_ ERRATA, 
Explanation of Plate III, below should read “larva” instead of “larve.” 
Page 21, line 23, should: read “Plate V, below” instead of “Plate V, 0.’ 
Page 21, line 25, ‘should read “Plate VI, right” instead of “Plate VI, a.” 
Page 21, line 36, should read “Plate III, below” instead of “Plate ITI, ¢. 
Page 21, line 36, should read “Plate VI, left” instead of “Plate VI.” 
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