22 BULLETIN 1487, U. S. DEPARTMENT OF AGRICULTURE 
ophora; species of the coleopterous genus Bruchus; and in the Dip- 
tera, Phytophaga destructor (Say), the Hessian fly. Phillips: and 
Poos (29) found that Eupelmus allyniw French might develop as 
either a primary or a secondary parasite of the joint worm, Har- 
molita tritict (Fitch). The species considered here, which is of Euro- 
pean origin, is recorded as principally parasitic on Cynipidae in 
Europe and probably attacks such species here to some extent. 
Although obtained more or less regularly from collections of Apan- 
teles melanoscelus cocoons, it is usually not a particularly serious 
hyperparasite. Occasionally, however, it becomes very destructive. 
It is a solitary species, so far as larval development is concerned, 
never more than one individual maturing within a cocoon, although 
Fic. 6.—£upelmus spongipartus, female 
several eggs may have been deposited; and in New England it 
passes through not more than two generations, usually only one, 
annually. The eggs are deposited inside the Apanteles cocoon, but 
only occasionally are they placed directly upon the Apanteles larva 
which is resting there. Much more frequently they are found to 
lie just inside the inner wall of the cocoon, firmly held in place by a 
delicate fibrous mass, which must have been deposited by the parasite 
at the time of oviposition, for it can be readily pried loose with a 
needle, coming off with the egg. Phillips and Poos (29) observed 
the same curious type of fibrous structure usually supporting the 
eges of Eupelmus allynii against the inner wall of the host cell or 
puparium. When the adult emerges the same season that the egg 
is deposited the period required for development from egg to adult 
— a 
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