Vol. XXviii] ENTOMOLOGICAL NEWS. IO3 



period it is quite possible to find all stages feeding together at 

 the same time. 



About the time the maximum number of adults have emerg- 

 ed the proportion of sexes is equal. Later, however, many 

 of the males disappear and about the time egg-laying is well 

 under way the females are in the majority. As it approaches 

 time for the hatching of the eggs the adults lingering on the 

 plants are practically all females. It thus appears that either 

 the females have greater vitality or that the males die soon 

 after copulation. Egg-deposition requires from two to three 

 minutes. The ovipositor is pulled from its sheath and the fe- 

 male touches the surface of the leaf with it until a suitable 

 place is found. It is then thrust into the tissue until the ab- 

 domen rests against the leaf and then withdrawn. 



EGG & NYMPHAL STAGES. 



Egg. Length 0.4 mm., width 0.18 mm. These are smooth, white and 

 flask-shaped, with the neck bent to one side. They are deposited in 

 the leaf tissue along the mid-rib and larger veins, being found as a rule 

 in the younger leaves. Each egg is inserted in the tissue with the cap 

 extending slightly above the leaf surface, each cap being visible as a 

 whitish oval or irregular circular ring. Sometimes, but not always, the 

 cap is covered with a brownish scab-like crust. From one to ninety 

 eggs have been found in a single leaf, most of them being placed 

 irregularly along the mid-rib. In many leaves, the eggs can readily be 

 located by holding the leaf up to the light and examining with a hand 

 lens, each egg appearing as a light oval spot surrounded by a reddish 

 or dark discoloration. 



ist Nymphal Stage. Length exclusive of tubercles 0.4 mm. Body 

 elliptical, slightly broadest at middle of abdomen. General color white 

 except tips of ultimate and penultimate antennal segments, bases of 

 legs, line on front of head extending to base of rostrum, middle dorsal 

 surface of abdomen and tubercles on head and abdomen which are 

 brownish. Two tubercles on posterior margin of head, one on vertex 

 in front and between them. One median dorsal tubercle on the 2nd, 

 5th, 6th and 8th abdominal segments. Antennae three-fifths the length 

 of the body. Rostrum extending to last pair of legs. Eyes lateral, not 

 prominent, consisting of five distinct ommatidia. Antennae and tuber- 

 cles in this and the following nymphal stages covered with secreting 

 hairs. 



2nd Nymphal Stage. Length exclusive of tubercles 0.55 mm. Body 

 elliptical, color white except tips of ultimate and penultimate antennal 



