1st instar. C, Florida wax 

 scale, Ceroplbstes floridensis Comstock, different stages. 



The members of 

 this family ore scale- 

 insects, mealy-bugs 

 and others. They 

 live on the stems, 

 leaves, roots and 

 are the most serious 

 pests of horticultur- 

 ists. However, there 

 are some useful spe- 

 cies: shellac is pre- 

 pared from the lac- 

 insects, Lacciiei lac- 

 ca Kerr in India. 

 The wax is produc- 

 ed by Eiicerus pe-la 

 Chavannes in Chi- 

 na; and the cochi- 

 neal is composed of 

 dried bodies of Coc- 

 cus cacfi L. 



6b. Tarsi with 2 clows and 2-segmented 7 



7a. Hind legs fitted for leaping. Fig. 381 Family CHERMIDAE 



The members of this family have the ability 

 to jiunp and are called jumping plant lice. They 

 are plant feeders and often occur in large nimi- 

 bers. All of them secrete honey dew and a few 

 produce galls on the leaves. 



The nymphs are flat and possess large wing 

 pads and often have a marginal fringe surroimd- 

 ing the abdomen. Some are covered with a 

 waxy secretion. 



Fig. 381. Pear psyl- 

 ia. Psyda pyricola 

 Foerst. 



138 



