Introductory. 319 



Specific names may be placed in three categories ac- 

 cording to the manner of publication: 



(1.) Nomina nuda. Names published wholly without 

 description. These are entirel^^ ignored in the present 

 list. 



(2.) Nomina seminuda. Names published with descrip- 

 tive matter insufficient for the determination of the 

 species. These are included, but numbered separately 

 from the rest. The length of a description is not a proper 

 test in this connection, as a very short account may 

 be ample to identify a well-marked species, while some 

 quite long descriptions are inadequate. 



(3.) Nomina valida. Names published with descrip- 

 tions sufficient for the recognition of the species. These 

 are numbered consecutively. 



S. means synonym, v., variety or mutation. 



Many names proposed by Green, W. G. Johnson, Olliff, 

 and the present writer have been included, though un- 

 published at the time of writing; but in every case the 

 description is understood to have been prepared, and to 

 be awaiting very earlj^ publication. For the reference of 

 Ortonia natalensis to Icerya I am indebted to Mr. L. O. 

 Howard, who has examined specimens. The use of the 

 name n^itis for Margarodes vitium seems to be demanded 

 by strict priority, though it is only adopted with ex- 

 treme reluctance. Tetrura is referred to OudaUis, as it 

 seems to be pi'actically identical with it. Asterolecanium 

 oncidii is restored, as I have received from Trinidad 

 (Hart) a different species, which I believe to be the real 

 A. aurewn. In Lecanimn I have separated the section 

 Eulecanium; but among the tropical forms I have not 

 even distinguished Bernardia or Saissetia, {L. olea>, ike), 

 because the very large number of new species lately dis- 

 covered necessitates a thorough revision of the groups, 

 with more prolonged study than is possible for me at 

 the present. I am not familiar with Aspidiotus sahalis, 



