INSECTS INJURIOUS TO CITRUS GROVES. 



515 



eyes of embryo conspicuous through the shell as it ap- 

 proaches maturity. 



Egg-laying begins with 

 in eighteen to thirty hours 

 after the adults issue 

 when the weather is warm 

 (sixty-five to seventy-five 

 degrees), but with damp, 

 cool weather several days 

 may elapse before they are 

 deposited. Egg deposition 

 occurs upon the under 

 surface of the leaves, pre- 

 ferably upon new ones 

 especially those of water 

 sprouts, but old leaves 

 may also be well covered 

 with them ; they are usual- 

 ly scattered over the sur- 

 face of the leaf without 

 much order of arrange- 

 ment, but sometimes are 

 laid in the arc of a circle. 

 From four to ten eggs may 

 be observed in such an arc 

 and are so placed by the 

 female, using her beak as 

 photo b>j Dorsey. & pivot around which the 



,. F .^M 18 -p white }y (Aieyrodes body is swung during the 



citri Riley & Howard). Pupa cases 



above, mature flies in the middle oviposition 



(slightly enlarged), mature flies 



and eggs below (much enlarged). By mathematical COm- 



putation a leaf from young orange, five inches long and two 

 and one-half inches wide in the middle, collected at Myers, 



