96 



D. D EMMEREZ DE CHARMOY. 



damage to crops such as it did in Mauritius, at once concluded that it was being kept 

 in check by some natural enemy. Upon Phytalus larvae which he brought back to 

 the British Museum, Mr. Gilbert Arrow detected the presence of the larva of a Scoliid 

 wasp, suspected of being that of Dielis (Campsomeris) dorsata, which Mr. Marshall 

 had observed in fields infested with Phytalus and Ligyrus tumulosus. 



PORT IiOUISn 

 DISTRICT D 

 m 





^ 



P.M. Powders Mills 

 R.O. Roya.1 Observa.tory 

 8.G. Bota.nicaJ Gardens 

 L . Lcuiglois 



•2. 



*« 



vf 



Sketch map in which the spiral black line shows the gradual increase in 

 the distribution of Phytalus smithi during the past five years. 



This fact led them to believe that this Scoliid might be one of the chief parasites 

 that kept the Phytalus in check. It has since been shown, however, by Mr. W. 

 Nowell, then Mycologist to the Local Department of Agriculture, Barbados, in a 

 report published in the Annals of Applied Biology (1915) that the ratio of this para- 

 sitism to that due to Tiphia parallela at the same time and place was calculated to be 



