II Mill III II Mill Mil llll 
THE POTATO TUBER MOTH. 
33 
PARASITES. 
Parasites vary in effectiveness. During 1914 Habrobracon johann- 
seni (fig. 16) was the most effective, and the following list probably 
gives them in the order of their importance for that year: 
Habrobracon johannseni Vier. 
Chelonns shoshoneanorum Tier. 
Sympiesis stigmatipennis Girault. 
Campoplex pJithorimaeae Cushm. 
Bassus gibbosus Say. 
During early 1915 Dibrachys clisiocampae Fitch was discovered, 
and while not so well distributed, it seems to be well fitted to be an 
Apantales sp s fChttn. No. 2230 07 ). 
Microgastersj). (Chttn. No. 2230 08 ). 
Nepeira benevola var . fuscifemora Cushm. 
Zagrammosoma flavolineatum Cwfd. 
Fig. 16.— Empty cocoon of the potato tuber moth (large one) and cocoons of its parasite, Habrobracon 
johannseni. Much enlarged. (Original.) 
effective enemy. Ranking the parasites in the order of their im- 
portance for 1915 would give them the following order: 
Dibrachys clisiocampae j 
Sympiesis stigmatipennis i ^portLSe^ 
Campoplex pJithorimaeae] 
Apanteles sp. (Chttn. No. 2230 07 ). 
Habrobracon johannseni. 
Chelonus shoshoneanorum. 
Bassus gibbosus. 
Microgaster sp. 
Nepeira benevola var . fuscifemora. 
Zagrammosoma flavolineatum. 
The last four species in each list were relatively unimportant 
during both years in the districts from which material was collected 
for study. These were as easily reared in confinement as most of 
the others, and there seems to be no reason why they should not be 
important equally with other species which oviposit in the tuber 
larva where it occurs as a leaf -miner. 
