a 
Vs 
{er ee 
j 

SUANA CONCOLOR. 59 
a ee 
Some specimens lose the white spot and others are very 
dark, Expanse of wings, 52—64 millim, 
?. Much paler; the markings similar; fore aR with a 
small grey patch at the base. 
The form ampla-concolor has lost the white spot at end of 
cell of fore wing which is present in dimaculata ; all the inter- 
grades are to be found. Expanse of wings 106—146 millim. 
Pl. V, fig. 1, c, shows the pupa, @, the moth of this pest. 
Life History} 
The moth appears on the wing at the end of March and 
beginning of April in Northern India. It is not known as yet 
where it lays its eggs, but it will be probably found to be 
somewhere on or near its food-plant which is the sal tree 
{Shorea robusta, Gaertn.), When the young larve come out 
of the egg is not known, but towards the end of October 
they are nearly full grown and pupate about the middle of 
November, They spina tough, stout cocoon of coarse silk 
mixed up with much of their own hair which they fix either 
in crevices of the rough bark of the stems of large trees or to 
branches, twigs, or beneath the bark of the trees. The winter 
is passed through in this stage, the moth appearing, as already 
stated, at the beginning of April. 
Localities from which reported. 
The insect is common in the sal forests of the meters 
Dun in the NortheWest Provinces. Hampson gives through- 
out India and Ceylon, Philippines and Java as the habitat 
of this moth, 
Relations to the Forest. 
The caterpillar defoliates the s4l and at times this defoliation 
would appear to be somewhat heavy. Further observations are 
however, required on this point since this tree has apparently 
many defoliating pests, and it is necessary to determine which 
are those to be the most feared. 
Observation has, however, led me to the conclusion that it 
will not unlikely be found that the s4l defoliators of Assam 
ere en ee 
1 These observations were made by Mr. F. Gleadow, Deputy Conser- 
wator of Forests, Student Subramarian, and the writer. 
