1921] Uichanco — Reproduction in the AphididcB 



99 



South Africa Myzus persicce Sulz. 



Sudan Aphis sorghi Theob. 



Sudan, Anglo-Egyptian 



Aphis sorghi Theob. 

 United States: — 

 California 



Moore (1912) 

 Vuillet (1914) 



Theobald (1904) 



Florida 

 Indiana^ 

 Texas 

 Virginia^ 

 South Carolina 



Aphis avence Fabr. Ewing (1916) 



Macrosiphum rosce Eeam. Russell (1914) 

 Aphis hrassicce L. Quaintance 



(Herrick, 1911) 

 Macrosiph a m grana riu m 



Kirby Phillips (1916) 



Aphis pseudohrassicce 



Davis Paddock (1915) 



Macrosiphum granarium 



Kirby Phillips (1916) 



Callipterus trifolii 



Monell Davis (1914) 



Southern U. S.* Toxoptera graminum Eond. 



Webster and Phillips (1912) 

 Washington Pemphigus beta' Doane Doane (1900) 



Supplementary to the above data may be cited here the other 

 paper of van der Goot (1917, p. 2), who, after three years of bio- 

 logical and taxonomie work on the Aphididse in Java, reported that 

 he had never found amphigonous individuals in that country — 

 not even at high mountain elevations where the temperature falls 

 to the freezing point at night. Likewise, several years of casual 

 observation and collecting in the Philippine Islands by me failed 

 to disclose the male and oviparous-female forms. So far as I am 

 aware, the occurrence of amphigonous aphid individuals in any 

 other tropical country has not been definitely reported. It should 

 be borne in mind, however, that failure to discover such forms in a 

 given locality does not prove their non-existence there; although, 

 when workers carrying on investigation for years in tropical re- 

 gions report their inability to find amphigonous forms in any 

 season of the year, there is some ground for suspicion that partheno- 



' Amphigonous individuals and winter eggs of that species also found m 

 this locality. 

 * South of the 35th parallel. 



