Introductory. 7 



appearance, and both occurring on coffee in association with 

 Scale-bug. 



It is remarkable that in some species of Coccidae, especially 

 such as have in all probability been imported, successive generations 

 of fertile females are produced without the intervention of any 

 male insects. This phenomenon, known as ' Parthenogenesis,' is 

 also found amongst Aphides, and occasionally in a modified form 

 in higher orders of insects. During the ten or more years that 

 the Green-bug {Lecanmni viride) has been with us no male insects 

 have been observed. It cannot be supposed that this state of 

 affairs can go on indefinitely. A generation of males will probably 

 appear in due course, when the more natural mode of propagation 

 will probably be adopted. 



