Part I.] Beeson : Life-History of Diapus furtivus, Sampson. 25 
stages, but, in another locality and in another tree, the general stage of 
development represented will be quite different. 
It is probable that, in the hottest months of the year, development 
is considerably retarded, if not entirely checked, though no definite 
aestivation may occur. There is, however, little evidence at present 
as to the state of activity during the hot weather. 
Natural Enemies. 
It is chiefly in the adult stage that Diapus furtivus is subject to 
the attack of natural enemies. During the great part of its life, within 
the tree, it seems to be remarkably well protected against predaceous 
and parasitic enemies. 
Several species of Cucujidae, Colydiidae, etc., occur commonly as 
mature beetles under bark of Sal trees infested with shot-hole borers, 
but, to what extent they are predaceous on Diapus furtivus, and in what 
stages, remains to be worked out. Many of the species cannot be pre¬ 
daceous in the galleries as beetles, on account of the size and form of 
their bodies. 
Many species are new and many have not been identified. 
Colydiidae. 
Xuthia Sicana, Pascoe, Microprius dijficilis, Grouvelle, occur com¬ 
monly under the bark of Sal in the United Provinces forests. 
Asosylus filiformis , Grouvelle, and Asosylus n. sp., occur in the 
galleries and appear to be direct parasites in Bengal. 
Sysolus ? sp. A remarkable long tubular beetle, which occurs 
commonly in the galleries of Diapus furtivus, and is probably its most 
important predator. 
Cerylon quadricolle, Sharp, observed occasionally in the galleries of 
other shot-hole borers. 
Cucujidae. 
Hectarthrum heros, Fahr. (Bengal, United Provinces, Central Pro¬ 
vinces). Stebbmg (1914, p. 116) mentions observing it eating Platypus 
sujfodiens in Burma, and says loc. cit., p. 623, that “ its grubs enter 
the tunnels of the platypids and feed on the platypid larvae.” 
Cleridae. 
lillioera assamensis, Steb. Stebbing (1914, p. 632) states that this 
beetle is predaceous on Diapus furtivus and Diapus quinquespinatus in 
Assam. 
Stignatium spp: Two species of this genus, at present unidentified, 
are predaceous in the adult stage on swarming beetles of Diapus furti¬ 
vus in Bengal and the United Provinces. 
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