THJfi CANAJJIAN kntomologist. 51 



to the outer edge of the white band of Arthemis (as in Butt. N. A., i, 

 pi. 41, figs. I, 2). It is rarely or never solid white, of clear colour, as in 

 Arthemis, but is slight and often nebulous. 



3. South of the territory occupied by Arthemis is the black species, 

 Ursula, flying to the Gulf of Mexico and at the southwest, in Arizona at 

 least. Over a considerable belt, say perhaps of fifty to one hundred 

 miles width, along the southern range of Arthemis and northern range of 

 Ursula, many examples have been taken which are undisputed Ursula, 

 but have more or less distinct traces of a white stripe similar to that seen 

 in Proserpina (Butt. N. A., I., pi 41, figs. 3, 41, for such an example 

 of Ursula), though never so heavy as in the most strongly marked 

 examples oi Proserpijia. South of this belt, so far as I am aware, such 

 striped examples have not been taken. Ursula without modification or 

 variation occupies many degrees of latitude, but in the southwest comes 

 to be considerably changed and is lost in its variety Arizonensis. 



4. I myself obtained eggs from a female Proserpifia at Stony Clove, in 

 the town of Hunter, in the Catskills, elevation 2,000 feet, and from these 

 eggs raised four pupae from which came three Arthemis and one 

 Proserpifia (this last is figured in Vol. II. before cited), so establishing the 

 dimorphism. The relationship of the two forms had been suspected but 

 never proved. Mr. Mead relates, Can. Ent. VII., 162, that he obtained 

 about 500 eggs from fifteen females Arthemis, and 31 eggs from a single 

 female Proserpina at same time, showing the black female to be as fertile 

 as the pied one. 



5. I am thoroughly familiar with this part of the Catskills — in fact 

 was born and bred in the town of Hunter — and for many years collected 

 butterflies there, and I can say positively that I have never seen an 

 example of Ursula there. It does not fly at all in that elevated district. 

 On reaching the Valley of the Hudson, ten miles west from Stony Clove, 

 Ursula begins to appear. Nowhere is the surface in Hunter at less 

 than 1,700 feet, and all the highest peaks of the range are within the town 

 limits. Between the Clove and the river valley are Round Top, High 

 Peak, etc., and the lowest ground is the summit of the Kaaterskill Clove, 

 elevation nearly 3,000 feet. 



6. In preparing the text for L Arthemis for Butt. N. A., I made 

 careful enquiries about Proserpina all along the line from Maine to 

 Wisconsin, and published the information gained. This form was rare in 

 Maine, not common in south New Hampshire, unknown in Vermont, as also 



