4 
Indian Forest Records. 
[Yol. VI 
In addition to the species given in the table above, the following 
commonly occurred, but usually as late arrivals after the establish¬ 
ment of one of the former group : — 
Ipidae : Xyleborus aplanatus, Mich. 
„ laticollis, Bldfd. 
,, parvulus, Eichh. 
., perforans , Woll. 
,, schlichii , Steb. 
,, semigranosus , Bldfd. 
,, submarginatus, Bldfd. 
„ n. spp. 
Eccoptopterus sexspinosus, Motsch. 
Platypodidae : Crossotarsus bonvouloiri, Chap. 
,, saundersi, Chap. 
Platypus cavus, Stroh. 
,, cupulatus , Chap. 
,, solidus , Chap. 
,, pilifrous , Chap. 
Cerambycidae : Dialeges pauper , Base. 
Chlorophorus n. sp. 
Xylotrechus buqueti, Lap et Gory. 
and several unidentified species of Curculionidae and Brenthidae. 
It will be seen that the species most numerously met with is Hoplo- 
cerambyx spinicornis , while Diapus furtivus occurs in a very small pro¬ 
portion of the dead trees. 
It would appear logical to conclude that the death of the tree was 
due to that species of insect which attacked first, but, as is shown below, 
in the greater proportion of cases, the insect is of secondary importance 
and a primary factor exists to which the death of the tree can be assigned. 
At the suggestion of Mr. B. S. Hole, Forest Botanist, the writer ex¬ 
amined the roots of Sal which had died in the Duars forests for signs 
of disease, and found that in very many cases they were attacked by 
a fungus Poly poms Shoreae, Wkfld., which causes complete rotting of 
the root-system below soil level but gives little sign of its presence above 
ground. The root-fungus has since been found to be extensively dis¬ 
tributed in Bengal and Assam Sal areas. Its economic importance 
is discussed by the Inspector-General of Forests in his Inspection Note 
on the Buxa and Jalpaiguri Forest Divisions (Hart, 1915 pp. 2—3) 
and by the Conservator of Forests in the Annual Progress Report on 
Forest Administration in Bengal for 1914-15, and it is only necessary 
f ^ ] 
