30 
AECTIID^E. 
wings of this species^ when saturated with benzine, sliows no difference wliatever from those 
of Phaos vigens, nor are any of the characters by which it is separated at all reliable. The 
genus Phaos is also described as the Spihsoma of Stepliens (the type of whicli is S. menthastri 
of Europe) : the latter difi'ers in the much more woolly clothing of the thorax ; broader and 
comparatively shorter tcgulfe ; more slender and longer antennae ; narrower, longer, and more 
scantily clothed palpi ; much more slender legs ; more robust abdomen, without lateral or 
anal tufts ; comparatively longer and narrower M'ings, which are also less densely scaled ; more 
Jiearly approximated veins ; and totally different style of coloration, — in short it would be 
difficult to find two genera of Arctiidaj less alike, excepting in the general distribution of the 
veins ; but if this character alone were recognized, the bulk of the genera of this family would 
probably have to be placed together. 
Lachana ladakensis. (Plate CXXI. fig. 6.) 
Lachaua ladakensis, Moore, Proc. Zool. Soc. 1888, p. 398. 
Primaries pale yellowish brown ; basal third grey, bounded externally by an ill-defined 
oblique darker band ; an ill-defined dusky spot at centre of costa, followed beyond the cell by 
a second lunate costal spot; a black spot on the discocellular veinlet; an irregularly zigzag 
submarginal greyish-brown band and a regular border of the same colour; fringe spotted 
with brown : secondaries greyish brown, with a broad dark brown external border and pale 
fringe : body black, clothed with long silver-grey and pale brown hairs ; antennae with orange 
basal joint, shank pale brown, pectinations dark mahogany-brown. Wings below paler, most 
of the markings on the primaries obliterated; the secondaries pale yellowish bi'own, with 
smoky-brown external border and buff-coloured fringe : body below blackish, clothed with 
pale brown hairs. Expanse of wings 26 millim. 
Ladak. 
At first sight one w'ould suppose this species to be more nearly related to Antarctia or 
Cycnia than to Phaos ; but a close examination of its structure proves its affinity to the latter : 
Mr. Moore unaccountably refers it to the Liparidae. 
DIPHTERA, Ochs. 
Diphtera fasciata. (Plate CXXII. fig. 1.) 
Diphtera fasciata, Moore, Proc. Zool. Soc. 1888, p. 408. 
Nearest to D. pallida : primaries dull greyish green ; seven mostly equidistant black 
costal luarkings, the third and seventh broad and elongated, the others mere dots or small 
spots ; three additional basal spots ; an irregular white-edged black marking at base of inner 
