li)07] (lIRAULr AND ROSENFEIJ) — LEPTINOTARSA DECEMUNEATA 
53 
Table III. Duration of larval in.'ilar.s-. 
Ijot No. Date of 1st Eo(iy,sis 
No. larva; Hatching Instar I 
2iul Ec.(ly.sis 
Instar 11 
3r<I Mcdysis 
Instar III 
Eritcrcii Soil 
Instar IV 
Slims 
1' 5 P.M., May 26 a.m., .May 29 
2i days 
I’.M., May 31 
21 (lays 
A.M...lnne2 n..M., .lime 5 
23 days 31 days 1 1 1 days 
9 6 A.M., June 16 12-30 p.m., June IS 3 p.m.. June 20 4 p.m. .lune 22 7 a.m.,Ju1.v 1- 
2 days, 6i hours 2 days, 21 hrs. 2 days, 1 hour S dys., l.'i lirs. 15 dys., 1 hr.^ 
Ailditioiiiil rt'C'ords of tlic actual Iciifitli of tlic coiuliined larvtil in.star.s made in 
tlic first two weeks in June, ranired from Hi ilay.s, 5 lionrs to 17 dav.s, 0 hours, the 
reeortls obtained from hut tliree larvae. 
I'ime in .wil prrviou.'i to pupation. Two records of this uive 2 days, 1(1 hours 
as the time spent by the larva in the soil jirevious to pupation. 'I'liLs, of course, 
varies much with the individual, and ive are inclined to think the jteriod somewhat 
longer on an average. 
Eating of eggs in confincincnt hij starved larvae. Whenever egg-ma.sses were 
brought in from the field and confined in the laboratory, the young larvae finding 
no food after hatching, would invariably turn their attention to the yet unhatehed 
eggs in the ina.ss, and commence to feed on them. We have seen the entire mass 
thus destroyed by one or two prematurely hatched larvae. 
The Pup.v. 
De.se.ription. Length, 9.21) inm., average; greate.st width, (1.40 mm., bst abdom- 
inal segment. Broadly ovate, angular, convex above, straight or slightly concaved 
below; naked. Color orange yellow, abdomen, wings, and legs orange, the median 
line of abdomen deeper orange; setae brownish; eyes change from pale to crimson 
and then, after 36 to 48 hours, to orange, with discal surfaces dusky; prothoracie 
tubercles black; a broad ilusky line on dorso-lateral aspect of segments 2 to 5 of 
abdomen, not contiguous to the spiracles; sjiiracles black; tip of cremaster black. 
Antennae in.serted so that at least one-third, the whole, of the basal third, is 
visible from ventral aspect, and from dorsal aspect, its apical third; they cross the 
ba.se of the eyes and proceeding caudo-laterad (ventral aspect), go beneath the femora 
of the first and intermediate jiairs of legs, where they are almost hidden; their tips 
reach to the knees of the intermediate legs. Articulation distinct. 
Elytra large and rather conspicuous, their basal half jilainly visible from ventral 
aspect, and from dorsal aspect, a longitudinal half of their base is visible. They 
* Duplicated in the field. 
2 Actual pupation, 
3 Actual length of the combined instars, including time in soil previous to pupation. 
