1900] 



CUERANT GALL MITE. 



43 



still need more information as to the life-habits of this Wheat-bulb 

 Fly before being able to suggest any presumably successful means of 

 prevention and remedy. 



We do not yet know whether the fly is double-brooded ; that is, 

 whether the brood that we know hatches from the chrysalids from 

 about May to July lay eggs on grasses or somewhere (at present un- 

 known), from which may arise, in due course, flies laying the eggs to 

 produce the winter grubs. 



The remarkable and at present unexplained part of the attack is 

 the fact of its, for the most part, having been observed as following on 

 fallow or exposed land. Details of circumstances of attack are given 

 in various of my Annual Reports referred to, and if any observers 

 could assist us with further information as to life-history, or means of 

 prevention of the pest, it would be a valuable service to all Wheat 

 growers. 



CUERANT. 



Currant Gall Mite. Phytoptus ribis, Nalepa. 



Phytoptus ribis. — 1, mite, greatly magnified — natural length of female 0"23 

 millimetres ; 2, head and fore parts, still more magnified ; (by permission, after 

 Dr. A. Nalepa). 3, mite-galls of unusually large size, with one withered and open. 



