1917 



ENTOMOLOGICAL SOCIETY. 



45 



e.g., The United States, South Africa and England; however, in Ontario, fortu- 

 nately for everyone concerned, it is only of minor importance. It is present in all 

 our apple growing sections — on orchard and nursery tree, but it is seldom 

 abundant and injurious enough to cause any alarm, or to warrant the- adoption 

 of remedial measures. 



During the summer, colonies of flocculent apterous viviparte occur on the 

 twigs and water sprouts and around pruning wounds on the limbs and trunk. 

 Rarely the lice are also found feeding on the roots of nursery stock, where they 

 cause the formation of knotty enlargements. (Personally, I have never found 

 Ihe root-inliabiting aphides in Ontario. Nurserymen, however, inform me that 

 they occasionally see them.) In September, alatc forms appear and, according 

 to Dr. E. Patch, of Maine, migrate to the American Elm, wdiere they give birth 

 to the sexes — minute wingless creatures. Aker mating, the females lay their eggs 

 in crevices on the bark. Tlie migration back to apple takes place in June of the 

 following year. 



The Clovei{ Aphis (Aphis hakcri Cowan). This plant-louse does not appear 

 to be common in Ontario. Personally, I have only taken it thrice on apple. In 

 Colorado, however, A. hakcri, according to Gillette and Taylor, " ranks -liext to the 

 green apple aphis in numbers as a leaf infesting species of the apple." 



As the name suggests, the clover aphis migrates from apple to clover. 



Ontario collections: Migrants — Arkona, 6.10.16; Migrants and young — 

 Vineland, 14.10.16 and 17.10.16. 



The Long-beaked Cloveii Aphis {Aphis hrevis Sanderson). This insect 

 is essentially a hawthorn species, and it only occasionally occurs on apple. I have 

 made but three collections of it from the latter host. 



Like the preceding species, it spends the summer on clovers. 



Ontario collections: Migrants and males^=— Vineland 3.11.15; Males^-Arkona, 

 6.10.16; Migrants, males and immature oviparae, Vineland 17.10.16. 



Aphis sp. (near gossypii). In June, 1915, Mr. Howard Curran, my assistant, 

 collected specimens of an unfamiliar, pale green aphid from an old apple tree grow- 

 ing on the O.A.C. campus at Guelph. According to Mr. Curran, the plant-louse 

 was quite abundant at the time the collection was made. 



This aphid is either a new species closely allied to Aphis gossypii, or it is & 

 variety of the melon aphis. % It differs from typical A. gossypii in having sensoria 

 on antennal joint IV and sometimes on V, but whether this difference is of specific 

 value I am at present not prepared to say. Only a careful study of the antennal 

 variations of A. gossypii from different hosts will settle this point. 



The following table affords a comparison between Aphis sp. and Aphis gossypii 

 in the matter of antennal sensoria, and it likewise indicates the varialiility of the 

 melon anhis. 



Laboratory 

 No. 



6287.1, 



6287.4 

 6305 . . 



Aphid 



Sensoria Sensoria 

 on III I on IV 



Aphis sp 7-11 



Aphis gossypii as aescribed by Pergande 5-7 



Aphis gossypii from cucumber 5-8 



Aphis gossypii from begonia 6-8 



6294.3 : Aphis gossypii bred on apple ! 7-10 



6405 Aphis gossypii bred on appie 8-11 



3-6 



None 



None 



0-1 



0-2 



0-2 



Sensoria on V 



0-2 and the sub-apical 

 Sub-ap'cal 

 Sub-apical 

 .Sub-apical 

 Sub-apical 

 Sub-apical 



