258 THE CANADIAN ENTOMOLOGIST. 



Oviposition. — Eggs are laid from the middle of May to early June 

 and perhaps (exceptionally) later. They are placed singly on the new 



growth of the food-plant, Pinus rigida (pitch pine), either on the upper 

 surface of the scale leaves or tucked deeply among the still sheathed 

 bundles of needle leaves. All the eggs found in nature were in the former 

 position near the base of the new shoot, where the first elongation of the 

 stem occurs, never toward the apex (Plate 6, fig. i). The female selects 

 young trees from two to six feet in height, and apparently never oviposits 

 on those of larger growth. She lays from 25 to 40 eggs. I have 

 found several eggs by searching the young shoots with a pocket lens, and 

 twice have been fortunate enough to witness a female in the act of 

 ovipositing. One of these placed an egg only fourteen inches above the 

 ground on a pine just beginning its third year of growth. 



I have never found an egg or a caterpillar on P. strobus (which has 

 been considered the favourite food-plant), nor have I observed the butler- 

 fly in the neighbourhood of that tree except where rigida was also 

 abundant. 



The Egg. — Considerably larger than the egg of any of the congeneric 

 species ; echinoid, top flattened, at micropyle depressed, pale green. The 

 primary ornamentation of the shell consists (as in irus, Henrici and 

 aiigustus) of a raised reticulation, the meshes of which form fairly regular 

 equilateral triangles, and at each angle, except on the top and bottom, a 

 low rounded boss or knob. There is also a secondary ornamentation 

 difficult to describe, but giving the egg a frosted appearance and a super- 

 ficial similarity to the egg of Henrici. This ornamentation is in the two 

 eggs of much the same character, but in iiiphon is not so pronounced, does 

 not render the shell so opaque, and presents other differences easier 

 illustrated than described. Figures 5 and 6 give the side and top views 

 of the egg of niphon. The illustrations are from photomicrographs of an 

 empty shell, from which the larva very conveniently made its exit near the 

 bottom on the side, which appears to be somewhat flattened in fig. 6. 

 The magnificaiion is the same as was used in representing the shells of 

 irus and Henrici (Canadian Entomologist, Vol. XXXIX, Plate 4, June, 

 1907). 



Period of Incubation — Of thirty-three eggs laid by a confined female 

 on May igtli, 1907, between 9.30 a.m. and 1.30 p.m., the first hatched at 

 10.20 p.m on May aSth, the last at 2 p.m on June ist. The period, 



