GRAPTA I. 



At the last moult, nearly all these were light-colored, many being cream- 

 white, and scarcely half a dozen were black. On 4th June, they began to 

 change, and by Cth, there were thirty-five chrysalids. On 10th June, the first 

 imago appeared, and by 13th, there had emerged thirty-four l)utterflies, 23*, IP, 

 every one Drijas. One died in chrysalis. Dryas may be considered as the 

 prevailing early summer form of the sjiecies, and Comma the autumnal. 



A memorandum of the experiment made in 1873 was comnaunicated to the 

 "Canadian Entomologist" for October of that year, and I proposed that the 

 name of the species should be Comma, and the two forms be designated as vars. 

 Hurrisii and Dryas, in the same way that Inferrogationis is known in its two 

 forms as Interrogationis vars. Umhrosa and Fahricil, this formula expressing 

 clearly the relationship established. 



A similar connection may exist between other Graptas. From the fact that 

 the two forms of Interrofjatlonls differ much in outline of wing, in color and 

 markings, while the silver discal spot is identical, and that the same holds good 

 of the two forms of Comma, I should not be disposed to look for relationshijo of 

 this nature between two in which the discal spot is essentially different; as where 

 one bore the C and the other the angular mai-k seen in S'denus. That is one 

 reason wl\y I do not believe Gracilis will be found dimorphic with Faumis as 

 suggested l\y Mr. Scudder ; the discal spot of the former species being a bent 

 mark something like SUenus, but more like Progne, and of the latter a G, with 

 barbed ends. The two species have been found inhabiting the same localities 

 in the White Mountains, N. H., and on Anticosti Island by Mr. Couper. But in 

 the Catskills, where Faumis swarms in the month of August, the united collecting 

 of Messrs. Meail and Meyer with myself, embracing at least six seasons, have 

 never brought to light one Gracilis. Now wherever one form of Interrogationis, 

 or one of Comma is found, both are found, and it is hardly allowable, unless 

 proved, that Faumis could be dimorphic in one district and not in another. 

 Progne and Comma both associate in the Catskills with Faumis, though in vastly 

 less numbers. Mr. Couper wrote me on his return from Anticosti, in November, 

 1873, that Avhile there, on 21st July, he found a Grapta caterpillar feeding on 

 wild currant : in color " yellow, with long and short black marks on its sides ; " 

 and the spines were all "pink colored." The length of this was one inch, and 

 therefore it was near maturity. As this is not the description of Progne, nor 



