151 



usuiilly just at the surfaw of the soil. A few (hiys after its cocoon is made, 

 the borer changes to a pupa, in whicli stage it remains for about three weelis. 

 From the pupa, the moth emerges, thus completing its life cycle in a year, 

 fully ten mouths of which are usually spent as a borer in the tree. 



(Fig. .:.!.) 

 (n) female; (1)1 male: (ri larva; ('/. f) female and male pupj? of cocoon. 



The dates at which they hibernate and hatch out will vary with the 

 locality and climatic conditions. 



When fully grown the larvie or "borers" are aliout an inch in length, of 

 a light yellow colour. 



California Pe.wii Tree-Borer (l^diiiKiiiiii I'acifica. IUley). 



Description. — Fciiialr differs from the Eastern species, in not having any 

 yellow markings upon the abdomen. The head and eyes are jet black ; thorax 

 and abdomen are bluish-black, with slight bronze tint: edges of abdominal 

 segments are marked with light blue; forewings are black, opaque, and in 

 certain lights have a beautiful greenish lustre, tips are fringed: posterior wings 

 transparent, with six black veins, narrow margin of bho-k. and lower edge 

 with purple fringe ; antenna; and legs black. 



Male. — Head, eyes, thorax, and abdomen bluisli-black : forewings trans- 

 parent, with a black blotch across the veins: extremity of wing black, with 

 purple fringe; posterior wings transparent, with narrow black border: lower 

 edge of wing furnished with purple fringe. Antenna' black, and uiion inner 

 edge are two rows of very minute hairs: legs black, with light yellow hairs at 

 the joints between the femur and tarsus. I-:xpanse of wings one and one- 

 cpiarter inch. 



Jlahit. — The female moth deposits her eggs on the bark, generally near 

 the surface of the ground. The larv». soon after hatched, burrow into the 

 bark and work downwards, and as they increase in size penetrate deeper, 

 devouring the inner bark and sapwood, causing the tree to exude gum. This 

 spec-ies has more of a tendency to work vertically, still where the borers are 

 present in numbers the death of the tree is certain. I have recently examined 

 apricot and peach trees where the entire bark around the collar was 

 destroyed by this species. 



