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E. A. ANDREWS 



of filter paper was moistened and placed on the long-dried 

 beetle across both elytra and thorax, there flashed out under it 

 instantly a dark blackish area very striking against the pale 

 whitish background: much as in figure 3. This dark area slowly 

 extended as the moisture spread in the substance of the shell. 



Fig. 3 Photograph of dead male Dynastes tityrus, showing distribution of 

 dark spots on light colored elytra; and the persistence of a dark colored cross 

 on the thorax, produced by placing a cross of wet filter paper there just before 

 photographing and immediately photographing the dark red cross left when the 

 paper was removed. 



Upon removal of the paper the black melted away in one minute 

 like a dissolving cloud, but left after fifteen minutes some faint 

 trace of the outlines of the former dark cross. 



Again when the moist breath was blown from a fine pipette 

 upon the side of the elytron for part of a minute, a red spot 

 appeared where the breath struck the shell, growing from the 



