GBAIN INSECTS. 125 



Hydrellia griseola Fallen. 

 (Grain Leaf Miner. Ephydridae; Diptera.) 



Hosts: Barley, oats, grasses. 



Injury: Mines the leaves. 



Description and biology: Adult fly metallic brown, thickly dusted with gray; under- 

 sides and palpi yellow; antennae black, face and beak brown; 2.75 mm, long. Larva 

 2 mm. long. 



Distribution: Europe. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, pp. 408, 409, 



fig. 254. 



Camarota flavitarsis Meigen. 



(Grain Fly. Oscinidae; Diptera.) 



Hosts: Wheat, grasses. 



Injury: Bores in stems. 



Description and biology: Fly, blue black, undersides white, length 2.5 mm. Larva 

 and pupa with two large stigmal hooks at apex. 



Distribution: France. 

 SoRAUER, p. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, pp. 412, 413. 



Chlorops .taeniopus Meigen. 

 (Straw Fly. Oscinidae; Diptera.) 



Hosts: Wheat, rye, barley, grasses. 



Injury: Bores in the stems of grains. 



Description and biology: Fly, yellow, with three black lines on thorax, four black 

 cross bands on abdomen and black antennae; length, 3-^ mm. Maggot, yellowish 

 white, 5-7 mm. long. Winters in stem near roots. 



Distribution: Europe. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, pp. 412, 413. 



>KOscinis frit Linnaeus (Oscinls pusilla Meigen). 



(Frit FUes. Oscinidae; Diptera.) 



Hosts: Oats, barley, wheat, rye. 



Injury: Mines the stems of grains. Serious pests. 



Description and Biology: Adult fly, shining black, metallic. Larva, white, legless. 

 Mines the stems and roots. 



Distribution: Etirope, America. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 410, 411, 



B. OTHER IMPORTANT GRAIN INSECTS. 



HEMIPTERA. 

 Lygaeidse. 



Nysius I'initor Bergroth; Australia. (See Fruit.) 



Jassidse. 



Jassus seznotatus Fallen of Germany is a very injurious insect to wheat, barley, oats, and grasses. 

 The eggs might be imported with straw during the winter. This is a bright-yellow leaf hopper with 

 black markings, measuring about 3.75 mm. in length. 



THYSANOPTERA. 



Haplothrips tritici Kurdjmnov, the Europe grain thrips; Europe; often winters in wheat stubbles. 



(See pi. XXIX, fig. d.) 

 Haplothrips aculeata Fabricius (see pi. XXIX, figs. a,b) and Limothrips denticornis Haliday; Europe; 



attack grain. (See pi. XXIX, fig. c.) 



