118 Journal New York Entomological Society. [Voi. xxv. 



Color. — As in the previous instar, but conspicuously darker on 

 thorax, due to the presence of larger wing pads which are fringed 

 with black hairs and covered with a short pile of dark hair. 



Structural Details. — The wing pads now extend a little past the 

 thorax and cover at most a third of the first abdominal segment as 

 shown in the drawings. 



The hairs on lateral margin of the abdomen are now too numerous 

 and profuse to be characterized. 



It may be noted here that the basal half of the fore tibia, as in 

 previous instars, is equipped on its inner margin by a definite patch 

 of minute hairs, reminding one of a part of a tonal device figured by 

 Dr. Abbott. 



Fifth Instar. 



Si:~e. — Si::e. — General measurements : 



Mm. 



Width of head i.7S 



Greatest abdominal width 1.75 



Length of body 4-375 



Specific measurements : 



Femur. Tibia. Tarsus. 



Prothoracic leg .618 .787 



Mesothoracic leg 1.57 -913 -664 



Metathoracic leg 996 .996 1.66 



Color. — Due to its size, the pattern is now distinct, though the 

 same arrangement as in former instars. The abdomen has four 

 broken longitudinal lines, plainly marked, and a faint median line. 

 In all the instars the newly moulted nymph is white to the naked eye. 

 The eyes are red and the margin of the body appears dark, the black 

 hairs giving to the body its only color, save the median dorsal glands 

 which show through as orange red patches. These possess a pair of 

 openings on their caudal convex margins, the anterior margin being 

 broadly heart-shaped. 



The newly moulted nymphs make interesting objects for life activ- 

 ity studies. The pulsation of the dorsal vessel, the silvery branching 

 of the tracheae, the green malphigian tubules and the outline of the 

 digestive tract are inviting to one with an investigational turn of 

 mind. 



Structural Details. — As in previous instars, the pegs in the 

 scooping surface are a little longer, but as yet all are alike. There 



