LYCAINID. ARAOTES. 447 
the short clasps soldered to the long intromittent organ, He found the species scarce at Mer- 
gui and Myitta, Burma, in the cold weather ; alsoat Barakhal in the Chittagong FIill Tracts. 
The figure shews both sides of a male specimen from Rangoon in my collection. 
I give below a description of the very beautiful and highly-aberrant genus Sz¢hon,* Hiibner, 
which is found in tie Malay Peninsula. 
* Genus Sithon, Hiibner, Verz. bek. Schmett., p. 77 (1816); id. (part), Moore, Proc. Zool. Soc. Lond., 1883, 
p. 526; id., Distant, Rhop. Malay., p. 253 (1885). ‘‘ForEWING, costa slightly arched at the base, afex acute, 
[rounded in the female], exterior margin very slighty convex, posterior angle not acute, posterior margin 
slightly convex, tufted beneath [in the male]. Costad nervure recurved ; first subcostal nervule ascending and 
touching the costal nervure near its end, emitted at one-third before the end of the cell, second at one-fifth. third 
and fourth from the end of the cell, no 7/t/ branch ; discoidad cell broad ; disco-cellular nervules slightly con- 
cave, of equal length, disco/da/ nervule trom their middle ; second median nervule from Close to the end of the 
cell, #27s¢ median at one-third before the end ; sudmedian nervure straight. HinpwinG, oval; costa almost 
angular in its middle, afex convex, exterior margin lobular near the anal angle ; discoidad cedd short, trian- 
gular ; first subcostal nervule emitted at one-third before the end of the cell; dzsco-ced/u/ar nervules oblique, 
recurved ; adzscoida/ nervule from their middle; ¢hivd and second median nervules from the end of the Cell, first 
median at one-half before the end ; sudmedian nervure straight, ixternal nervure recurved ; furnished witha 
longish slender ¢az/ from the end of the first median nervule, and a short lobate tail from the submedian nervure. 
Club of the axtenne slender ; a/fz porrect, laxly squamose beneath, second joint extending half beyond the 
head, third joint slender ; éegs squamose. Type, S. xedyond, Cramer,” from the Malay Peninsula, Sumatra, 
and Java. (Moore, |. c.) 
In the forewing of the male of the type species, the costal nervure extends to beyond the end of the cell; 
there are only two subcostal nervules, Mr. Moore counting the terminal portion of the subcostal nervure and 
the upper discoidal nervule as additional subcostal nervules ; the middle disco-cellular nervule is distinctly 
shorter than the lower, both disco-cellulars are almost upright. The shape of the hindwing is peculiar, 
though almost exactly as in the genus Dsufadia, Moore, but differs in the costal nervure being much longer ; 
the costa forming almost a right angle, of which the basal portion is the shorter side ; the disco-cellular ner- 
vules are extraordinarily outwardly oblique, more so than in any other genus known to me, the anal lobe is 
very long and narrow; the antennz are considerably more than half as long as the costa of the forewing ; 
the eyes are very hairy. £ 
The type, and, as far as I know, the only species of this genus hitherto described (except its probable female 
S. chitra, Horsfield), is S. nedymiond, Cramer. Mr. Moore, when redescribing the genus in 1883, placed in 
it a species which he named “‘ Sithon” indra, thereby implying that the alied species ja/indra, Horsfield, and 
tarpina, Hewitson, also belong to this genus. From my point of view these latter are widely separated from 
Sithon in having three instead of two subcostal nervules to the forewing, the male not furnished with a tuft of hair 
on the underside of the forewing attached to the inner margin, present in S. nedymond, and two tails instead 
of one to the hindwing. Overlooking the absence of one tail anda certain elongation of the hindwing, 
S. nedymond has a remarkable superficial likeness to those species, which probably led Mr. Moore to place them 
in thatgenus. In all of them the males are rich blue on the upperside, and have the underside remarkably and 
distinctively coloured, the base of both wings being pure white, the outerhalf deep brown. Such strong 
superficial resemblances, combined with marked structural differences, do not often occur. 
With regard to the Indian Lycenid@ with two subcostal nervules to the forewing, this is the only genus, 
except Zecla, Fabricius, and YVasoda, Doherty, MS., which has one tail only to the hindwing, and in this 
group it is absolutely unique in being furnished in the male with a tuft of hair on the underside of the forewing. 
Sithon nedymond, Cramer. Papilio nedymond, Cramer, Pap. Ex., vol. iv, p. 19, pl. ccxcix, figs. E, F, #ale 
(1783) ; Sithon nedymond, Hiibner, Verz. bek. Schmett., p. 77, n. 776 (1816) ; id., Moore, Proc. Zool. Soc. 
Lond., 1883, p. 526 ; id., Staudinger, Ex. Schmett., p. 277,pl. xcv, male (1888); Sithon nedymond, var. 
Distant, Rhop. Malay., p. 253, n. 1, pl. xxii, fig. 1, »ale (1885); Thecla nedymond, Horsfield, Cat. Lep 
E. I. C., p. 96, n. 28 (1829), Hasirar : Coromandel Coast (Cramer), Java, Sumatra (Moore), Sungei Ujong 
(Distant), Selangor. Expanse: Male, 1°55 inches (Cramer's figure), 1°35 inches (Distant), 1°20 (Selangor 
specimen). Description : MALE. ‘‘ UPrERSIDE, dot wings black. Forewing with a deep cyaneous patch 
covering the whole discoidal area, broader anteriorly and gradually attenuated towards the interior margin. 
Hindwing with abroad posterior border of the same cyaneous tint, passing parallel with the margin 
over one-third of the entire surface, with a regularly-defined inneredge. UNvERSIDE, doth wings white witha 
silvery gloss from the base tothe middle, and ferruginous-brown posteriorly, the boundary between the 
basal and apical portions being regularly transverse, extending from the middle of the costa over the disc to the 
anal region. /ovewing with the apical portion almost equally divided by an undulating blackish striga, the 
inner portion being of a more saturated reddish-brown tint. Aindwing has the dark portion decreasing in 
breadth towards the anal region, and terminating in a curve following the outline of the wing ; a deep black 
streak, regularly transverse and tending to the inner margin, stands at a small distance from the anal curve, 
accompanied by a solitary dot at each extremity ; the anal region is either entirely ferruginous or clouded with 
the brown ground-colour of the apical portion of the wing, sending off two short evanescent ferruginous striga, 
parallel with the margin ; this region is likewise adorned with several irregularly-defined black marks, covered 
with rich greenish metallic irrorations ; the first of these is an oce'late spot, exterior of the tail near the marginal 
notch, bearing a broad shining lunule, next follow two short opposite transverse streaks, tending to the anal 
appendage. and finally a short narrow attenuated line, parallel with the oblique portion of the anal angle ; the 
posterior margin isconfined bya black marginal thread, edged interiorly by a narrow white striga, which is 
more pronounced at the internal angle ; the surface of the anal appendage is black ; the /az/ tipt with white, 
Body black above, white underneath ; the sides of the addomen being annulated. Antenne delicately banded. 
Legs marked with broad alternate rings of black and white.” (Ho7s/ield,1 c.) 
* I have only seen one specimen of this species from the Malay Peninsula, which Mr. Godfery writes me 
that he caught ‘in a forest-path near the banks of the Linggi in Sungei Ujong.’ Itis evidently an extremely rare 
species. I have no knowledge of the female if it is not to be found in the rellowing: species ? [S. chitva, Hors- 
field,] and have treated the form here figured as a variety, owing to the transverse black streak above the anal 
angie on the underside of the hindwing containing some ochraceous markings not observed in typical Javan 
specimens,” (Distant, 1. c.) 
I have seen only one small male speciemen of this species from Selangor, It has the blue coloration of the 
upperside of a most brilliant and vivid iridescent shade. 
? 
° 
