THE CANADIAN ENTOMOLOGIST. 233 



drawn on the thoracic joints than with other species. The colour is a 

 purplish brown, showing very dark on first four abdominal segments. 

 The ordinary lines on the thoracic joints are a pure white, their 

 continuation on the last four joints show as soiled and yellowish. 

 Head is large, very finely granulated, of a chestnut colour ; width 

 .13 inches. The cervical shield is larger than usual in this stage, a 

 hard shining plate of a shade lighter than the head, and has the ordinary 

 black edging. The anal plate is at once unique, and offers perhaps the 

 strongest point of specific distinction. Instead of being similar in 

 texture and colour to the shield, its surface is plainly roughened or 

 granulated ; colour deep black, and its area consumes about all of the 

 dorsal space on the last segment. What is usually a separate plate 

 preceding the anal one on this segment, is in this case one confused 

 area. The few sette that arise from the borders of this plate are stouter 

 than with other species. The tubercle arrangement is of the conventional 

 form, the lateral ones clustered around the spiracles, and all, together with 

 the last-named organs, are intensely black. Special mention may be made 

 of IV. on abdominal joint seven as being raised a little above the line of 

 the spiracles, a feature that holds with all that are strictly root-borers. On 

 the next to last joint I. and II. are very large and with their opposites are 

 merged into a conspicuous quadrate patch, which, preceding the unusual 

 anal plate, gives a very protected look to this extremity. Length of insect 

 1.6 inches; duration of stage uncertain, perhaps fourteen days. 



Final stage : The bulk and diameter now greatly increase ; colours 

 become more translucent ; head and shield become heavier and darker, 

 the former now measuring .17 inches across. Thoracic legs stout and 

 shining black. The crochets of the abdominal feet are very strong, and 

 although no microscopic comparisons have been made here, it is safe to 

 say these are better developed than in the other species treated. 



Tubercle arrangement remains the same, though I. and II. are 

 perhaps less conspicuous. Large examples measure slightly over two 

 inches in length. When full-fed they become very restless, in captivity 

 at any rate, boring in and then out of the earth at frequent intervals, for 

 a couple of days prior to the final rest. 



The pupa is correspondingly large and robust, of a dark brown, much 

 less shining than ordinary. The shell appears thicker, as there seems no 

 difference in hue even when the imago is ready to burst forth. Cremaster 



