THE PEACH-TREE BARKBEETLE. 101 
Description of pupa about 3 days old.—Length, 2.5-2.66 mm.; width at widest 
part, 1.08-1.11.mm. Body uniformly white, except along sides of abdomen, 
which may show faint yellowish tinge. Eyes reddish brown: mouth parts 
(interior) faintly brownish. Abdomen ending in two lateral, whitish, minutely 
spinulose, brown-tipped horns. 
PARASITES. 
At the present date (December, 1908) no parasites of this species 
are known. Where Scolytus rugulosus and Phlewotribus liminaris 
bred in the same trees the usual parasites of S. rugulosus were found 
in great abundance, with a corresponding decrease in the number of 
adult S. rugulosus, while P. liminaris came out in numbers corre- 
sponding to the larval chambers. Efforts were made to rear the para- 
sites upon limbs full of P. liminaris, but without success. Many 
minute mites—which, however, are not parasites—are found in and 
about the burrows and clinging to the hairs about the legs of the 
beetles and the ventral side of the thorax. They live on the excre- 
ment of the beetles and decayed matter in the burrows, simply using 
the adult beetles for the purpose of being carried from one place to 
another. 
EXPERIMENTS WITH REMEDIES. 
A list of the general experiments and a summary of the results is 
given below. Each experiment was made on a plat containing the 
number of trees mentioned. 
No. 1.—Used 16 trees. One part by weight of lime; 2 parts by weight of 
‘cement; milk used to make a stiff whitewash and applied with a broom to 96 
trees, 32 of which were used in experiment No. 2, with the addition of manure. 
Thirty-two more were used for experiment No. 3, with an application of com- 
mercial fertilizer. Sixteen trees of each plat were given a second application, 
forming experiments Nos. 4, 5, and 6. 
Date of application, April 9, 1908S. 
No. 2.—Used 32 trees of experiment 1. Barnyard manure spread in a 
7-foot circle about each tree, to get value of fertilizers. 
Date of application, April 9, 1908. 
No. 3.—Used 32 trees of experiment 1. Commercial fertilizer applied in a 
7-foot circle about each tree. 
Cement applied April 9, 1908; fertilizer applied May 7, 1908. 
No. 4.—Used 16 trees of experiment 1, making a second application. 
First application, April 9, 1908; second application, July 3, 1908. 
No. 5.—Used 16 trees of experiment 2. making a second application. 
First application, April 9, 1908; second application, July 7, 1908. 
No. 6.—Used 16 trees of experiment 3, making a second application. 
First application, cement, April 9, 1908; fertilizer, May 7, 1908. Second ap- 
plication, July 3, 1908. 
No. 7.—Used 2 pounds fish-oil soap per gallon of water (dissolving soap in 
boiling water) for first application. Used 1 pound of soap to 6 gallons of water 
for second treatment. Twenty-four trees treated, 16 to be used for experiments 
8 and 9. 
First application, April 10, 1908; second application, July 7, 1908. 
