TRIBE NYGMIINI n.
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Nygmia solitaria van Eecke comb. n.
   
Euproctis solitaria
van Eecke, 1928, Zool. Meded. Leiden, 11:129.
   
Euproctis walshae
Collenette, 1951, Ann. Mag. nat. Hist. (12), 4:1032, syn. n.
   
Euproctis walshae
Collenette; Holloway, 1976: 48.
   
Euproctis spec. near javana Aurivillius sensu Schintlmeister, 1994: Plate 7.


Nygmia solitaria (Peninsular Malaysia)


Nygmia solitaria (Peninsular Malaysia)
 


Diagnosis.
The forewing facies of the male is unmistakable, the yellow paler than in the javana complex and much more extensive in the apical and marginal zone. Females bear some resemblance to those of the javana complex, but the discal spot is set asymmetrically in the costal yellow triangle, and the marginal yellow is restricted to a more obliquely bordered apical patch.

Taxonomic note. The rearing of both sexes indicates the synonymy of walshae with solitaria: the species shows extreme sexual dimorphism, but the asymmetric position of the discal spot in the costal yellow triangle and the obliquely bounded apical area of yellow are seen in both sexes (see also sp. 2613).

Geographical range. Sumatra, Peninsular Malaysia, Borneo.

Habitat preference. N. solitaria is uncommon, mostly found in lowland forest localities such as the Ulu Temburong of Brunei, but also including areas cleared for cultivation such as at Tuaran in Sabah. One male was taken in lower montane forest at 900m on the limestone G. Api.

Biology. The species has been reared in Peninsular Malaysia by H.S. Barlow who described the larva as having an orange head flanked by lateral tufts of dark hair. There are two dorsal thoracic tufts of grey hairs and a further one anally, the grey hairs being black-tipped. The body is grey-black with a thin dorsal red line with white on each side extending posteriorly from the thoracic tufts. The legs and prolegs are reddish.

Pupation was in light silken cocoons within the leaves of the host-plant. The adults emerged between one and two weeks after pupation.

The host-plant was Dendropthoe pentandra (Loranthaceae), parasitic on Bauhinia kockiana (Leguminosae).

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