104 THE CANADIAN ENTOMOLOGIST. 



28th ; eggs hatched July 2nd ; larvae transformed July 24th to 28th ; final 

 metamorphosis Aug. 7th to 19th. 



Near New York City probably three broods during a season are the 

 rule for this species ; of the last generation apparently only the gravid $ 9 

 hibernate ; "since more 9 9 of faded appearance, and almost destitute of 

 eggs, were taken during the first days of May within the Sumach-brush, on 

 the hills near Patterson, N. J. Of the European Geometridae only y^ p.c. 

 hibernate in the imago state (VVemsburg). 



The preferred food-plant seems to ba Rhus glabra, though the larvaa 

 also feed on Rhus hirta and R. copallina, with the changeable leaves of 

 which the bright colours of the moth perfectly harmonize ; these often rest 

 in the manner of butterflies, with the wings meeting perpendicularly over 

 the back. 



All the (^ (? of the two broods were Sabulodes arcasaria, Wlk., and 

 all the 9 9 -S"- sulphurata. Pack., with no intermediate forms. 



The description of $, and $ in Packard's Monograph is exhaustive, 

 and it may only be added that the first generation of the $ $ has the 

 yellow basal part of the wings often very prominently variegated by brown 

 irrorations, the basal line becoming very conspicuous ; while the July 

 brood has the yellow space mostly plain, even the basal line being often 

 wanting. The extension of the brown outer part of the wings is variable, 

 often covering, especially on secondaries, the larger part of the wings. 

 With many specimens the brown is more or less clouded by yellow towards 

 the basal part. 



The 9 ? seem less inclined to variation, but with a few the whole 

 space beyond the indicated outer line is of a delicate pale ochre. 



The difference in size is very considerable, as might be expected from 

 the appearance of the mature larvtij • the specimens measure across the 

 wings : ^ $ from 3.0 to 3.9 centim. ; % % from -^.-i, to 4.49 cen. 



The eggs are nearly elliptical, finely punctured except the smooth, 

 more rounded micropylar end, which is ornamented with rather large, 

 elongated cells. Longest diameter 0.65 millim. 



The nevvly-hatched larvae are very slender, cylindrical and smooth to 

 longitudinal fold, only first segment slightly enlarged. The head at this 

 stage is considerably wider than the body, rounded above, flat in front, 

 not specialized, rather smooth, of a deep tan colour, with darker ocelli. 



