SCALE-INSECTS. 23 



brown,, somewhat convex, some bright yellow and often quite 

 globular. In spring, examination of a young larva of Cteno- 

 chiton viridis a species veiy common on the above plants Avill 

 frequently show, either within the insect, or on its waxy test, or 

 between the test and the insect, minute specks, which under 

 a high power of the microscope, prove to resemble the filaments 

 composing the brown or the yellow spots just mentioned. On 

 turning over one of the brown fungi, or on pulling it to pieces, 

 the dead body of a young Ctenochiton or Lecanium larva will 

 always be found in the middle. Apparently this brown fungus 

 does not attack any but young larvae ; but the bright yellow 

 fungus will be found filling the bodies also of the females in 

 the second stage, and the globular portion of the fungus will 

 stand out above them. These fungi are not of the same 

 genus as Empusa, the fungus which so frequently kills the 

 house-fly; but they seem to act in much the same way within 

 the insect. 



Probably a good many of the Lecano-diaspida are preyed on 

 and destroyed by these fungoid parasites, of which figures are 

 given in Plate xxiii. 



