186 THE CANADIAN ENTOMOLOGIST. 



remarkable in tin's were it not for tlie fact that /// one vital point Edwards's 

 description does not correspond to Sciidders. And yet the discrepancy is 

 not mentioned, and was probably overlooked, though it was presumptive 

 evidence of error. The solution is that Scudder described and figured the 

 egg of irns, ivhile Edwards described the egg of Henrici. To assist any 

 who may be inclined to doubt the worth of my judgment in the 

 matter, I have reproduced in the plite photomicrographs of the egg-shells 

 of irtis (fig. 6) and Henrici (fig. 5).* The shells are magnified equally. 



Edwardsf described the egg o{ Henrici 2i% follows : "Shaped like that 

 of Lyccena pseudargiolus ( Cyaniris ladon). and marked very much in the 

 same manner ; the top flattened, and at the micropyle depressed ; about 

 this List are three concentric rows of minute spaces, rhomboidal to irregu- 

 larly pentagonal ; the remainder of the surface is covered with ■^ frosted 

 network, the meshes of which are triangular, and from each angle rises a 

 low rounded knob ; colour whitish-green " 



Comparison with Ims Egg.—T\\^ value of a description is greater 

 in proportion to the emphasis placed upon comparative characters, and 

 although the egg of Henrici has a greater general resemblance to that of 

 niphon than to either aitgustus or irus, I have, for obvious reasons, chosen 

 to contrast it with the egg of the last-named species. The most striking 

 difference between them is that ihe primary ornamentation (consisting, in 

 both, of bosses connected by slightly raised ridges), which in ims is clear, 

 unobscured and easily made out. is in Henrici covered, and greatly obscured 

 by a secondary ornamentation ditlicuU to analyze, but rendering the shell 

 nearly opaque, and giving the appearance described as " frosted " by 

 Edwards (and by Scudder in his description of niphon). Under a 

 moderate power the new-laid egg is green, flecked with minute white points 

 where the irregular surface catches the light, and studded with large and 

 l^rominent white bosses. New-laid irus eggs are of about the same shade 

 of green, the smooth surface not catching points of light, studded with 

 small, more numerous bosses not at all prominent. As the embryo larva 

 develops, the green colour is lost, but in irus the colour of the caterpillar 

 (yellowish) is visible through the transparent shell, while in Henrici this is 



"Siiue tin- plioloiniiToyraphs have unavoidably lost somewhat in beinj^ 

 reprodiued, 1 have made arranj^-ements with the maker, Mr. Jas. A. Glenn, 65 

 Xorlh Pearl Street, .\lbany, \. V., whereby any who may desire to do so can 

 purehase prints from the n.>-alives (slij^litly l.-iri^i-r and showiiiq- detail more 

 ele:ti-I\) ril U'li eents each. 



I I'upilio, I, I 51J. 



