THE PEACH AND PLUM SLUG. 97 
the cold weather of April, and represent the result of abnormal 
conditions. 
Unlike its congener, the pear slug, the larva does not eat its 
exuvilum. 
The escape from the exuvium is made through an opening at the 
head end, the larva simply crawling out of its old skin and leaving it 
as a narrow line of slime on the surface of the leaf. 
Immediately after molting the larve very freqeuntly wander away 
from the leaf on which they have been feeding to another, sometimes 
2 or 3 feet distant. 
During the first four instars the larva is of a peculiar sluglike 
appearance, swollen in front and covered with the slimy secretion 
which hides the segmentation of its body. The head is pale brown 
and the eye spots darker. The body is translucent and the course 
of the alimentary canal can be traced by the green food within. On 
molting for the fourth time, however, it loses its slimy coating and 
appears as an opaque, yellowish, caterpillar-like larva (fig. 24, d), in 
which the segmentation can be distinctly seen. It is from five- 
sixteenths to three-eighths of an inch in length. 
During the last molt the larva deposits several pellets of excrement 
within the exuvium. 
Tables IL to V show the data obtained on the duration of the 
different larval stages, and Table VI gives the data for the total 
feeding period. 
TaBLE II.—First larval period of the peach and plum slug, Tallulah, La., 1910. 
‘ oe Number First 
Lot No. | mae Bre Ot ot Hindi- | larval 
5 ‘| viduals. | period. 
Days. 
BIS () rapes ae arco so ei oe oars Se ae ISAS SE Em ha Serres setter Aug. 14 | Aug. 15 6 1.0 
NTETEIEpepeprare rain tae nro here ay Say Sl Age Ey a Ne arene eaion Aug. 16 | Aug. 17 3 1.0 
ND. 2s ode Gain aco SSE COD RS BOE oat IE netor Daa Coe BER ER SARA ena CE GOzese Aug. 18 3 2.0 
1B eco oct See See ce ice nr ee pe eee een ig Se | Sept. 21 | Sept. 24 D 3.0 
iW eee ee OB SR ate rin Ree So ee eee eee cee eee oe Bea | Apr. 9 | Apr. 11 |% 10 2.0 
SILT G epee eae eer et a ee ape NO ES et cise Apr. 13 | Apr. 15 5 2.0 
TIERS oon FRR Pe ae et ae ype Se Bde Re Ser eee een Seer | Aug. 25 | Aug. 27 4 2.0 
TOE cok sae ee ae ce SRR Le) 81 0 aU ee | Sept. 20 | Sept. 24 1 4.0 
Motalhandtavieragesee = que cee mines aomita ceils as iej</ aaa stasiner | See cetmine = |seeteoereeis 34 1.9 
TaB_eE II1.—Second larval period of the peach and plum slug, Tallulah, La., 1910. 
Date of | Date of | Number | Second 
Lot No. first second | ofindi- larval 
molt. molt. | viduals. | period. 
Days. 
N28 Fe oe hes, 2 roan cla oe See eRe ee as saosin Saale Seems Sept. 24 | Sept. 26 2 2.0 
DUZER i oon lc 3 Sein ie SCO Se tn asain b stara/aeesTe tarts Aug. 27 | Aug. 29 5 2.0 
102!) Se eer ne a Se Se oe ene pee eee ee Sept. 20 | Sept. 23 7 3.0 
Sept. 21 |...do..... 20 2.0 
DNS SS so a= She o3 oases ate SE Oe I Ch cemocc a Saad Sept. 24 | Sept. 26 1 2.0 
Motaliand average. ce. me sacee meee eeeeeees leis omicaslscca|osecs ccaccloaececm sins 35 2.2 
