Insects Bred from American Larch 81 
Pogonocherus mixtus, Neoclytus longipes, Chrysobothris 
blanchardi, C. sex-signata, C. dentipes and Anthaxia quer- 
cata. The associated predators and parasites were the same 
as for NV. longipes. 
Chrysobothris blanchardi Horn. 
The distribution of Chrysobothris blanchardi was reported 
by Horn (1886, p. 94) as Massachusetts, District of Colum- 
bia and Lake Superior region. Blatchley (1910, p. 791) 
records specimens from two counties in Indiana. This 
species has been recorded as a borer in white pine in Massa- 
chusetts by Blanchard (1889, p. 31) and as occurring “ on 
scrub pine” (Blatchley, 1910, p. 791). Blanchard’s data 
was derived from specimens actually cut from white pine 
during July and August. 
Chrysobothris blanchardi was obtained only from the 
branches and tops of larch. The eggs are laid under the 
bark of weakened, dying or recently dead trees. The larval 
burrows are rather long and flattened in cross section, but 
considerably narrower than in several of the sister species, 
including those mentioned later. Although there is much 
variation in the burrows, yet it is usually true that at first 
the larval mine is lkely to be longitudinal and nearly 
straight, or at most only wavy in its course, while that made 
by the nearly full-grown larva later is hkely to be very tor- 
tuous, often crossing and recrossing its own former path. 
(Figs. 23, 24.) The entire burrow is tightly packed with 
frass and that derived from the bark and from the sapwood 
is often so arranged as to form alternate dark and lght 
strie, as shown in Fig. 25. The material for this is derived 
by the larva alternatingly excavating from the bark and from 
the sapwood, and this is arranged to form the curved striz by 
the abdomen of the borer, which is habitually curved, the 
loop being pressed against the packed frass to afford leverage 
while the larva is rasping off the woody fibres. Pupation 
takes place in a shallow chamber extending longitudinally 
with the wood fibre and lying just under the surface of the 
