NATURAL ENEMIES: PARASITIC INSECTS. 145 
Here also the percentage of parasitism varies with the different 
lots, but is less than in case of material from Washington. The 
average parasitism for the season was 1.69 per cent, approximately 
the same as that from Washington. This would be of but little im- 
portance as affecting the abundance of the curculio. 
At Barnesville, Ga., in 1910, data of the same character were ob- 
tained from all the larve infesting the fruit on a block of 31 Elberta 
peach trees during the season, as shown in Table LXX XIV. These 
data show a considerably higher percentage of parasitism and also a 
larger percentage of larve transforming to adults, with a correspond- 
ing decrease in the proportion of larvee failing to produce either para- 
sites or beetles. This was doubtless due to a more favorable condi- 
tion of the soil in the rearing cages. 
TaBLE LXXXIV.—Record of emergence of Sigalphus curculionis for season, Barnes- 
ville, Ga., 1910. 
e Percent- | Percent- 
ue aye Number age age 
TotNo Date larve entered | Number ne eile of beetles| of larvee | of larvee 
cure soil. of larve. ae _ arisite eemcne trans- unac- 
sa 8 epic ing. forming | counted 
8- : to adults. for. 
Mey 228 se ee 77 20 25.97 28 36.36 37.67 
May 4-655 occ nme 457 96 21.01 182 39.82 39.17 
May 7-9 (22: a2 566 47 8.30 276 48.76 42.94 
May L0Ss 252-0 5. 240 11 4.58 105 43.75 51.67 
May itt esse 209 8 3.83 109 §2.15 44.02 
Nh pe 272 11 4.04 170 62.50 33. 46 
Mays eS ee 159 4 2.52 117 73.59 23.89 
May 14-16......... 192 4 2.C8 145 (9. 52 22. 40 
May 17-19... 5-2. 142 3 2.11 101 (Alyals} 26.7 
Maiy20-23". 022.2. 2 190 i 3.68 108 56. 84 39. 48 
May 24-26......... 66 1 1.52 45 68.18 30.30 
eel May 220-2 e oe 33 OM eer eee 21 63. 64 36.36 
-| May 30-June 1.... 28 ORS sees 13 46. 43 53.57 
Wine '2-8.- = 552-5 - =< 26 1 3.85 15 57.69 48. 46 
June 9-Aug. 9..... 258 Olleseescest = 133 51.55 48. 45 
May 2-Aug. 9...-- 2,915 213 7.31 1,568 53.79 38. 90 
Observations on miscellaneous lots of larve at Youngstown, N. Y., 
in 1905 (see Table LXXXV) show a much higher percentage of 
parasitism, the average for all lots being 18.66 per cent parasitized. 
These records, however, are not made from proportionate numbers of 
larve throughout the season. The parasites were perhaps at their 
greatest abundance during the period under observation. 
TaBLeE LXXXV.—Record of emergence of (Sigalphus) Triaspis curculionis from miscet- 
laneous lots of larve, Youngstown, N. Y., 1905. 
Date 
fs < Number of | Percentage 
Lot No. peal Nvaber of) ‘Sigalphus | of larva: 
=H ; 3 emerging. | parasitized. 
Ue oe loge ce bo eot ee eine oe oe --| June 27 10 1 10. 00 
ee ee ee eee non ale a oacaceto <a telc cs hone cmacesee Se -Gl ees 40 8 20. 00 
Ge ree oa onc 2 crea nies vp ae teaa ans =< becca ea ercisties June 28 55 15 21.27 
Linens i5- 55 Se. Seas oe June 29 80 20 25. 00 
Toe Lec SEAS See OURO SS Oe ee eee ea a ee SeedOsee 20 8 40. 00 
Ul och eee oe eae EAC ee seo se ae 150 35 23. 33 
Tensdeck Seg: SSeS ee eeee ae. Semen July 1) 150 20 13. 33 
Ce ott het a ee eee eee Serer July 2 126 15 11.90 
3 eee skee Son8 See Ee Se ES, - oe Oe ee July 3) 135 20 14. 81 
Ue: echupspidétee |) eel ii es SS eee eee July 7/| 70 14 20. 00 
AG, oa ob ee TORRE a ee oe eh del (ee ee 836 156 18. 66 
17262°—Bull. 103—12——10 
