' THE CA^TADIAN ENTOMOLOGIST 239 



dark, broadly expanded, spinose, with a few hairs. A small papilla 

 between the cornicles and cauda. Hind tibiae with rather long 

 hairs. 



Length .8 to 1 mm. 



Male. — Alate. Head and thorax black, shiny. Abdomen 

 black and dull green,* and with dusky lateral spots; dark at the 

 apex. Antennae black, variable in length, not quite as long, to a- 

 little longer than the body; 1st segment larger than 2nd; 3rd not 

 quite as long as the 6th; base pale, with 17-20 sensoria over its 

 whole length; 4th about as long as the 5th, thick, with 14-18 

 sensoria; 5th with 5-12 sensoria; basal area of 6th small. Proboscis 

 dark, reaching the 2nd pair of legs, acuminate, apical segment 

 longer than penultimate. Cornicles black, flared at apex, con- 

 stricted at base and apex, imbricated. Legs with dark coxae; 

 fore femora green, except at apex, mid and hind dark brown; 

 tibiae green, with dark apices; tarsi dark. Cauda black. Anal 

 black; the cauda with two pairs of lateral hairs and spinose; penis 

 yellow. Wings with brown veins and yellowish-green insertions. 



Length 1 to 1.5 mm. 



Distribution: 



Europe generally; America; Africa? 



Food Plants: 



Pyrus mains, Pyrus communis, Cratcegus sp., Avena sativa, 

 Avena orientalis and Avena fatua; Hordeum hexastichon** and 

 Hordeum distichon, Tritiviim sativum and various GraminecB spp.? 

 Walker gives Cydonia vulgaris, Sorhus aucuparia, Mespilus ger- 

 manicus and Cratcegus oxyacanthce. Oestlund records it on Wild 

 Crab Apple and Mountain Ash. 



Davis, in his recent paper (Bull. 122, U. S. Dept. Agri., 1914), 

 gives the following food plants: Gramineae — Wheat {Triticum 

 vidgare and T. dicoccum^); Oat {Avena sativa). Wild Oat (A . fatua) ; 



*Sanderson says light yellowish brown. 



**The usual name for Barley is Hordeum vidgare, but the cultivated forms are 



grouped into three races: 6-rowed Barley {Hordeum sativum hexaslichon) ; 



4-rcwed Barley {Hordeum sativum vulgare), and 2-rowed Barley {Hordeum 



sativum distichon). Avena sativa is the Common Oat; Avena fatua, the 



Wild Oat; Avena orientalis, the Tartarian Oat. 

 jThe latter is recorded by Mordwilk as hosts of Aphis padi, Kalt. — avence, Fabr. 



This is not the Aphis padi, Reaum. 



