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EASY GARDEN BUTTERFLIES

Zebra BluesLeptotes species

Zebra Blues are small (wingspan 20-30 mm) low-flying butterflies in the Lycaenidae (Gossamer-winged Butterflies), subfamily Polyommatinae (Blues, Bronzes, Hairstreaks etc.). Blues are tiny to small butterflies, many of which have brilliant blue uppersides (although some are dull grey or brown). 

The image with upper sides shows a pair in courtship mode prior to mating. Male Zebra Blues (left) are shiny blue above and differ from their females (right) which have a checkerboard pattern of grey on a white and blue ground. The undersides have irregular grey stripes on a white ground, resulting in their common name. Like many Lycaenidae they have short hindwing tails positioned next to prominent eyespots (particularly on the underside) that create a predator-confusing ‘false head’ effect.

There are four species of Leptotes Zebra Blue. Common Zebra Blue Leptotes pirithous, Short-toothed Zebra Blue L. brevidentatus, Jeannel’s Zebra Blue L. jeanneli, and Babault’s Zebra Blue L. babaulti, which have identical wing markings to one another. The only way to tell them apart is to dissect them and that means killing the butterfly. Who wants to do that? Most of the ones we see are the Common Zebra Blue; it really is just that; common!

Males choose a perch on top of a bush or on a prominent rock and fly off to chase other butterflies. They settle often and readily open their wings to reveal the upper side. They also like to sit on damp earth and mud, sucking up dissolved minerals. They may also suck nutrients from old bones or carnivore dung. Females are found close to the host plants or on flowers.

Distribution

Zebra Blues are found all over South Africa except for the central Nama Karoo and the highest altitude grasslands. They are common all over Africa, the southern Arabian peninsula, Madagascar, and the Indian Ocean islands. The Common Zebra Blue is found in Europe and even reaches the south of England, where it rejoices in the name ‘Lang’s Short-tailed Blue’! 

Egg

Leptotes pirithous

Common Zebra Blue

Leptotes pirithous

Female Zebra Blues lay tiny, pale blue eggs singly on buds or flower stalks of the host plant. They turn white as they mature. They are flattened disks 0.5mm in diameter by 0.3mm high.  They have double rows of whorled white ribs that are joined by horizontal ribs on the side to create a pattern of triangles with a tiny mole where they meet. There is a prominent dark mark at the centre of the top. The egg stage lasts about six to seven days.

Caterpillar

Leptotes pirithous

Common Zebra Blue

Leptotes pirithous

Zebra Blue caterpillars are small, and slug-shaped, as are most caterpillars of the Lycaenidae. Fully-grown caterpillars are extremely variable in colour ranging from green to grey or pink with markings picked out in dark green, pink, white or brown. The skin is covered in tiny bristles and appears velvety. The bristles also vary in colour. The larvae eat the ovaries and seed pods of the flowers, or the growing shoots of the plant. They grow from 1mm to 13-15mm long in three or four moults over a month to six weeks. They have a ‘honey gland’ on their rear segments like many other Lycaenidae, which attracts the attentions of ants. 

Pupa/Chrysalis

Leptotes pirithous

Common Zebra Blue

Leptotes pirithous

Zebra Blue pupae are smooth-skinned with tiny bristles. They vary in colour from watery green to pale brown with a varying amount of black or brown speckling. The caterpillars pupate on their host plant among dead flowers or leaves, or on stems. They are attached by tiny hooks on their tail to a silken pad spun by the larva and by a silken girdle around their ‘waist’. They are about 7-9mm long, and of a typical rounded Lycaenid shape. The adult normally emerges in about three to four weeks although it can be as quickly as two weeks.

Host plant

Zebra Blue caterpillars feed on plants like Leadwort Plumbago auriculata, a popular garden plant. Few gardens that have this will not have these little Blues flying around it. All the Leptotes use other plants in the Pea family, Fabaceae. Indigoes Indigofera sp. are popular, as are Rattle-pods Crotolaria sp. and Cow-peas Vigna sp.

Plumbago auriculata flowers

Leadwort

Plumbago auriculata

Leadwort with Cape Honeysuckle

Plumbago auriculata and Tecoma capensis

Indigofera velutina

Indigo

Indigofera velutina

Black-eyed Pea

Vigna unguiculata

How to attract them

Gardeners can encourage the presence of this butterfly by planting any of its host plants, which is quite easy to do as there are so many of them and they are good garden subjects in themselves. Not only do they provide food for Zebra Blue caterpillars, but they are also among the finest nectar plants for all butterflies, especially Leadwort.

Leadwort makes a good hedge, particularly when planted with Cape Honeysuckle Tecoma capensis.