240 THE CANADIAN ENTOM.OLOGIST 



Tall Oat Grass {Arrhenatherum elatius); Barley {Ilordeum vulgare); 

 Two-rowed Barley (//. distichon); Wall Barley {Plileum pratense); 

 Canada Blue Grass iPoa compressa); Kentucky Blue Grass {Poa 

 pra(e)isis); Annual Meadow Grass {Poa annua); Crab Grass 

 {Syntherisma sanguinale) ; Upright Chess {Bromits racemosus) ; 

 Rescue Grass [Bromus unioloides); Cheat (Bromus secalinus); 

 Hungarian Brome Grass {Bromus inermis); Orchard Grass 

 {Dactylis glomerata); Italian Rye Grass {Lolium multiflorum); 

 Perennial Rye Grass {Lolium perenne); Red Top {Agrostis alba); 

 Red Fescue {Festuca rubra); Sheep's Fescue {F. ovina) ; MQ^.do\\ 

 Fescue {F. pratensis); Hard Fescue {F. ovina duriuscula); Reed 

 Canary Grass {Phalaris arundinacea) ; Melic Grass {Melica 

 banhini and M. penicillaris); Johnson Grass {Andropogon hale- 

 pensis); Broom Corn {Andropogon sorghum, var.); Koeler's Grass 

 {Koeleria cristata) ; Wild Rye {Elymus genicidatus) ; Virginia Wild 

 Rye {Elymus virginicus); Nodding Wild Rye {E. canadensis); Corn 

 {Zea mays); Teosinte {Euchlana mexicana); Typhaceic: Cat-tail 

 {Typha laiifolia); Amniiacea^: Celery {Apium graveolens); Compo- 

 sita?: Tick Seed {Coreopsis sp.); Malaceie: Apple {Mains mains); 

 Pear {Pyrus communis); Hawthorn {Crataegus coccinca, etc.); 

 American Mountain Ash {Sorbtis americana); Quince (Cydonia 

 vidgaris); Wild Crab Apple {Mains sp.); Rosacea*: Ninebark 

 {Opulaster opulifoliiis); Amygdalacea.-: Plum {Primus sp.); Choke 

 Cherry {Padus virginiana) and Wild Black Cherry {Padus padus 

 and P. serotina) ; Pergande also gi\'es Cornus sp.. Bursa bursa- 

 pastoris, Arctium minus, all probably accidental hosts. 



I have never found it on Padus, and it certainly is not the 

 Aphis padi of Reaumur. 



Life-history: 



Fabricius originally described this species from specimens 

 found on Oats {AveJia saliva). Kaltenbach on Avena fatua and 

 saliva and on Ilordeum hexastichon and distichon. Thomas (Third 

 Rept., p. 53, 1879) refers to avence as appearing on the fall wheat 

 and oats in America, working upon the leaves and stalks singly, 

 and that when winter appears that they move down to the ground, 

 some at least entering the soil, and. feed upon the sap of the roots, 

 and at the same time he found an alate individual on the blade. 



