Common Dusky Blue
(previously known as Holochila hyacinthina)
CANDALIDINI, POLYOMMATINAE, LYCAENIDAE, PAPILIONOIDEA
(Photo: courtesy of P. and M. Coupar, Museum Victoria)
This species is probably named after the Ancient Greek God: Hyacinthus, or else the flower that is named after him.
The Caterpillars are green with orange patches on segments four and nine. They taper to the rear, and are covered in sparse short white hairs. The Caterpillars feed at night on the young shoots of various species of Dodder Laurel ( Cassytha, LAURACEAE ) such as :
and grow to a length of about 2 cms. In captivity, they have been found to eat each other, and should be kept separately.
The pupae are a mottled brown, and are flattened with flanges on the abdomen. The pupal length is about 1.3 cms. The pupae are typically attached to the foodplant by anal hooks and girdle.
The adults have a wingspan of up to 4 cm. In the males, the upper surfaces of the wings are dark bronze. The females are also bronze, but have a substantial area with a blue sheen on each wing.
The undersides are fawn, with arcs of darker spots. There are two prominent black spots under the tornus of each forewing.
The eggs are very pale green, round, and flattened, with a diameter of about 0.7 mm. They are laid singly on flower buds and young shoots of a foodplant.
The adults are usually restricted to small areas around the foodplant. The males establish territories which are vigorously defended, and land with wings half open in a state of readiness, an attractive sight when they are freshly emerged.
The species is found down most of the eastern seaboard of mainland Australia, including
Several races have been proposed :
The adults are often confused with those of Candalides erinus. One diagnostic difference is that on the underside of the hindwing of Candalides hyacinthus, the medial and postmedial arcs of dark markings curve in parallel to each other as they approach the hind margin.
Further reading :
Michael F. Braby,
Butterflies of Australia, CSIRO Publishing, Melbourne 2000, vol. 2, pp. 764-766.
A new race of the Butterfly Candalides hyacinthina Semper Family Lycaenidae,
North Queensland Naturalist,
Volume 20 (1952), p. 33.
Beitrag zur Rhopalocerenfauna von Australien,
Journal des Museum Godeffroy,
Volume 5, Heft 14 (1879) pp. 162-163, No. 78.
Johann Gottlieb Otto Tepper,
The Papilionidae of South Australia,
Transactions of the Royal Society of South Australia,
Volume 4 (1882), p. 30, and also Plate 2, fig. 10.
(updated 9 June 2008, 1 November 2013, 9 July 2020)