THE RED SPIDER ON COTTON. 45 
TasBLeE XIV.—Larval period of Chrysopa rufilabris. (Individual No. 1.) 
WEINBLDIEG 5 ey cried at fas eS UG TN 1 UH a a ae ON AN Pe ee AUS YS 
TUDE. 8 Lies bg CAR EEN Ec, Sie Oe eee 2 aA ae! RO Aug. 22. 
emmy eTIOC WN ) Swern ike aaa Se a Oo Salle de 18 days. 
No. 4 of Table XVI was the only larva which was reared through 
from egg to pupa, and, as will be seen, the entire mite consumption 
for the individual was also secured. The larval period is 18 days, 
which is a trifle shorter than Davidson secured from his data based 
on 2 individuals. No attempt was made to determine the duration 
of the larval instars, but incidentally the length of the first instar was 
established as about 4 days. Table XV presents statistics on the 
pupal stage of Chrysopa rufilabris. 
TaBLE XV.—Records of the pupal period of Chrysopa rufilabris, Batesburg, S. C. 
| 
Indi- Average Indi a) | Average 
vidual |Pupated.| Issued. alee pupal vidual | Pupated.| Issued. yupet pupal 
No. Pp * | period. No. Der Fi period: 
Days. Days. Days. Days. 
1| June 9] June i7 8 8 | July 26} Aug. 4 9 
Dil edossasapasdouss. ¢ 8 |} 9} Aug. 3] Aug. 15 12 
3] July 8] July 15 7 10 | Aug. 14] Aug. 21 iG 
4|July 10] July 17 a 8.6 11 |} Aug. 18 | Aug. 25 7 8.6 
5 | July 22} Aug. 2 11 12 | Aug. 25 | Sept. 2 8 
6 | July 23] Aug. 1 9 13 | Sept. 3 | Sept. 16 13 
Ga nalys 9243 ee doses: 8 145 | Septs (On |he-doncae: 7 
| 
From these 14 pupal records it is seen that the duration of the 
transformation period at Batesburg varies from 7 to 13 days, with 
8.6 days as the weighted average. Thus, exclusive of a possible 
preoviposition interval, we find that the cycle of the chrysopid from 
the deposition of the egg to the issuance of the adult is about 30 days, 
approximating 4 days for the egg stage, 18 days for the larva, and 8.6 
days for the pupal stage. In the Southeast there are probably four 
generations of lacewing flies in a season. 
TaBLE X VI.—Rate of destruction of red spiders by the larva of Chrysopa rufilabris. 
Red spiders consumed. 
Larva Hatched. 
No. Ist | 2d 3d | 4th } Sth | 6th | 7th | 8th | 9th | 10th | 11th | 12th 
day.| day.| day.| day.| day. | day.| day.| day.| day.| day.| day.| day. 
1914 
1 Aiea ale OU p US de beey HE SSB a CLA) ten eee epg NS Se Pade | pclae ae sia ea re) [ston ees atalltavecu ava‘) [alloca talon ay Suz uat fel [ep tonne 
Dit Dok aialiyallSerareees ine See 31 32 33 34 48 ABS | eeiyessn CG) Fra al a epee eae 2d 
Ee Nal ec eee GOL ae eee 26 16 43 30 51 40 SA meee esa: CED Ys An emccte se ase 
gee seau BASU OME Way Silo aves ats 9 28 14 29] 30 37 26 41 39 48 59 63 
Eis a tage IXTUIRS AN a eRe 24 37 eat WAH) ae ie i i PU a em Gey Fare Ne ae 
Gaara Tully ope eer we 19 29 35 39 39 17 SOASNCA Gee ere acne Bee 
a ave UCU NO ess doasase 2A 27 20 18 33 26 21 a aa C2 Naas NR hee 
Bie Me Taille UE ee 3a CN | oF | SN a ee Cae 47 62 58 66 
CT RN i a Oa epee ee BNI I ND EUTSIST Pa LL a Fe 90) 59 69 
NO ae AEG IDRE 1 SEN Ms or ic alr ee alae ee een eet Sell acer eal sod Oeulaateraln raeanl|og oc 
Tha eens ANGIE WE Grs 5 Hoole Mey sel ee Hue |e 8 OE TSN Os i I et a ol (ais eieeiel loa banal cae de 
We see PANU RUAN Gee opm Serevent aml est | Cle ml el 2 lie BA US oo) polchcte ie |e ole atecelfctetsie|s\= |= = l= eines seme my seatel = 
Wes cag ae PATER Loaemmne ee [enki Tuner PA avn mllenin cs lia ee Ciclo Uigratalieys claiwiell aia) che) cillatelalaja all's o/<!wie\ai|ntaai=) fain afaticse 
1 Dead. 5 Collected as two-thirds-grown larva. 
2 Lost. 6 Collected as mature larva 
3 Entangled. 7 Collected as large larva. 
4 Collected as half-grown larva. 
