104 College of Forestry 
Astoreutus astigmus Ashm. 
(Det. by S. A. Rohwer) 
No references to this insect were found in the literature 
at hand. We bred but one specimen and it emerged from 
the limbs of Tree I at about the same time as Melanophila 
fulvoguttata, Chrysobothris blanchardi, C. sex-signata, C. 
dentipes, Anthaxia quercata, Pogonocherus mixtus, Neocly- 
tus longipes, Leptostylus sex-guttatus and Phyllobenus dis- 
locatus. The bark-beetles Polygraphus rufipennis and Hccop- 
togaster pice emerged in some numbers the preceding 
summer and one specimen of the latter emerged the same 
season (being derived, perhaps, from the brood of a second 
generation started in the cages the previous summer). No 
definite statement regarding the exact relations of A. astig- 
mus can be made but it is evident that it is more likely to 
have been parasitic upon one of the two-year forms — 
buprestids or cerambycids. 
Other insects derived from the same material include 
Phasgonophora sp. and Odontaulacus bilobatus, two parasites 
emerging at about the same time, and Cheiropacus sp., 
Heterospilus sp., Spathius tomict and Pollenia rudis which 
emerged a season earlier. 
Spintherus pulchripennis Cwfd. 
(Det. by S. A. Rohwer) 
Hopkins (18938a, p. 227) reports an unidentified species 
of this genus as parasitic upon Polygraphus rufipennis in 
spruce bark. Our specimens from larch were obtained from 
one tree only (Tree X) where they were associated with the 
borers — Polygraphus rufipennis, Eccoptogaster picew, Phy- 
matodes dimidiatus, Serropalpus barbatus, Urocerus albi- 
cornis and Sirex abbotu. This species emerges during the 
early season at the same time as P. rufipennis and H. picee, 
upon one or both of which it is doubtless parasitic. 
The predator Phyllobenus dislocatus, the hymenoptera 
Spathius tomici, Spathius sp., Rhyssa lineolata, Doryctes 
sp., an unidentified ptermalid and the fly Medeterus were 
also bred from the same lots of material. 
