PAPILIO III., IV., V. 
yellow ; and that in the intervening zone both colors are found. Mr. Walsh was 
nearly correct as to the northern limit. The most northern point on the sea¬ 
board at which I have known Glaucus to be seen or taken was at Newburgh, on 
the Hudson River, lat. 41° 30',— where I resided several years, — and then but 
a single example. 
Dr. Hay, of Racine, Wisconsin, writes me that he once took Glaucus in his 
garden, and on another occasion saw one near the mouth of the Wisconsin River, 
lat. 43°. And Mr. Brewer states (Can. Ent., IX., p. 20), that in Nebraska, as far 
north as the Niobrara River, the black and yellow forms of female are about 
equal; lat. 42° 30b 
Although Turnus has been so long known to naturalists and has been re¬ 
peatedly figured, this, I believe, is the first attempt to bring the two sexes of the 
yellow form together. 
There has recently been some effort on the part of the adherents of a rigid 
priority to change the name of this species to Glaucus, that name having been 
given to the black female in 1767, antedating by four years the name Turnus ap¬ 
plied to the yellow male and female. One would think a century long enough 
to confirm a name even if originally given in error, especially in case of any spe¬ 
cies which had since been repeatedly figured and treated of in published works, 
and that nothing but confusion could result from a change after this lapse of time. 
But it happens in the present case that Glaucus is not the insect described as 
Turnus, being but a dimorphic form of one sex only, entitled as such form to its 
own special name. The species is Turnus, this form is Glaucus. 
Note.— From what I have observed at Coalburgh, the present season (1877), I think it probable that here, 
and to the southward, there may often be four annual broods of Turnus, instead of three, as stated above ; 
the existence of the fourth being dependent on the weather in April. This month was pleasant and warm, 
and different Papilios were exceedingly abundant; and, during the last week, the females of Turnus were freely 
depositing eggs. This would give ample time for the maturing of the larvm and emergence of the butterflies 
before the first of June, at which date the first of the three broods recorded had a beginning. I watched care- 
fully for yellow females, and had a good opportunity as the butterflies gathered about the fruit trees and lilacs, 
but I saw only four; while there must have been scores of the black form, if not hundreds. 
