30 NYMPHALID^. DANAIN.'E. IDEOPSIS. 



are indebted to Mr. J. Wood-Mason, Natural History Secretary of the Asiatic Society of 

 Bengal, in whose Journal it first appeared. 



Gonua 2.-1DE0PS1S, Horsfield. (Plate V). 



IcUopsis, Horsfield and Moore, Cat. Lep. E. I, C, vol. i, p. 133 (1857) ; Danais, sect. 4, Doubl., Gen. D. L., 

 p. 90 (1847). 



" Closely resembles Hestia in form, colouring, and texture of the wings, and to which it 

 has another resemblance in the absence of the sexual spot on the hindwing. Like some 

 species of Danais, and like the genus Hestia, it has the first subcostal nervule anastomosing 

 with the costal nervure. Like most species of Hestia the genus Ideopsis has the wings some- 

 what diaphanous, white ; the outer margin, nervures, nervules, two or more vitt^e in the cell, and a 

 series of dots between the nervules, sometimes coalescing, all fuscous ; but notwithstand- 

 ing these points of resemblance, it may always be known from Hestia at first sight by its 

 distinctly clavate antennas, and on closer examination by its claws devoid of paronychia and 

 pulvilli." (Doubleday, 1. c.) 



The Butterflies belonging to this genus were for a long time included under Danais, and 

 form section iv of that genus in Westwood's Genera of Diurnal Lepidoptera. They are a 

 fairly well-marked group, and are distinguished from all species of Danais by the Hestia-\\!v.Q 

 style of their markings and colouring, and from all except the first group Radena by the 

 absence in the males of the sexual spot or pouch on the hindwing. Six species are known, 

 all from the Indo-Malayan region, only one species extending into the Indian limits in Tenas- 

 serim ; the same species occurs also in China, the other five are insular and local. 



7. Ideopsis da0S| Bolsduval. (Plate V, Fig. 4 ^). 



Idea daos, Boisd., Sp. G^n., vol. i, pi. xxiv, fig. 3 (1836); Hestia eudora, Gray, Lep. Tns. of Nepal, p. 10, 

 pi. ix, fig. 3 (1S46) ; Idea diardi. Veil., Tijd. Ent., vol. iii, p. 44, pi. ii, fig. 4 (i860) ; Hestia daos, Doubl., List. 

 Lep. Brit. Mus., pt. i, p. 52 ; Ideopsis daos, Horsfield and .Moore, Cat. Lep. E. L C, vol. i, p. 134 (1857). 



Habitat: Tenasserim, Malay Peninsula, China. 



Expanse : 4*0 to 4*4 inches. 



Description : Male : Both wings white, thickly irrorated with grey scales, semitrans- 

 parent, markings black, and also the nervures, which are more or less broadly bordered with 

 the same colour. A narrow black line extends round both wings ; cilia very short, black, 

 white at the interspaces. Forexving with the whole of the costa black, and containing a basal 

 streak about one-third the length of the wing, and three spots gradually decreasing towards 

 the apex and equidistant from each other, white. Three black streaks in the discoidal cell, 

 the anterior onei mmediately behind the subcostal neivure ; the other two in the middle of the 

 cell, joined about midway and not quite reaching the base of the cell. A large irregularly- 

 shaped spot occupies the outer end of the cell and extends a little beyond it. A discal series 

 of six spots parallel with the outer margin between the nei-vules, the apical three small and 

 conical, the point inwards, the lower three larger and circular. A marginal series of large 

 spots placed on the nervules, between each pair of which on the folds are a pair of small 

 marginal spots. A streak between the median and submedian nervures. Hindwing with a 

 large spot occupying the outer extremity of the cell, from which issue two streaks united to- 

 wards the base of the cell and which they do not reach. A discal series of six oval spots, the 

 third and sixth from the apex the smallest, placed between the nervules. A marginal series 

 of spots on the nervules, and between them a series of more or less pear-shaped spots, their 

 points resting on the margin. The submedian nervure is widely bordered with black ; between 

 it and the first median nervule is a black streak (Penang specimen). The female differs from 

 the male in the wings being shorter and broader, and \.\\e forexving not being emarginate. The 

 ground-colour is also pure diaphanous white, all the markings smaller and clearer. It has also 

 an additional spot on the forewing between the discoidal nervules (Singapore specimen). 

 Underside in both sexes, as above. 



The caterpillar and chrysalis of Ideopsis daos were discovered by Captain Hamilton on the 

 Tenasserim coast ; and are figured by Horsfield and Moore (Cat. Lep., E. I. C, vol. i, plate iv, 

 figs. II, II a). The caterpillar is about two inches in length, furnished with four pairs of 



