205 



The nature of the soil itself also affects the question. Its chemical 

 composition may be a controlling factor, as the character of the nutri- 

 ment afforded to the insect by the tea-plant depends on the potash- 

 phosphoric aqid ratio. 



Manuring experiments showed that potash is beneficial, but the 

 results obtained were very irregular. Evidently factors preventing 

 the bush from utilising the potash present in the soil also prevent it, 

 to some extent, from deriving benefit from the potash manures added 

 to it. 



To eUminate this, direct injection of the bushes with potash was 

 tried and was convincingly successful. Bushes that were heavily 

 infested with Helopeltis quickly became free from the pest and gave 

 .splendid flushes. Insects alighted on the treated bushes, but did no 

 damage, gave up their attempts to feed and migrated to untreated 

 bushes. 



The author considers that it will therefore be possible in the near 

 future to control this pest, though all the factors that afiect the question 

 have not yet been discovered. Proper attention to subsoil drainage 

 is especially recommended. 



Green (E. E.). Notes on Indian Coccidae of the Subfamily Diaspid- 



inae, with Descriptions of new Species. — Records Indian Mus., 



Calcutta, xvi, pt. vii, December 1919, pp. 433-449, 6 plates, 



[Received 17th March 1920.] 



To the Indian list of scale-insects fifty species are added, the following 



'})emg described as new : — Chionaspis annandalei on Dendrocalamus 



-strictus ; C. caroli on tea plants ; C. chir on chir pine {Pinus sp.) ; 



C. (Phenacaspis) gudalura and C. spiculata on bamboo {Bamhusa) ; 



Aspidiotus {Hemiberlesia) pseud ocamelliae on (Japparis stylosa ; 



A, tamarindi on Tamarind us ; Aonidia indica on an undetermined 



plant ; A. tentaculata on Vateria indica ; Gymnaspis ficus on Ficub 



refusa ; G. ramakrishnae on Hemigyrosa ; Parlatoria artocarpi on jak 



(Artocarpus ititegrifolia) ; P. {WebsterieUa) papillosa on jak ; P. vateriae 



on Vateria indica ; Lepidosaphes meliae on Melia azedarach ; L. retrusus 



on Litsea ivhiteana ; Fiorinia frontecontracta on Garcinia indica ; 



F. plana, on Elaeodendron glaucum ; F. sapiindi on Sapindus trifoliatus. 



Oreen (E. E.). On a New Genus and Species of Coccidae from North 

 Western India and Eastern Persia. — Records Indian Mus., Calcutta, 

 xviii, Pt. 2, December 1919, pp. 117-119, 2 plates. [Received 

 17th March 1920.] 



Naiacoccus serpentinus, gen. et sp. n., on Tamarix orticulata in 

 India and N. serpentinus var. minor on T. stricta in Eastern Persia 

 *re described. 



Special Entomological and Mycological Investigation and Work 

 Connected with Insect and Fungus Pests and their Control. 



Rept. Dept. Agric. St. Vincent, 1918-1919; Barbados, 1920, 

 pp, 13-18. [Received 15th March 1920.] 



A study of infestation of cotton fields by the cotton-stainer, Bysdcrcus 

 delauneyi, Leth., indicates that the insects come, not from the forests 

 as has been suggested, but chiefly from the vicinity of buildings on 



