so HITINC. AND NOXIOI'S INSKCTS (1TIIKIC THAN ^fOSQ^ITOI•:s 



I apiiii iHKitf |lr. Slijirp, wlio smvs: "It is iml kimwii tliat tlic |iiiiiisit«s liav<' aiiv 

 |tii\vcr (if rfiiiaiiiiii^' in alu yaiicf, as tlw locust cf^gs may il". ami tlic Mnl distroycrs of the 

 loi'iist limy j^rcatly <liiiiiiiisli in miiiiiIm is iliiiiiig the yeiir, wlicii tlic insects arc not miiiicrous ; 

 so that a tlisproiiortion of iiuiuIhts l)i'twec'ii the louusts ami tlu-ir destroyers may arise, and 

 for a time the locusts may increase rapidly, while the parasites arc much inferior to them in 

 niiiiihcrs. If there should come a year when very few of the locusts hatch, then the next 

 year tliere will !»■ vny few iiaiasites, ami if thi iv shniiM then be a large hatching of locustB 

 from eggs that have remained in aheyanee, the |iaiasites will not he iircseiit in suflicient 

 fjuantity to keep the destructive insects in check ; conse(|iuiitiy the next year tlii' increase in 

 number of the locusts may be so great as to give rise to a swarm. ' 



Fig. 19.— Ft'Ncus op Wheat Grain 



Fig. 20.— Kl'ngi's of Cotton 



More recently in dead locusts sent from Suakin I have found a fungus which grows as a 

 white culture on agar slope. It may or may not have killed these locusts, but it is proposed 

 to test it next locust season. In locusts from Seiiaar a form of acarus was present. 



Vegetable 

 parasites of 

 plants 



Veoet.aiu.k 1'.\r.\siti:s 



Vegetable parasites of plants have not been mucli in evidence. Some imported wheat 

 grains inten<leil f(ir planting were sent by Major Piclcinson. as they had been attacked by 

 Acari. In the holes formed by the insects I found a very beautiful little fungus of a kind 

 ipiite unknown to me. The tiny sjiear-lieadcd sporangia (Fig. Ifl) arc very delicate, and 

 nothing like them is figured in Tubiief ami Smith's standard work on the subject. On old 

 cotton plants sent from Berber black patches of a mycelial fungus with conidia and 

 coniiliophores were present (Fig. 20). It may be Murrosjioranii uiijricautium Atks. 



