INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 





Arsenical sprays, applied when the larvae become apparent, are also 



effective. 



Natural Enemies. — Internal hymenopterous parasites perform a 



very important role in checking the ravages of this pest, Caterpil- 



Fig. 3 S ' » . — Adult male and female of th> j brown daj 

 moth. Pseudoliazis eglanterina Boiscl. Natural size. (Male, 

 author's illustration. Mo. Bui. Cal. Hort. ('nm.; female, 

 original ) 



lars are often found with the cocoons of these parasites attached to 

 the bodies. The eggs are also destroyed in large numbers by small 

 parasites. 



THE YELLOW BEAR CATERPILLAR 

 Diacrisia virginica (Fabricius) i Family Arctiidse) 

 [Spilosoma virginica (Fabricius) 1 

 (Fig. 



Description. — The moths have pure white heads, thorax and wings 

 with black eyes and usually two small black spots on each of the 

 wings. The abdomen is orange-yellow, marked with white and four 

 or five rows of black spots. The antennae and legs are white with 

 black markings and the front Legs arc also profusely marked with 

 orange. The average length is aboul g inch and the wing expanse 



