322 ELEMENTARY STUDIES IN INSECT LIFE 



tudinally striped naked insect, about one and a half 

 inches long. Feeds on leaves of maple. Two broods. 



Remedies. Spray with arsenites, early in the sea- 

 son. Insect has several parasites which keep it in 

 check. Many birds prey upon it. 



House Plants. See Plant-Lice, Scale Insects, and Ked 

 Spider. 



HESSIAN FLY. See under Wheat. 



HORN - FLY OF CATTLE. ( Hcematobia serrata E. 

 Desv. ; order Diptera.) A small black fly, about one- 

 sixth of an inch long, tinged with brown and gray. 

 Characteristic habit is to cluster about the base of the 

 horn. 



Preventive. Greasy substances, such as tallow or 

 fish oil, will keep insects away from animals for several 

 days. Spraying the animals with kerosene emulsion. 



JUNE BUG. See May Beetle. 



LEAF-CRUMPLER. (Phycis indiginella Zeller; order 

 Lepidoptera.) Brown larva, found within the folded 

 leaves of the various kinds of plants. 



Remedy. Spray with arsenite before the larvae 

 conceal themselves within the folded leaves. Gather 

 the folded leaves after the larvse have pupated, and 

 burn them. 



Lettuce. APHIS or GREEN -FLY. A plant-louse 



which thrives on lettuce growing under glass. 



Preventive. - Tobacco-dust thrown on leaves of plants 

 when aphis first appears. A better method is to fumi- 

 gate with tobacco. 



GREEN LETTUCE WORM. See under Cabbage. 



LICE. See under Plant-Lice. 



