Notes 399 



able to see earlier. In it he speaks of the results obtained by Certes 

 who found that various infusoria, flagellates, and amoebae could be 

 revived after five or six years only from the sediments on which he 

 worked, whilst only Colyoda remained capable of revival after thirteen 



years of storage. 



A reference is also given to a paper by Faure-Fremieti on a ciliate 

 Mycterothrix. On looking this up I find that it records that Balbiani 

 working with desiccated material containing cysts of Mycterothrix 

 was able to revive the organisms by moistening after keeping the material 

 dry for four years. 



T. GOODEY, M.Sc, Protozoologist, Research Laboratory for 

 Agricultural Zoology, Birmingham University. 



NOTES ON A SCALE INSECT ATTACKING CACAO 

 IN UGANDA. 



In 1909 a scale insect attacking cacao appeared in the Botanic 

 Gardens. Specimens of this new pest were submitted for identification 

 to Prof. Newstead, who described it as a new species, Stictococcus 



dimorphus Newst.^. 



The other food plants on which it has been collected by the writer 

 are mulberry, Markhamia platycalyx, ornamental Hibiscus, Anona 

 muricata, Croton tigliurn, guava and Cajanus indicus. With the excep- 

 tion of M. platycalyx, all of these plants have been introduced, which, 

 together with the fact that this Coccid has been found in the depths 

 of a forest of something like 180 square miles on M. platycalyx, is 

 conclusive evidence that it is indigenous and that it spread from that 

 plant to the others. 



From my observations cacao appears to be the favourite food 

 plant. When the varieties of cacao, foresteiro and creolle, are grown 

 side by side, the infestation on the former is invariably the most serious. 

 The infestation on cacao is always restricted to the pods and stems 

 of the pods, never having been found on the f oUage or branches. (Fig. 1 . ) 



1 "Le Mycterothrix tuamotuensis (Trichorhynchus tuamotuensis) Balbiani." (Arch. 



f. Protist. XX, p. 223, 1910.) ,„,^^ n / 



2 Newstead, Bulletin Entomological Research, vol. i, p. 63, f. 2 (1010): Green, I.e., 



p. 201 (1910). 



