EXPERIMENT STATION BULLETINS. 



677 



Figure 12. 

 Lccanium perforatum. — Antenna ; spiracular setae ; find 

 ventral view of anal-plates; f, fringe setae; sa, sub-apical 

 setae : a. apical setae, the last named on dorsal surface. 



LECANiuM (S.assctia) oleae Bern. 



Adult female oval in form and strongly elevated. Dark-brown or 

 black, marked on dorsnm by one median and two transverse carinae 

 suggesting the letter H; size from 1/8 inch to 3/lG inch in length. Sur- 

 face somewhat wrinkled radially; antennae slender, eight-jointed; derm 

 marked by minute, short tubercles closely packed together. Spiracular 

 setae with the middle one long, curved and slender while the two outer 

 ones are short and pointed, knife-like. Anal-plates with lateral angles 

 broadly rounded, cephalo-lateral margin much shorter than caudo-lat- 

 eral. Fringe setae four on each side, sub-apical setae four on each side. 

 Apical setae small, three on dorsal surface on each plate. One discal 

 seta on each plate. 



Found only under glass in Michigan, on a variety of hosts. An im- 

 portant enemy of citrus fruits in mild climates. 



