PROCEEDINGS 1915. 101 



be found on the leaves, the old shelters and feeding grounds on the under 

 surface of the leaf alone showing where once the larvae had been at work. 

 There is but one brood a year in Nova Scotia. 



Description of Archips Rosaceana. 



THE EGG. 



Eggs oval, 1.2 mm. long, .80 mm. wide; laid overlapping, shingle-like, 

 in flat irregular pale green masses which appear as though covered by a 

 thin film of wax. The membrane enveloping the egg is very thin and 

 transparent and is traversed by a fine network of ridges which divide the 

 surface up into many irregular cells. This membrane is finely pitted. 

 The average number of eggs per egg mass, 159. 



THE LARVA. 



Stage I. Length after emerging from egg 1.7 mm. Head .24 mm. 

 wide, shiny black. V-Shaped suture arising at occiput and spreading to 

 clypeus. Mouth parts, light brown. General body, color pale yellow 

 to lemon. Prothoracic shield slightly darker in color, shiny. Tubercles 

 raised, also pale yellow, each bearing a short yellow seta. Thoracic and 

 prolegs and anal plate concolorous with body. 



Stage II. Length soon after moulting 2.6 mm. — Head .34 mm. wide, 

 light olive green, shiny, V-shaped suture distinct. Ocelli black arranged 

 in irregular masses at the sides of the head. Prothoracic shield also light 

 olive green, somewhat darker on posterior third. General body color dark 

 to dirty yellow. Tubercles now more distinct, being still concolorous 

 with body but more prominent, each furnished with a single hair. Anal 

 plate, thoracic and prolegs all concolorous with body. 



Stage III. Length in this instar 4.0 mm. Head .43 mm. wide, light 

 brown in color, shiny. V-shaped suture as in previous stages. Ocelli 

 black, arranged in crescent at sides of head. Prothoracic shield slightly 

 lighter in color. General body color dark yellow, the intestine showing 

 through as a darker orange band. Tubercles more distinct, raised above 

 and concolorous with the surrounding surface. Each tubercle tipped 

 with brown, and bearing a short seta. True legs black, prolegs dark yel- 

 low. Anal plate shield shaped, concolorous with general body color. 



Stage IV. Length 6.5 mm. Head .57 mm. wide, jet black, shiny, 

 V-shaped suture, spreading from occiput to clypeus, distinct, mouth 

 parts prominent,greyish, tipped with black. Prothoracic shield piceous, 

 bearing an anterior yellow band varying in width. General body color 

 yellowish green. Tubercles darker, tipped with black, each bearing a 

 silky hair. Spiracles raised, surrounded by a dark ring. Anal plate com- 

 paratively small, shield shaped, very light brown in color and furnished 

 with long hairs. 



