THE CANADIAN ENTOMOLOGIST. 251 



length of the bug, and reach but little beyond the extremity of the 

 respiratory tube. The first pair are not quite as broad proportionally as 

 in the i)revious instars, and Lhow the same undulations of the femora 

 where the second tooth will be. 



Size : Long, (extremity of the rostrum to end of siphon), 19 mm.; lat., 

 1.4 mm.; air-tube, long., 4 mm. 



My one nym[jh came to the third moult in seven days. 



Fourth Nymphal Instar. 



Form as before. Rostrum but slightly changed. 



AntenncT evidently three-jointed, the prominences more developed, 

 and the several spines on the third and second segments quite evident. 



Legs and tarsi as before, with the peculiarities more accentuated. 

 They extend only a little beyond the siphon, and are therefore not as long 

 as the body by the length of the thorax. 



Colour more or less mottled, with banded legs. General tint grayish. 



Size : Long., 30 mm.; lat. (not taken, specimen being only a cast 

 skin in this instar); air-tube, long., 7 mm. 



The specimen attained the fourth moult in eight days. The short- 

 ness of the nymphal instars in the hot days of July is worthy of notice. 



Fifth Nymphal Instar. 



Form elongate as in the adult. Head, including eyes and exclusive 

 of rostrum, broader than long. Rostrum as before, but nearer the adult 

 shape. The second joint begins to show the basal constriction so notable 

 in the adult. 



The rostrum is shorter than the length of the head. Eyes trans- 

 versely elongate, somewhat flattened on. the inner margin, projecting 

 beyond the expanded anterior portion of the prothorax. Antennae are 

 still two-jointed, the basal joint extending into a process, nearly as stout as 

 the terminal joint, and about three-fifths as long. The suture between the 

 joints is very faint. The joints are now abundantly furnished with the 

 tactile spines, w^hich reach full development in the adult. Prothorax 

 widened anteriorly by tlie sockets of the anterior pedes, gradually con- 

 stricted towards middle, and expanding again basally, but not quite as 

 broad as the anterior portion : excavate anteriorly for the insertion of the 

 head and truncate posteriorly. Prosternum not sulcate, deeply excavate 

 posteriorly. Mesoihorax with long narrow wing-pads of the hemelytra, 

 pointed posteriorly in the middle. Metathorax concealed. First 

 abdominal segment showing as a ring between the wing-pads of the 



