THE PEACH-TREE BARKBEETLE, 101 



Description of pupa about 3 days old. — Leugtli, 2.5-2.G0 rum.; width at widest 

 part, l.OS-1.11 nun. Body uniformly wliite, c'.\cei)t along sides of abdomen, 

 wliicli may show faint yellowish tinge. Eyes reddish brown; mouth parts 

 (interior) faintly brownish. Abdomen ending in two latei'al, whitish, minutely 

 spinulose. brown-tipped horns. 



PARASITES. 



At the present date (December, 1908) no parasites of this species 

 are known. Where Scolytus rngnloHus and Fldivotrihus limiiuiris 

 bred in the same trees tlie usual jjarasites of S. rugulosns were found 

 in great abundance, with a corresponding decrease in the number of 

 adult S. riir/idosjts, while P. Ihninaris came out in numbers corre- 

 si)onding to the larval chambers. Efforts were made to rear the para- 

 sites upon limbs full of P. liminaris, but without success. Manj^ 

 minute mites — which, however, are not parasites — ^are foimd in and 

 about the burrows and clinging to the hairs about the legs of the 

 beetles and the ventral side of the thora.x. The}' 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. 



Xo. 1. — Used IG trees. One part by weight of lime; 2 parts by weiglit of 

 cement; millc used to make a stiff whitewash and applied with a broom to OG 

 trees. 32 of which were used in experiment No. 2, with the additi(m 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, 190S. 



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, 190S. 



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 api)lied :May 7, 190S. 



No. /{. — 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 IG 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 G gallons of water 

 for second treatment. Twenty-four trees treated. 16 to be used for experiments 

 8 and 9. 



First a|)plication, April 10. 1908; second application, July 7. 1908. 



