Insects Bred from American Larch 101 
Predators associated include Phyllobenus dislocatus and 
Cymatodera bicolor. The parasites present in the same 
material were Rhyssa lineolata, Pseudorhyssa sp., Eurytoma 
sp., and three species of Doryctes. 
Odontaulacus bilobatus Prov. 
(Det. by S. A. Rohwer) 
According to Bradley (1908, p. 124) this ensign-fly has 
been taken in Quebee and West Virginia. No reference to 
the host of this species was found in the literature, but Hop- 
kins (1893, p. 216) states that the sister species O. abdomi- 
nalis was bred from hemlock infested with Melanophila 
fulvoguttata. 
In larch O. bilobatus was associated with the buprestids, 
Melanophila fulvoguttata, Chrysobothris blanchardi, C. den- 
tipes, C. sex-signata and Anthaxia quercata; the ceramby- 
cids, Pogonocherus mixtus, Neoclytus longipes, Leptostylus 
sex-guttatus; the scolytids, Polygraphus rufipennis and 
_ Lecoptogaster picee ; the clerid Phyllobenus dislocatus ; the 
hymenopterus parasites, Atoreutus astigmus,S pathius tomici, 
Phasgonophora sp., Cheiropachus sp., and Heterospilus sp., 
and the fly Pollenia rudis. Of these the two scolytids, P. rufi- 
pennis and H. piceew; and the parasites Spathius tomict, 
Heterospilus sp. and Cheiropachus sp., emerged the first year 
while the others and O. bilobatus were associated throughout 
two years. Specimens of P. dislocatus were taken from these’ 
limbs of larch both seasons. Of the associated borers it is 
most likely that either C. blanchardi, M. fulvoguttata or P. 
miaxtus acted as host for this parasite, although it is possible 
that the host may have been one of the other flat-headed or 
round-headed borers. 
Spathius tomici Ashm. 
(Det. by S. A. Rohwer) 
This small bracomid has been reported as parasitic upon 
Dryocoetes [autographus| americanus Hopkins in spruce 
bark by Hopkins (1893, p. 145) and upon Pityogenes 
