Publ. 23. III. 1933. 
COSSUS. By M. Gaede. 
809 
1. Genus: Cossus F. 
This genus has been dealt with already in Vol. II, p. 418, and Vol. XIV, p. 541. 
1. Group. Vein 6 of forewing arises from the cell- angle. Antennae of 
£ bipectinate to the tips. 
C. acronyctoides Mr. Forewing greyish-brown, greyer at the apex with black undulate lines obliquely acronydoi- 
distad. The border between the inner and exterior areas at the costal margin at %, obliquely inwards, more 
distinctly inwards at vein 3 and then parallel to the upper part to 3 / 5 of the inner margin. Hindwing pale 
brown with indistinct reticulate lines. 32 44 mm. Bombay, Mhow, Nilgiris. It reaches the palaearctic 
region in Cashmir and was therefore dealt with in Vol. II, p. 420, pi. 52 p. 
C. nigromaculatus Hmps. Body blackish-brown. Forewing brown, greyer towards the costal margin, nigromacu- 
A black spot at the costal margin near the base, a small one above the centre of the cell. A dark irregular 
submarginal band from the costal margin behind the cell to the upper inner-marginal vein, projecting to the 
margin at vein 3. Besides a black apical spot. Fine dark reticulate lines in the distal half of the forewing. 
Hindwing paler. $ 60 mm. Nilgiris. 
C. kinabaluensis $p. n. (93 i). Thorax ochreous, abdomen dark greyish-brown. Forewing reddish-brown kinabaluen- 
at the base and inner margin, then turning dark brown as far as % of the costal margin, then vertically sts - 
to the latter as far as vein 5, then distally convex and more indistinctly defined almost to the anal angle. 
The apical area behind it is creamy white, containing a few dark reticulate lines, chiefly at the costal margin 
and anal angle. A black wedge is in the middle of the lower inner-marginal vein. $ 60 mm. Kina Balu. 
C. cadambae Mr. (93 i). Thorax and forewing dark red-brown. Two short dark lines in the cell-end cadambae. 
and a few in the marginal area, irregular, continuous. Sometimes the marginal area or also the inner-mar¬ 
ginal area is lighter. Abdomen and hindwing lighter red-brown. 40 48 mm. Calcutta. 
2. Group. Antennae of longer pectinated, a p i c a 11 y serrate. A r e o 1 e 
of forewing larger. 
C. parvipuoctus Hmps. Body and forewing brown with a few indistinct dark spots around the cell- parvipunc- 
end and 3 more distinct spots above the middle of the lower inner-marginal vein. 45 mm. Naga Hills. 
C. pallidalae Hmps. Body whitish ochreous. Forewing white, slightly suffused with reddish-brown, pallidalac. 
especially in the cell. Numerous undulate dark streaks in the cell and below vein 2 as far as the inner 
margin. Some dark streaks also in the distal area. Hindwing white. $ 35 mm. Sikkim. 
C. polygrapha Lower. Thorax whitish ash-grey, patagia edged with black. The two first abdominal polygrapha. 
segments are greyish ochreous, the third somewhat rusty red, the rest dark brownish-grey with white hair- 
tufts. Forewing light brown with round spots of white and black scales. The veins before the centre of the 
wing are black. A white shadow from the centre of the base to before the centre of the wing, bent down¬ 
wards at vein 1 to % of the length of the wing, then widened to % of the costal margin and to the anal 
angle. 12- 15 dark lines composed of striae from the costal margin almost to the inner margin. A small 
white spot in the submedian fold. A fan-shaped spot at the costal margin before the apex as far as vein 
1. Hindwing dark brown at the base with brownish ochreous hair. $ 28- 35 nlm. Australia. Described as 
Cossns, but it may belong to Azygophleps. 
3. Group. Antennae of 3 thickened an d dentate, not pectinated. 
C. fuscibasis Hmps. Body dark brown, abdomen grey at the end. The interior two thirds of the fore- fuscibasis. 
wing brown, dusted with dark brown. A lighter stripe below the cell, distally bordered by the black exterior 
band which has a very irregular course, being strongly angled at vein 4 arrd despatching an inward branch 
above vein 1. Distal area grey with black striae and reticulate lines. Hindwing blackish-brown at the base, 
distal area grey with dark reticulate lines. $ 46 mm. Burma. 
C. diloratus Swh. Body dark yellowish wood-coloured. Forewing reddish-brown as far as a faded chloratus. 
line from % of the costal margin to the anal angle, yellowish-white behind it. The whole wing with dark reticulate 
lines forming a larger indistinct spot behind the cell and three smaller ones above vein 2. Hindwing greyish- 
brown. 34 — 36 mm. Borneo, Minahassa, Bangka. subfuscus Sn., from Sumatra, is not very different, subfuscus. 
c smaller G 25 mm). The yellowish-white distal area is almost parallel to the distal margin, subfuscus $ Sn. 
is chloratus q. 
X 
101 
