Insects Bred from American Larch 103 
species, were bred from larch material. All of them 
were associated with Phymatodes dimidiatus and probably 
emerged from cocoons found in the burrows of this ceram- 
bycid. Oother borers associated were Leptostylus sex- 
guttatus, Serropalpus barbatus, Polygraphus rufipennis, 
Eccoptogaster picee, Urocerus albicornis and Sirex abbotit. 
Other associated insects were Phyllobenus dislocatus, Cyma- 
todera bicolor, Rhyssa lineolata, Pseudorhyssa sp., Hurytoma 
sp., Spintherus pulchripennis, Spathius sp., and Odontau- 
merus canadensis. ‘The adults of Doryctes emerged in the 
cage between May 25 and June 5. 
Heterospilus sp. 
(Det. by S. A. Rohwer) 
Species of this genus have been recorded by Ashmead 
(1896, p. 214) as parasitic upon a coleopterous larva (from 
Dr. A. D. Hopkins’ records) and by Viereck (1916, p. 238) 
from the galls of Hurosta solidaginis. 
The species here in question came from larch June 2, 
1916. It was bred from limbs of Tree I, emerging at the 
same time as the adults of Polygraphus rufipennis and 
Eecoptogaster yicew. It is nearly certainly parasitic upon 
the first of these scolytids and probably upon both of them. 
It was bred from the same material as the various buprestids 
and cerambycids already recorded as characteristic of the 
larch limb association, but emerged a full season ahead of 
these and is therefore nearly certain to be parasitic upon one 
or both of the scolytids mentioned above, which were emerg- 
ing at the same time. Other insects associated and emerging 
at about the same time are the clerid Phyllobenus dislocatus 
and the two hymenoptera Spathius tomict and Cheiropachus 
sp. Additional parasites emerging a year later are listed in 
the table on page 38. 
