I have, for three seasons, raised Euchaetes collaris from the larva, it being very abundant in this locality, and present the following notes as the result of my observations :

The larvæ feed on the Apocynum androsaemifolium, or Spreading Dogsbane. They will in confinement feed on Asclepias, but I have never, after careful search, found but one of the larvæ on it in the field. They feed at night, leaving their food-plant and hiding themselves during the day.