Insects Bred from American Larch 21 
was placed in a breeding cage and the following specimens 
were bred from it: The cerambycids Phymatodes dimidiatus 
and Leptostylus sea-quttatus; the clerids Phi yllobaenus dis- 
docatus and Cymatodera bicolor which were preying ‘upon 
P. rufipennis principally; six hymenopterous parasites in- 
eluding the two large pimploid forms Rhyssa lineolata and 
a new species of Pseudorhyssa, both of them apparently para- 
sitic upon Phymatodes dimidiatus, and four smaller forms; 
three species of Doryctes (all probably new) and Lurytoma 
sp. Of these the three species of Doryctes are probably 
parasitic upon P. dimidiatus and the latter on P. rufipennis. 
Tree No. IV was a tree which was still living but much 
weakened. One of the larger roots which was exposed and 
free of the ground for several inches had been dead about 
two years (killed 1914). The bark was rather thick and 
still adherent, although the wood was beginning to decay. 
Examinations of this root in the field showed the presence 
of adults of a scolytid — Dryocoetes americanus — and the 
larva of a cerambycid which later proved to be Leptura 
vittata. 
This root was removed without felling the tree and was 
confined in a breeding cage. During the summer two adults 
of Leptura vittata and two specimens of a small fly — 
Phorbia fuscipes — were taken from this cage. 
This material was left in the breeding cage out of doors 
until November 2, when it was brought in and gone over 
thoroughly. The bark was removed, disclosing the burrows 
and dead adults of Dryocoetus americanus, also a living 
¢lerid larva of unknown species. Deeper in the wood were 
found the larvae of Leptura vittata and the adults of the 
small weevils Dryophthorus americanus. The sample of root 
was placed in a tight storage box, and later gave rise to one 
specimen of L. vittata. This was found dead January 13, 
1917, and the exact date of emergence was unknown. How- 
ever, from the general date of its appearance in the labora- 
tory it would have appeared under natural conditions in May 
or early June. 
