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 twig* 

 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 cotton}' 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 

 Aspi<li<>tiix (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. (Rile}' . ) 

 The female is 

 shaped like an 

 oyster shell. There are from ten to one hundred t-ggs 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. Riley has studied the habits of the A. conchiformis 



- 530. 



