Insects Bred from American Larch 105 
Eurytoma sp. 
(Det. by S. A. Rohwer) 
A number of species of this genus have been found by 
Dr. Hopkins to be parasitic upon the larve of various scoly- 
tids and other wood and bark-inhabiting insects (Hopkins, 
1893a, p. 324; Ashmead, 1894, pp. 323-327). 
Specimens of this small eurytomid were bred from two 
larch trees (Tree III and Tree IX) where it was associated 
with the borers Polygraphus rufipennis, Phymatodes dimi- 
diatus and Leptostylus sex-guttatus, all of which emerged at 
about the same time. From Tree IX, Neoclytus longipes was 
also bred but it emerged a year later than the parasite. The 
only insect in common between these two lots was P. rufi- 
penms and its burrows were also the only ones which con- 
tained cocoons from which so small a parasite would be 
likely to come. It is very likely that Hurytoma sp. is a 
parasite upon this small scolytid. The adults emerged in 
the outdoor cages June 5 and July 28, 1916. Other insects 
bred from the same material are Phyllobenus dislocatus, 
Cymatodera bicolor, Rhyssa lineolata, Pseudorhyssa sp. and 
several species of Doryctes. 
Phasgonophora sp. 
(Det. by S. A. Rohwer) 
The only reference to the host of a species of Phasgono- 
phora we found is that of Smith (1909, p. 649) in which he 
states that P. sulcata has been bred from Papilio sp. Our 
specimens were bred from larch lLmbs which had been con- 
fined since the spring of the preceding year. They were 
associated with the following two-year forms and emerged 
at about the same time: Melanophila fulvoguttata, Chryso- 
bothris blanchardi, C. sex-signata, C. dentipes, Anthaxia 
quercata, Pogonocherus mixtus and Leptostylus sex-guttatus. 
This species is probably parasitic upon C. blanchardi and 
possibly upon others of the associated borers as well. 
Other insects bred from the same source include Phyllo- 
benus dislocatus, Cheiropachus sp., Atoreutus astigmus, 
Heterospilus sp., Spathius tomicit and Pollenia rudis. 
