THE CANADIAN ENTOMOLOGIST. 193 



terminal joint is thick anteriorly, but posteriorly it becomes membranous, 

 thus agreeing with tlie pleurites of the anterior rings ; the anal opening is 

 situated in the thickened part (Fig. i, b). The abdominal segments from 

 one to seven, like those of the thorax, have each a wide, more or less 

 wedge-shaped lateral expansion ; that of the first extends at right angles 

 to the body, but those of the following rings are, more and more, directed 

 backward, that of the seventh being parallel to the line of the body, so 

 that the oval outline of the larva is preserved, although the eighth segment 

 lacks the prolongations. There is a plain suture in the median or dorsal 

 line (Fig. i, c) ; there is also one dividing each ring at the base of the 

 pleurite (Fig. i, d). These lateral sutures or fissures aie more pronounced 

 on the terminal segments. The anterior, free edges of the pleurites bear 

 a few stiff hairs, while the outer edges are furnished with a close-set ample 

 fringe of sub-equal hairs. 



The general color is grayish brown ; under a lens there are blotches of a 

 darker hue spread over a lighter field ; moreover, the whole upper surface 

 is marked with irregular lines of black dots, which appear to be elevations. 



" The articulation itself is prolonged each side for a short distance 

 between the lamina of the expanded epidermis, so that the outline of the 

 proper fleshy portion is serrate." The epidermis of the upper surface is 

 somewhat corneous and thick. Figure 4 shows a cross-section of the 

 second abdominal segment. It exhibits the almost uniform arch above 

 and the thin tegument of the ventral surface extending out to form the 

 under surface of the pleurites. 



The head is not retractile, except in the sense that the upper surface 

 of the prothorax is permanently prolonged over and beyond it. The head 

 is flattened above ; the epicranial suture is short, the clypeo-cranial sutures 

 extending well up on the top of the head ; they terminate at the place of 

 insertion of the antennte. The suture separating the clypeus from the 

 labrum extends from antenuce to antenna (Fig. 5, e). There are six ocelli 

 in each group. When mounted as transparent objects, each shows an 

 oval outline, with a clear border surrounding a dark, more or less, oval 

 center. The resemblance to the reptilian blood corpuscle is very close. 

 Five of the ocelli are in a slightly curved line with their longer axes 

 nearly parallel ; the sixth is placed at the upper outer angle of the group, 

 with its axis at right angles "to those of the others. It is also the largest 

 one of the group (Fig. 9). There is a little patch of hairs between the 

 ocellus and the adjacent suture. 



