PROCEEDINGS, 1916. 47 



small cell or channel in the pith where they rest while in the pupal stage. This cell 

 greatly resembles their bodies in size and shape. In all cases the hole through which 

 the larva entered the stem was partially stopped up with particles gnawed off by the in- 

 sect while forming the pupal cell. The larvae regularly rest with their heads down to- 

 wards the exit hole, with the exuvia of the last larval moult at the caudal end of the cell. 

 Two weeks after pupating the adults commenced to emerge. In Nova Scotia there 

 are three generations in a season. 



DESCRIPTIONS. 



The Egg. 



The eggs of this insect are laid on the under surface of the leaf, beneath the epider- 

 mis, where they cause a distinct swelling more or less oval in outline and of a yellowish 

 green color. When removed, the eggs are whitish, more or less translucent, and resemble 

 a sunfish in shape with the ocelli of the developing larvae showing through the egg mem- 

 brane as round brownish spots. Length .46mm., width .37mm., thickness .23mm. 



The Larva. 



STAGE 1. — Length in first instar 1.1mm. Head .21mm. wide, very dark olive 

 green. A very fine Y shaped suture arises at the occiput and spreads to the clypeus, ex- 

 tending in a thin whitish line over the epicranium and diverging at a point slightly above 

 an imaginary line drawn between the ocelli. A single ocellus, situated in a circular black 

 patch, is placed at either side of the head. Mouthparts slightly darker than head. Gen- 

 eral body color greyish green, the body tapering gradually from the base of the head 

 to the anal end. True legs, fleshy, translucent, jointed, each terminated in a single 

 hook. Prolegs, consisting of eight pairs, concolorous with body. 



STAGE II. — Length 2.4 mm. Head ,32mm wide, darker than in stage 1, being 

 now more of a dark brown color. Ocelli and mouthparts as previously described. Y 

 shaped suture still present, darker in color and not so distinct. Body color somewhat 

 darker green, the intestine showing up more clearly and transmitting its color to the 

 surrounding tissues. True and prolegs as in stage 1. 



STAGE III. Length, when extended, 8.5mm. Head .43 mm wide, dark brown over 

 vertex, but much lighter in region of the mouth. Mouthparts very light, brown, except 

 labrum, which is darker. Ocelli jet black, arranged in circular black area at sides of the 

 head. Y shaped suture present in various stages, now very indistinct, especially over 

 the vertex. General body color pale green. Prolegs concolorous with body. True legs 

 very light brown. 



STAGE IV. Length soon after moulting 11mm. Head .55mm wide, variously mark- 

 ed with light and dark brown; the vertex, labrum and a broad irregular band stretching 

 between the ocelli being dark brown, while the rest of the head, including the balance 

 of the mouthparts, is more of a yellowish brown. Ocelli as in previous stages. Dorsum 

 apple green, deeper in color at point where it joins the venter. Venter very pale green. 

 Prolegs concolorous with venter. True legs translucent, showing a very faint trace of 

 brown, especially at tips. 



The Pupa. 



Type of pupa free. Length 7.5 mm. Width, where widest, 1.5 mm. Body soft and 

 translucent. Head dirty white to very light brown. Ocelli three, brown, arranged in 

 triangle between the compound eyes. Compound eyes large, black and shiny. Mouth- 

 parts concolorous with head, except tips of mandibles which are brown. Antennae 



