In Canada, single-brooded Hemaris thysbe stock flies in June and July. In New Jersey there are at least two broods of this hawkmoth and in Louisiana there are six broods at thirty day intervals with the first brood peaking at the end of March. Regular sized moths emerge from seemingly small pupae when this species is reared in captivity. Larvae pupate in thin walled cocoons under leaf litter. Scan to right shows cocoon formed under a paper towel.
Females call in the males with a pheromone released from a gland at the tip of the abdomen.
Hemaris thysbe larvae feed on viburnum and related plants and the clearwing adults captured with a butterfly net on June 1, were put in a sleeve over growing viburnum. The sleeves I use are made out of a very light weight material called Remay cloth. The cloth is intended as a spring garden cover. The sleeve is more like a sock, six feet long with a six foot circumference. I pull it over a few branches of viburnum and then insert the captured moths.