PARASITES OF LARGER BROWN-TAIL CATERPILLARS. 



303 



Fig. 73. — Eudoromyia magnicornis: Adult female, with front and side 

 views of head at right. Much enlarged. (Original.) 



as satisfactory, so far as known, as those attending the colonization 

 of Pales and Zygo- 

 bothria, and it is 

 hoped that it may be 

 recovered in the 

 course of 1911 or 

 1912. It is also 

 hoped that a large 

 number will be im- 

 ported in 1911. 



Masicera sylvatica 

 Fall. 



This tachinid ap- 

 pears not to be un- 

 common as a parasite 

 of the brown-tail 

 moth in Italy, but 

 has not been received 

 from other countries 

 in more than the most 

 insignificant num- 

 bers. Not enough have been received to make anything like colo- 

 nization possible, and it is one of the species which it is hoped to 



receive in 1911. 



Eudoromyia magnicornis Zett. 



This (see fig. 73) is the most distinc- 

 tive of the tachinid flies parasitic upon 

 the brown-tail moth, and the only one 

 among the parasites of either the gipsy 

 moth or the brown-tail moth which has 

 the habit of depositing its active larvae 

 upon the food-plant of its host. This 

 habit was first discovered by Mr. 

 Townsend, who gives an account of 

 the manner of the discovery in Techni- 

 cal Series VI, part 12, of this bureau, 

 from which the accompanying figure 

 (fig. 74) was taken. 



It is another of the group of tachinid 

 parasites which appear to be southern 

 rather than northern in distribution, 

 on account of which it has been found 

 impossible to secure a sufficient number to make adequate colonies 





Fig. 74. — Eudoromyia magnicornis: a, First- 

 stage maggot attached to leaf, awaiting 

 approach of a caterpillar; 6, mouth-hook 

 of maggot, a, Greatly enlarged ; 6, highly 

 magnified. (From Townsend.) 



