THE INSECTS OF NEW JERSEY. 



789 



come into houses at times and are not usually noticed as being different 

 from the common species. 



In the larval stages the 

 habits differ. Many, perhaps 

 the most, are scavengers, as 

 are the muscids; a few are 

 parasitic, as are the Tachi- 

 nids; quite a number feed in 

 living vegetation, either in 

 roots, as the onion and cab- 

 bage maggot, or mine in 

 leaves, as in beets. 



The root maggots are diffi- 

 cult to deal with, and not all 

 methods are equally useful in 

 all localities. Tobacco, helle- 

 bore, kainit, lime with car- 

 bolic acid or turpentine have 

 all been used as repellants or 



destroyers With more Or less Fig. 330. Head and scraping hooks of a root mag- 

 got, very much enlarged. 



success. 



Bisulphide of carbon injected into the soil has proved useful in some 

 cases, and so has a tarred card surrounding a plant and resting on the 

 surface. The farmer must usually learn by experience the particular 

 method most useful in his locality. 



HYDROT/EA Desv. 



H. dentipes Fab. Pemberton V, 10 (Hk). 



H. armipes Fall. New Brunswick (Sm) ; Riverton V, 14, Avalon VII, 22 

 (Jn); Pemberton V, 10 (CG). 



H. impexa Loew. Dunnfield, Del. Water Gap VII. 

 H. metatarsata Stein. Clementon V, 3 (Hk). 



OPHYRA Desv. 



O. leucostoma Wied. Boonton VII, 19 (GG); New Brunswick VI, 1 (Sm); 

 Westville VII, 21 DaCosta VII, 19, Shiloh IX, 1. 



HOMALOMYIA Bouche. 



H. canicularis Linn. New Brunswick VII, Burlington Co. (Sm) ; Delair 

 III, 1, bred from nest of "Vespa germanica" (Dke). 



H. scalaris Fab. Del. Water Gap VII (Jn) ; New Brunswick (Sm). 



H. incisurata Zell. Shark River VII, 12. 



H. fasciculata Loew. Delaware Water Gap VII. 



