386 THE COCCIDAE 



where only two groups are found, is that all the mesogenacerores 

 have been lost and that there has been a later reduction in the 

 number of eerores in each lateral group. This must not be taken 

 to imply that tliis is considered as the usual line of reduction 

 followed where the genacerores have been lost. Where there is 

 only a single group of genacerores on each side of the vulva, each 

 group may be known as a latagenaeeroris. The five groups are 

 never fused to form a single, large, inverted, U-shaped mass of 

 pores and only rarely are there more than five groups present. 

 The number of eerores in each group of genacerores is generally not 

 large, the mesogenacerores varying from one to eight, the pre- 

 geacerores from one to forty-two, and the postgenacerores from two 

 to thirty. The most usual number is about two to five mesogena- 

 cerores and less than twelve pregenacerores and postgenacerores. 



The dorsal surface of the cephalic portion of the pygidium is 

 sometimes provided with a series of interlacing thickened lines 

 forming the so-called lattice-shaped thickenings. While the caudal 

 portion of the pygidium on the ventral aspect may be provided 

 with densariae or the dorsal aspect with a few or numerous para- 

 physos which may be comparatively' short or long and slender, the 

 cephalic portion of the dorsal aspect is at times provided with 

 distinct calles or other thickenings. 



Cockerell and Leonardi have proposed and recognized several 

 of the dichotomous subdivisions of the genus Aspidiotus as genera 

 or as subgenera. On the following pages wherever possible, these 

 groups and names have been recognized as of the rank of genera. 

 The unnamed portions of these dichotomies have been recognized 

 as of equivalent rank and named. 



The following species have all been referred to the genus Aspidiotus, 

 but this generic name has been omitted in each species, and, for various 

 reasons, mostly because of the poorness of the description, others be- 

 cause the description was not obtainable, have been omitted from the 

 tables: — alaeodendri Charm., Fiorinia (Aonidia), from Mauritius; alatus 

 Frogg. from New South Wales on Eucalyptus; allaudi Charm., (?Aonidia), 

 from Mauritius; allaudi galliformens Charm., (Aonidia), from Mauritius; 

 bilobis Mask, from Cliina on grass; bossieae Mask, from Australia on 

 Bossiea; caldesii Targ. from Italy, west Australia on Daphne, Acacia; 

 coralinus Frogg., (Targionia), from New South Wales on Eremophila; 

 chamacropsis Sign, from France on Chamaerops; confusus Frogg. from 

 New South Wales on Eucalyptus; dysoxyli Mask, from New Zealand on 

 Dysoxylum; eglandulosus Lindgr. from Guatemala, Panama on Cereus; 

 gidgei Frogg. from New South Wales on Acacia; junctilobius Frogg. 

 from New South Wales on Exocarpus; kennedyae Bdv. from Australia 

 on Kennedya; metrosiderl Mask., Mytilaspis (Anoplaspis), type of 



