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Superfamily: Bombycoidea Latreille, 1802
In New Jersey and states of that general latitude, caterpillars consume hickory, walnut, and sweetgum. Double brooded stock first appears from late April to May with the second brood appearing nine to eleven weeks later.
In the more southern latitudes, larvae favour persimmon. Adult moths fly at eight to ten week intervals starting in March, allowing for at least three broods. Adult Actias luna have been taken in every month in Louisiana.
Lunas which emerge in the spring often have a red lateral line on each side of the body and usually have narrow outer red margins on both fore and hind wings. This red colouration is absent from subsequent broods.
Adults usually eclose from their cocoons in mid morning. The cocoon is rather flimsy and valveless. The moth makes quite a racket as it heaves itself against one end of the cocoon, tearing at the silk with hornlike projections near the base of the forewing. A secretion called cocoonase helps to break down the sericin binding the silk.
Photo courtesy John H. Campbell
The soft moth (female to left, note narrow antennae) can escape through a hole roughly 3/8 inch in diameter. Once
out of the cocoon, the moth must climb to hang its wings for inflation.
Despite having witnessed hundreds of eclosions in my lifetime, I still often pause to watch lunas eclose and inflate in emergence cages.
All of the giant Saturniidae pump fluid into veins in soft stubbly wings while hanging from stems, tree trunks, etc.
Photo courtesy of John H. Campbell.
The adult Saturniidae moths have no mouth parts or feeding tubes. The moths live for 7-10 days as adults, utilizing fats stored from caterpillar days.
Once coupled, the pair will remain that way until the following evening. In captivity siblings will mate readily, even in a small cage. Wild males are easily attracted. Scenting or "calling" usually continues until around 1:00 am or until the female has mated, whichever comes first.
Males usually emerge a day or two before females and it is rare that an unmated female would be captured at a light as females usually don't fly until after mating.
Caterpillars, which grow to approximately 3.5 inches (9 cm.), are predominantly green throughout their five instars and spend roughly one week in each stage except the longer fifth instar. Larvae which are going to overwinter in the pupae/cocoon stage take on a dark amber or burgundy-brown colouration just prior to spinning cocoons.
Some caterpillars will use a leaf wrap while others descend to spin up among whatever ground protection they can find. Mature larvae "clear their guts" with a loose, runny stool just prior to cocooning.
Luna cocoons are papery thin and pupae outlines can easily be seen when the cocoon is held up to a bright light. Winter diapause stock tends to spin a courser, darker silk. In regions of the United States where lunas are double or triple brooded 25-40% of early brood stock caterpillars will spin the darker cocoon and overwinter instead of eclosing that same summer.
I store my winter diapause stock in small, loosely-lidded containers holding 10-20 cocoons each in the refrigerator crisper. I have not had problems with dessication even though I do not mist the cocoons. Cocoons may also be stored outdoors in a more natural environment in protective cages.
The pupae are dark brown and the
antennae outline can be seen on the pupal shell to determine sexes.
Click on food plant information to see a caterpillar image and a listing of foodplants.
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