a 
10 Mr. A. G. Butler's Descriptions of new 
18. Orgyia approximans, Nn. 8. 
3. Nearly allied to O. gonostigma, but the wings nar- 
rower and more produced at apex; the white spots of 
primaries smaller, only two (instead of four to five) at 
apex; the ground colour of the primaries darker, so that 
the blackish spots are less perceptible ; expanse of wings, 
1 inch 4 lines. 
One male. ‘Tiokei (Fenton). 
19. Orgyia thyellina, un. s. 
Somewhat allied to O. trigotephras, but much larger 
and darker; the primaries more produced at apex; the 
basal third and the internal border as far as the white 
lunule (which is large and prominent) testaceous, mot- 
tled with dull ferruginous or mahogany-brown; re- 
mainder of wing blackish brown, crossed just beyond the 
cell by a broad belt of scattered testaceous mottlings ; 
three testaceous-bordered black spots in an oblique series 
above the white lunule near the external angle; three 
spots, of which the two upper are black, bordered with 
testaceous and white, in a reversed oblique series across 
the apical area; an indistinct marginal series of grey- 
edged subconfluent black spots; this series forms an 
elbow inwards at external angle, and consequently at 
that point becomes submarginal; secondaries very dark 
chocolate-brown; fringe with pale basal and external 
lines; body greyish; under surface of wings fuliginous- 
brown; primaries with shining whity brown internal 
border; body below whity brown; expanse of wings, 
1 inch 33 hnes. 
One male. Tokei (Fenton). 
A very distinct species. 
20. Porthetria wmbrosa, n. s. 
Of about the average size of P. dispar of Europe; but 
at once separable from that species by the diffused ill- 
defined character of all its markings, and the absence of 
the blackish dentate-sinuate discal line beyond the cell 
of the primaries; the externo-discal dentate-sinuate 
line is present, but less clearly defined; expanse of 
wings, male, 1 inch 10 lines to 2 inches; female, 2 inches 
3 to 5 lines. 
