o 



2 IHE CANADIAN ENTOMOLOGIST. 



crenulate ; when freshly moulted, flat and thhi, without wax secretions. 

 The bodies of the mature pupaj appear to be raised from the surface of 

 the leaf by a vertical wax fringe, the height of the body then being about 

 one-third of the width. The dorsum is rugose and nearly flat. There are 

 two pairs of marginal spines : llie first pair occurs on the caudo-lateral 

 margin, and the second pair on the caudal margin. The second pair in 

 length is between one-tenth and one-eighth the length of the body, and the 

 first pair less than one-fourth the length of the second pair. These last are 

 readily seen by clearing the pupa in xylol and mounting in xylol balsam, 

 or by boiling the pupa-case in KOH and mounting in glycerine. The 

 second pair curve upward and backward, diverging at the base, usually 

 converging posteriorly. There are three pairs of minute dorsal spines as 

 in the previous instars : the first pair is on the cephalic region ; the second 

 pair, one on each side of the first abdominal segment ; and the third pair 

 one on each side opposite the operculum of the vasiform orifice. Of the 

 three pairs, the third pair is slightly the largest. The segmentation of the 

 abdomen is fairly distinct in the middle ; that of the thorax less so. The 

 vasiform orifice is longer than broad, in form similar to a triangle with 

 rounded corners. The orifice is bounded laterally by chitinous ridges, 

 which unite posteriorly, thus differing from previous instars. The 

 operculum is hemielliptical (in the form of an ellipse cut through 

 its shortest axis), reaching from the anterior margin of vasiform orifice to a 

 little over one-half the distance toward the apex. The lingula has 

 one apical lobe and three pairs of side lobes, and is densely covered with 

 longitudinal rows of minute setfe. From the sides of the apical lobe from 

 below arise two spines, one on each side, which extend caudad beyond the 

 apex of the orifice, their length being a little less than one-half the 

 greatest width of the operculum. A second pair, less than one-fifth as 

 long as these, arises one on each side between the first and second side 

 lobes. The anterior pair of side lobes is frequently hidden by the 

 operculum. A shallow furrow extends caudad from the apex of the orifice 

 to the margin of the body. 



There is no lateral wax fringe in this instar. The dorsal wax 

 secretion consists of a double submarginal series of glassy waxen rods. 

 The rods of the inner series are never farther away from those of the outer 

 series than the width of their bases. The outer series consists of from 

 about sixty to one hundred (sixty-six to ninety-eight are the limits actually 

 observed) rods of variable length, some being very short, while others ^r^ 



