418 



Caesar (L). Notes on Leaf Bugs (Miridae) attacking Fruit Trees in 



Ontario. — 51st Ann. Rept. Ent. Soc. Ontario, 1920, Toronto, 

 1921, pp. 14-16. [Received 15th June 1922.] 



The Capsid bugs occurring in Ontario include Heterocordyhis 

 malinus, Lygidea mendax, Neurocolpiis niibilus, Paracalocoris colon, 

 Campvlomma verbasci, Lygus communis and L. qnercalbae. 



The majority of these, including L. communis, occur on apple and 

 pear, though a large percentage of the apples appear to outgrow the 

 injury from it. L. qiiercalbae caused serious damage to peaches in 

 one case ; it apparently bred on white oak trees in the neighbourhood 

 of the orchard, and it is thought possible that it also breeds on red oak. 

 L. caryae has been reported as injuring peaches in New York. 



Camptohrochis borealis was generally present to about the same extent 

 as L. communis, but it has not yet been proved whether it feeds on 

 apples. It has been recorded as feeding on Aphids, and when they 

 are not present it will subsist on sap from apple trees. 



MiTCHENER (A. v.). The Manitoba Grasshopper Campaign of 1920. 



— 51st Ann. Rept. Ent. Soc. Ontario, 1920, Toronto, 1921, 

 pp. 16-19. [Received 15th June 1922.] 



The chief species causing injury in Manitoba are Camnida pellncida, 

 Mclanopliis atlantis, M. femur-rubrum and M. bivittatus. During the 

 campaign of 1920, a special machine for mixing bait was devised 

 [R.A.E., A, ix, 259]. The poisoning operations lasted from the end 

 ■of May to 23rd July. An average of 1,035 dead grasshoppers was 

 counted to the square yard. It is estimated that every pound spent 

 on baits saved crops to the value of £110. 



Criddle (N.). Some Phases of the present Locust Outbreak in 



Manitoba. — 51st Ann. Rept. Ent. Soc. Ontario, 1920, Toronto, 

 1921, pp. 19-23. [Received 15th June 1922.] 



The egg-laying habits of Mclanopliis atlantis and Camniila pellucida 

 (roadside locust) are compared [R.A.E., A, ix, 126]. 



Many factors are involved in their natural control ; dryness favours 

 their increase, but eggs exposed to the sun in April and May were 

 nearly all destroyed ; cold has apparently no effect on them. Contrary 

 to expectations, Sarcophaga kellyi, being less abundant in 1920 than 

 in 1919, did not prove of great importance in their control. The 

 fungous disease, Empiisa grylli, occurred in restricted areas. Mites 

 {Trombidium sp.), though occurring in abundance on M. atlantis, do 

 not seem to produce much effect on the adults, though they destroy 

 a large number of the eggs. C. pellucida in all stages escaped almost 

 entirely. The chief enemies of the locusts are blister beetles and the 

 Syrphid, Systoechus vulgaris. During 1920, Microbasis unicolor var. 

 murina and Cantharis sphaericollis were the more important blister 

 beetles ; the former is a pest of the plants of the pea family and 

 potato, while the latter feeds on prairie snowberry {Symphoricarpus 

 occidentalis) and cultivated honeysuckle ; others recorded were Epicauta 

 sericans feeding on Anemone and lambsquarters [Chenopodium], and 

 Cantharis niittalli feeding on members of the pea family and Caragana. 

 The larvae of these beetles apparently destroy the locust eggs. A 

 Hymenopterous parasite reared from the eggs is probably that described 

 as Scelio luggeri, Riley, which emerges just about the time the locusts 

 are ovipositing. 



