252 THE CANADIAN ENTOMOLOGIST. 



posterior al?e, which barely attain the extremity of the pads of the 

 hemelytra. A straight suture marks off this segment from the next. The 

 abdomen is more than twice the length of the thorax, the segment follow- 

 ing the thorax slightly constricted. The sides of the abdomen are folded 

 over itself, and are furnished with fringing hairs. There is an indentation 

 in the edge at each segment that bears the thickening of the formative 

 pseudostigmata. The abdomen has only six apparent segments and the 

 siphon or air-tube. The false stigmata show in segments three to five, 

 dorsally, as thickenings of the integument, darker than the surrounding 

 skin. The siphon is jointed to the sixth segment, and freely movable. 

 The abdomen is keeled beneath, the keel bearing a fringe of short hairs 

 on each side, which meet those of the inflexed abdominal margin. The 

 legs approach more closely to the adult. The second so-called tooth or 

 prominence in the first pair is quite evident. 'I'he true tooth is large and 

 triangular, and the clawless tarsus rests against it when the tibia is folded 

 on the femur. The second and third pair are slender, ciliate, with globose 

 cox?e ; the tarsus of the second pair does not quite reach and the second 

 goes slightly beyond the end of the siphon. Both these tarsi are one- 

 j anted, and armed with prominent curved double claws. 



Size : Long., 44.4 mm. (from tip of rostrum to tip of siphon); lat., 2.9 

 mm. (at the thorax, but not at wing-pads). Siphon., long., 12.3 mm. 



Colour : More or less luteous of varying degrees, without any special 

 pattern. The legs, which in the preceding instars are banded, are 

 apparently unicolorous in this. This, however, may be the peculiarity of 

 the two individuals from which this description has been drawn up. The 

 eyes are black and shining. 



This individual arrived at the adult in eight days. 



The periods for each instai* are as follows, for the individuals bred to 

 maturity or to the third instar : 



Ova taken, May 20j 



Emergence, June 4, 



First moult, " 



Second " " 



Third *' July 



Fourth " 



Fifth •' " 20, " 



This gives 61 days from the ovum to the adult, or perhaps seventy 

 days, if we allow for the time that may have elapsed before the ova were 

 collected. The full number of instars is seven, as follows: one embryonal, 

 five nymphal, and one perfect adult. 



Mailed July 7th, 1906. 



