312 



AN ECONOMIC ENTOMOLOGY. 



to penetrate the webs and come into direct contact with the 

 larvae. 



Sometimes insects of this series are not confined to green 

 vegetation, as in the case of the "clover-hay worm," Asopia 

 costalis, which attacks the dry or partially dry product, webbing 



will readily destroy the larvae. As against the "clover-hay 

 worm," nothing is better than to feed up clean from year to year. 

 Never put new hay upon old, and if stacked outside, lay upon 

 rails so as to get ventilation underneath. Salting the first two or 

 three feet has also been recommended, and will probably be 

 effective. 



In the PhycitincB there are many sombre-colored little moths, 

 usually of some gray tint, with rather narrow fore and broad 

 hind wings. The insects rest with the wings closely folded 

 around the body, the head a little elevated, and the palpi project- 

 ing forward, giving them rather an impertinent appearance. The 

 caterpillars are largely internal feeders, attacking fruits in many 

 cases, sometimes living in the stems of plants, sometimes spin- 

 ning up among leaves, in rare cases feeding openly. Occasion- 

 ally they make a case or sac which they carry about with them, 

 and in which they are more or less protected. 



We have several more or less troublesome species that are 



The clover-hay worm, i and 2 ; its cocoon at 3 ; 

 the pupa at 4 ; the moths, Asopia costalis, at 5 and 

 6 ; at 7 the tubes made by the larvae. 



Fig. 356. 



it up and causing more or 

 less injury. Its near ally, 

 Pyralis farinalis, may be 

 found in barns or bins 

 where grain is carelessly 

 stored, and the caterpil- 

 lars make little tubes, 

 formed partially of silk, 

 partially of fragments of 

 the grain and even of en- 

 tire kernels, upon which 

 they feed. Rarely, how- 

 ever, are they abundant 

 enough to do serious in- 

 jury, and as against both 

 cleanliness will go far, 

 while bisulphide of carbon 



