134 



ECONOMIC ENTOMOLOGY 



Orthezia and Hemichionaspis in addition to the Mealy Bugs already 

 described. 



Soft Brown Scale {Coccus hesperidum Linn.). — An oval, flat scale, 

 straw colored to dark brown; viviparous. Occurs on oleander, Cycas, 

 ivy, rubber plant, box elder. 



Hemispherical Scale {Saissetia hemisphcerica Targ.). — An oval, 

 polished, rich brown scale; oviparous. Occurs on palms, orchids, ferns, 

 asparagus, oleanders (Figs. 82 andj83). 



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Fig. 86. — Types of antennae of aphids: a, Chailophorus; b. Aphis; c, Schizoneura; 

 d, Pemphigus (apterous); e, Chermes; f, g, sensoria. 



Oleander or Ivy Scale {Aspidiotus hederce Vail.). — A circular, flat, 

 grey or white scale, with a pale orange-colored centre. Occurs on 

 oleander, ivy, box wood, orange, palm, cycad. 



Circular Scale (Chrysomphalus aonidum Linn.). — A circular dark 

 brown scale with a grey nipple in a reddish brown ring. Occurs on 

 Araucaria, citrus, oleander, begonia, and rubber plant. 



