PLATE XXX 



Fig. I. — Agrilus vitiaticolUs: Larva (c), pupa (6), and adult (a) of the apple root 

 borer in the pupal cell. Slightly enlarged. Original. 



Fig. 2. — Xylophruridea agrili, a common parasite of the apple root borer. Greatly 

 enlarged; natural size, i8 mm. Original. 



Fig. 3. — Section of trunk of young service tree, showing below the white egg and 

 above the exit hole of the apple root borer. Natural size. Original. 



Fig. 4. — Xylophruridea agrili: LarviE of the parasite; one feeding on the larva and 

 the other in the pupal cell of its host. Enlarged about one-third. Original. 



62697°— 14 8 



