THE CITRUS MEALY BUG 



297 



The color of the body is light yellow, turning darker in the more ad- 

 vanced egg-laying forms. When boiled in KOH the body contents first become 

 cardinal and finally change to an amber or yellow color. When the contents 

 have been removed the appendages and body wall become perfectly trans- 

 i;arent and colorless after they have been cleared in clove oil or in xylol. 



Figure Hi. Adult females of Pseudococcus citii. 

 (Pom. Journ. Eiit. Vol. I, \n. i. Fig. :V2.) 



Antennae (Fig. 115 A). While the articles of the antennje vary to a 

 marked degree, yet much use can be made of them in determining the species. 

 From careful microscopic measurements the following formulae were derived : 

 8, 3, (2. 1. 7) (4. 6. 5) and 8. 3, 2 (1. 7) (4, 6. 5 ). In Insect Life. Vol. 

 vii, No. 2, p. 172 (1894), ^Ir. G. C. Davis ofl^ers the following in regard 

 to the antennal articles: "In destructor the basal and terminal segments are 

 of equal width and broader than the others. The terminal segments are not 

 nearly truncate. The following shows the length of the different segments 

 beginning at the Ijasc. The measurements are made by using the micrometer; 

 1_3.5, 2—5. 3—5, 4—3, 5—4.25, 6—3.25, 7 — 1-.5. 8— lO." 



From these measurements the following formula ma\- be derived : 8, 

 (2, 3), 7, 5, 1, 6, 4. 



