114 



ARTHROPODA 



FIG. 132. Museum pest (Anthrenus varius). Larva 

 below the open pupa case, and adult above. 

 Photograph enlarged three times. 



cleaned, at almost any time of the year. It feeds on any 

 kind of woolen material. It is probable that there are two 

 broods a year, but the beetles are most frequently seen on 



the windows in 

 April. A similar 

 beetle, the museum 

 pest (Anthrenus va- 

 rius), destroys 

 many kinds of 

 dried museum ma- 

 terial. Carbon bi- 

 sulphide, a fourth 

 of an ounce to each 

 cubic foot, will de- 

 stroy any of these 

 beetles or their 

 Iarva3 if the box or closet containing them is closed 

 tightly for a day. 

 The ladybird fam- 

 ily (CoccinellidcB), 

 containing about a 

 thousand species, 

 should be known 

 to every one, as 

 nearly all of its 

 members are 

 friends of man. 

 They are of a more 

 or less hemispheri- 

 cal form, and usually of a red or yellow color with 

 round or lunate black spots. The larvae, which are 



FIG. 133. Ladybird beetle; a, larva; 6, pupa; c, 

 adult. Line at the right shows natural size. After 

 Chittenden. 



