E. E. Green 273 



Some interestinfi' observations on the host-affinities of Coccidae may 

 be gathered from these Hsts. It will be noticed, for instance, that the 

 Gramineae (including the Bamboos) have a special Coccid fauna 

 comprising such genera as Antonina, Aclerda, Eriopeltis, Lecano'psis 

 and Odonaspis. The Coxiferae have a monopoly of the genus 

 PhysoJcermes and support twelve out of the eighteen named species 

 of Leucaspis. The genus Kermes is dependent upon species of Oak; 

 while most of the gall- making Coccidae — including the genera Opis- 

 thoscelis, Ascelis and Apiomorpha — occur only upon various species of 

 Eiicali/ptns. 



The grasses can probably claim to support the largest number of 

 species, with the total of 243, out of which number 63 must be credited 

 to the Bamboos. Of individual genera, Eucalyptus heads the list, with 

 133 separate species ; but is run very close by Acacia with 130 and Quercus 

 with 124. If the Acacias and Mimosas were to be counted together, they 

 would take the first place with a sum total of 149. The only other genus 

 that exceeds the century is Ficus, with 102 ; though it is closely approach- 

 ed by Citrus, with 99. After these, the figures drop very steeply, Pyrus 

 coming next with 59 species to its credit, followed by Vitis with 54, Thea 

 and Pinus with 52 apiece, and Cocos with 48. The rest tail off very 

 rapidly. 



It would be interesting to ascertain the species of Coccidae that have 

 the largest number of host-plants, but this would entail more labour than 

 I should care to expend upon the work. I think, however, that Pseudo- 

 coccus citri, Lecanium hesperidum, Lepidosaphes ulmi and Aspidiotus 

 hederae would come somewhere near the top of the fist. 



