THE PEACH AND PLUM SLUG. 99 
an oval cell somewhat less than one-fourth of an inch long in its 
greatest diameter. If the cell be opened the larva will be seen to 
have changed its form considerably. (See fig. 24, e.) It is now like 
a mummy of its former self. It is only about half its original size 
when it entered the soil, has lost the power of locomotion, and is much 
shriveled. This stage may be called the prepupa. Marlatt + terms 
the corresponding stage of the pear slug the ‘‘contracted larva.” 
In this form the insect remains for a period, depending on the 
temperature, of from 5 to 7 days before pupation. Some individuals, 
as in the case of the pear slug, which seem to be set aside to guard 
against any catastrophe which might exterminate the species, remain 
in this condition until long after their fellows have matured, before 
finishing their life cycle. In one case a living prepupa was found 28 
days after the latest adult reared from the same lot of larvee had 
emerged. When the work was finished, on October 20, after cold 
weather had set in, all of the cages were examined. In this examina- 
tion all of the living stages found were in the prepupal condition. 
From this it appears that the species must hibernate in this form. 
EDR), PGiRAY 
(Fig. 24, f.) 
The pupal period varies in duration from 2 to 4 days, according to 
the temperature. The data on the total quiescent period (i. e., pre- 
pupa plus pupa) is shown in Table VII. 
TaBLeE VII.—Quiescent period of peach and plum slug, Tallulah, La. 
Date of | Number} Quies- 
Lot No. ee ee emer- of indi- cent 
“| gence. | viduals. | period. 
Days. 
LORS see i5s PE ME ORE SA Or EE BD CROBE er EOE abo cmon aaa Aug. 23....--|) sept. -2 1 9.0 
Ree eae Ses oan cose Soc ct cece scab asehcemecicedss| Aug. 25.....| Sept. 3 2 9.0 
MUL, 3s ALS eGo RSE S Soe ee ene, Tae any MEE eet | Mayroeet ee May 12 1 9.0 
IPSs on Se Aes Sea Coe a ee a | May 22-29...| May 9 1 13.5 
Reet er one ace saree cicme ccs Seta Mecemeste tebens < Face)! dlhyak eae. July 26 1 8.0 
DU oe oe oases cise a Se SacI Gaee Jai= casts see ecu eeeme eas tacis | July 14-17...) July 23 1 7) 
July 24 1 8.5 
NG AE re feo 2382 oe coos Doe Nan miss eee Sac Seta sees Aug. 12:....| Aug. 19 3 7.0 
Meee mete e on ems eet oretisnc Sonjsans lapse eee ee ceeene | Auge 145. 5 Aug. 22 4 8.0 
ie Aug. 23 1 9.0 
Aug. 18....- Aug. 25 2 7.0 
Aug. 21... -=| sept. 16 1 2 26.0 
Aug. 23-25 ..] Sept. 1 2 8.0 
Sept. 3 7 10.0 
| Aug. 26-27 Rdoe sce 2 7.5 
Sept. 4 1 8.5 
Sept. 5 1 9.5 
HUGG Ree eee see ee rt mene cae e feo S ete Soca wtosas Sept. 10-11.-] Sept. 20 1 9.5 
Sept. 22 1 11.5 
MGtalbande rerage ere cree a aicat wee acncee aac eee ook acct |bce sees sd 34 9.0 
1U.S. Dept. Agr., Div. Ent., Cir. 26, 2d ser., 1897. 
2 This individual held over till the next generation before emerging and is omitted from the average. 
