Packard.] II^SECTS OF THE TLANT HOUSE. 



117 



the body is a series of minute tubercles, alternating witli the 

 fine hairs fringing the edge. 



Anotlier destructive scale insect is represented by figure 

 81 (a, male ; 6, female ; d, scale ; c, female of another species 

 Fig. 81. Fig. 82. 



Fig. 83. 



Oranse Scale Insect. Fern Scale Insect. 



also found on the orange). It is the orange bark louse, and 

 infests both tlie orange and lemon. It is so abundant at 

 times that all the branches of the plant have to be cut back 

 to the trunk. It closely resembles the apple scale insect, and 

 is called Aspidiotus Gloveru. 

 It is possibly the A. aurantii 

 or citi'i of southern Europe. 

 The fern bark louse, or 

 scale insect (Fig. 82 ; 6, un- 

 derside ; enlarged), found fre- 

 quently on ferns of the genus 

 Pteris, seems to be identical 

 with the Lecanium of the 

 ferns, L. fiUcum of European 

 authors. It is regularly oval 

 elliptical. Along the middle 



of the body runs a prominent Lecaniinn platyceiii and larva. 



ridge, considerably thickened in the middle, with two trans- 

 verse ridges. It is of a rosy tint, pale around the edge of 

 the body, and with a darker patch in the angles between the 

 median and transverse ridges ; beneath fiesh-colored. 



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