304 THE COCCIDAE 



of lobes as is usual are located between and project between the 

 lobes as rigid extensions or like plates. 



The parts of the pygidial fringe that in this tribe occur 

 with only rare exception are beginning at the meson arranged 

 in the following oi-der. There is a well marked median incisura 

 sometimes containing one or two latadentes, usually without 

 plates, and bounded on each side by a median lobe. The second 

 incisura cephalad of each median lobe contains a latadentis and 

 one or two j)lates. Tiiis incisura is limited by a second lobe. 

 The third incisura also contains a latadentis and one or two 

 plates and is limited by a third lobe. The fourth pair of lobes 

 may be present but is only rarely so and the area cephalad of 

 the third lobe belongs to a lateris and usually bears four groups 

 of plates, the groups usually separated by latadentes. The fourth 

 or cephalic group generally contains more plates than the others. 



The genera and species of this tribe are difficult to separate. 

 Many of the structures available in the other tribes for separat- 

 ing genera and species are not available here. Some writers 

 have not always been careful to differentiate the characters present 

 so that it is sometimes difficult to decide whether a given species 

 has lobes, plates, or what is more likely latadentes bearing ora- 

 ceratubae. 



The following species have been omitted from the tables, either be- 

 cause the description was not available or because it was not possible 

 to place the species: — Chionaspis bambusae Ckll. from Japan on bam- 

 boo; depressa Zehnt. from E. Java on Saccharum; myrthi Bouche from 

 France on Myrtus; natalensis Mask, from Natal on grass; nitida 

 Mask, from Australia on Daviesia; planchonii Sign, from southern 

 Europe on Quercus; rosae Goethe from Germany; sacchari-folii Zehnt. 

 from Java on sugar cane; tegalensis Zehnt. from Java, Mauritius; 

 Diaspis blankenhorni Targ from Italy; celtidis Ckll. from Texas on 

 Celtis; chilensis Ckll. from Chili; colvei Penzig from Italy; cordiae 

 Rubs, from Brazil on Cordia; euphoriae Charm, from Mauritius on 

 Nephelium; minima Targ. from Europe on arbor-vitae; monserati Colv. 

 from Spain on Corynocarpus(?) ; olea Colvee from Spain on olive; 

 sen tali Mask from New Zealand on Santalum, pear, plum; squamosus 

 Newst. & Theobald from Egypt on peach, pear; taxicola Vays. from Al- 

 geria on Taxus; trinacis Colvee from Spain on Trinax, Strelitzia; vici 

 Schr. from Europe on mistletoe; Aspidiotus (Diaspis) vitiensis Mask. 

 (Leon.) from Fiji; Epidiaspis subterranea Lindgr. from France on grass, 

 evidently an aspidiotid; Poliaspis casuarinae Lidg. from Australia on 

 Casuarina; Pseudoparlatoria ostreata Ckll. from Jamaica on Acalypha. 

 The tables offered for separating the genera and species should be used 

 with care and wherever possible specimens should be compared with th^ 

 original descriptions and figures. 



