528 



HEMIPTERA. 



Other bark- lice belonging to another genus, Lecanium, are 

 found in hot-houses ; they differ from the preceding in being 

 flat, scale-like, without any traces of rings, and have eight- 

 jointed antennae, while the males have nine joints to the an- 

 tennae, and are two-winged. L. hesperidum Linn, is found on 

 the orange. 



The Editors of the American Entomologist (p. 14) describe 

 the Lecanium Maclurce (Fig. 530, b) which lives on the twigs 

 and leaves of the Osage orange. ' ' The dark part is the scale 

 covering the insect, and this scale, as usual in the genus to 

 which the insect belongs, is of a blood brown color. The pale 

 part is snowy white, and is composed of a fine cottony down 

 enveloping the eggs and young larvae." A similar species, L. 



acericola (Fig. 

 530, a) "infests 

 the bark as well 

 as leaves of the 

 common maple." 

 The common 

 bark-louse of the 

 Apple tree be- 

 longs to the genus 

 Aspidiotus (A. 

 conchiformis) and 

 does more injury 

 to that tree than 

 any other insect 

 known. It is also 

 found on the cur- 

 rant, plum and 

 pear. (R i 1 e y . ) 

 The female is 

 shaped like an 



Fi *- 530 - 



oyster shell. There are from ten to one hundred eggs laid 

 by the female. Westwood states that the males of this genus 

 are very broad, with broad wings, and a central anal appen- 

 dage, but without the usual caudal filaments. The puparium 

 has a double shield. 

 Mr. Kiley has studied the habits of the A. conchiformis 



