ECONOMIC RELATIONS OF OUR BIRDS. 
469 
Fia. 105. 
TYPES OF THE PRINCIPAL GROUPS OF BENEFICIAL AND 
DETRIMENTAL ANIMALS PREYED UPON BY BIRDS. 
{^Benejicial.') 
Those sucking the blood of detriment il in. 
&ects;—Reduvian and some Corisiaii Bugs, 
HEMIPTERA. 
(Detrimental ) 
Ttiose sucking the juice of useful plants; . 
Harvest-Flies, Leaf-Hoppers, PJant-Lice. 
SPINED SOLDIER-BUG. EGG AND LARVE. 
PLANT DOUSE. SQUASH BUG, 
l!fETJROPTERA. ^Beneficial:) 
Those preying upon detrimental Insects;—' 
Dragon-Flies, Lace-Wings, and Ant-Lions. 
LACE-WIKC FLY, LARVE. COCOON EGGS. 
ORTHOPTERA. {Detrimental:) 
Those feeding on useful plantsGrasshop¬ 
pers Locusts, Crickets, Cockroaches. 
grasshopper. LARVE AND EG® 
Family TURDIDJE: Thrushes. 
Fig. lOG. 
Common Robin {Turdus migratarius). From Baird, Ridgway and Brewer. 
