THE PEACH-TEEE BARKBEETLE. 101 



Description of pupa about 3 days old. — Length, 2.5-2.GG 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 i>arts 

 (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 rugidosu-s and Pldoiotrihus limlnaris 

 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. rur/i/Iosns, 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. 



.Vo. 1. — Used 16 trees. One part by weight of lime ; 2 parts by weight of 

 cement; milk used to mal^e a stiff whitewash and applied with a broom to i)6 

 trees, o2 of which were used in experiment No. 2, witli the addition of manure. 

 Thirty-two more were used for exi)eriment 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 0. 



Date of application, April 9, 1908. 



yo. 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. .'/. — Used IG trees of experiment 1, making a second ai)plication. 



First application, April 9, 1908; second application, ,7uly 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. 



