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Callidula waterstradti sp. n.  
Callidula jucunda Felder sensu Holloway, 1976: 91, and Kobes, 1990: 109.

Callidula waterstradti

, 12-14mm. The species is slightly smaller than jucunda with narrower forewings that have clearer, paler orange markings. The dorsal zone of the forewing and all the hindwing are yellower brown, and the latter in the male does not have the pale costa of jucunda. The forewing orange markings are of a slightly different configuration to those of jucunda, being more or less separated into three components by dark brown bars or spots. The forewing underside ground is almost entirely ochreous yellow, whereas in jucunda the discal spot is a distinctly more orange area. In the male genitalia of waterstradti the valve is somewhat triangular, as compared to a parallelogram in jucunda. It has a more extensive zone of setae ventrally and a diagnostic patch of them basally at the centre. The aedeagus vesica has fewer, longer cornuti in the cluster. In the female the apodemes are shorter, and there is a greater zone of sclerotisation associated with the signum in the bursa.

Holotype . NORD BORNEO: Mont Kina Balu, 5.8.1903 (John Waterstradt).

Paratypes: 3, 1 as holotype; 1 BORNEO; Kina-Balu, recu de Staudinger, Janv. 1894, ex Oberthür colln; 1 (misc. families slide 15) Kina-Balu 92-136 (A. Everett); 1 (slide 10) SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) G. Api, 427550, 900m Camp, 20.4.1978; 1 (slide 7 ), 3 (slide 11), Cambridge Expedition to Mt Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway) various localities.

Geographical range. Borneo, Sumatra, Peninsular Malaysia.

Habitat preference. This is a predominantly montane species, recorded infrequently from 1200m to 1930m on G. Kinabalu and singly at 900m on the limestone G. Api in recent surveys.

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