•M) 



;iti(l ;i tew on uf.Mss. (tclohcr .")(i. I'^iirllicr iiicrcnsc (tii wlicnt :iii(l lii'ow- 

 iiii;corii, ;iii(l sonic w ;iii(l('riii!;(>\ cr I tic u,r;iss. A \-cr\- lew on I lie |tursl;iiic. 

 ()ctol)(M' ."11. Moi'c lice oil \\li(':it ;iii(l corn, Imt no iiici'casc on piirshinc 

 or ji'i'ass. No\-cnil)c!' I. \\"nii;lcss spcciincns disposed to wander I'rom 

 thoir food planls. \o increase on i;rass or pui'slaiuv \\'ini;-ed t'einalrs 

 criislied, are t'oiind willi li\int;- yoniiii-. Nox'cnihcr 'A. Corn and wheat 

 continue fairly well slocked. \'ery few on i;rass and purslane, .\o\-eni- 

 her ."). More \\inii,(>d l^aiialcs, mostly in the top of the .!;lass. W'inii'iess 

 ones fo\V(M" than Satui'day. Noxcniiier (1. ( )ne additional youiiii on(> on 

 gniss; iilsi) soni(> winii;ed I'lMnales. Corn and wheal alioiit as l)et"oro 

 except for a sli^'ht incn^ase of winuiMl spcciincns. Noxcnilici' 7. (irass 

 witli only one win^cHl louse u|)on it. Wheat and corn with many wiiii^ed 

 and wiiiij;U'ss and younu,'. Nox'cmhcr S. .Miout the usual nuinher of 

 winded plant-lice in the lop of the <;iass, with urass eiilirely dcsci'lcd 

 and corn ahiiosi so. Wheat more tliickly slocked than pre\iously. 

 Noveinber \). Non(> on corn oi' i^i-asis; a few remaininii on the wheat. 

 Nov(MnlHM' 10. Mark(>d d(M'r(>as(> in nuiuhers. No\(Mnl)er 12. Only two 

 wina;(Ml specinuMis, and \-ery f(wv winuiess. None on grass oi" corn. 

 NovcMnhor i;>. The only liviiii;' sptM-inuMi remainiuii; is a winij;e(l louse. 

 Tlio whol(> colony had thus disappeared from all thes(> plants within a 

 month. Wheal and corn had both sujiported lliem for this period, 

 with th(> production (^^ numerous youiiii;, hut non(> had hred on apple, 

 gi-ass, or purslane with llu> exci^plion of a siu!;l(> yomiii; oiu^ horn on 

 fi'rass. 1m)I" a rc^pelilion of this experiment this 1)(>1I u;lass was restocked 

 with plant-lice obtainetl from soriihum in soulluM'n Illinois November 

 II. .November 15. Lice have ,ii:oiu> from soi-^hum to wheat, corn, and 

 I2;rass. Nov(Mnb(>r Hi. llaxc almost all \c\'{ [\\c i;rass and i;'on(> dcH'pcr 

 into tlie leavers of corn and wheat. Novemlier 17. Lice on com and 

 wlu^it l)ut none on iirass. No wing-ed ones seen. Tem[)erature of <i-reen- 

 hous(\ •If' i''ahr. No\-emb(M- D. Lic(> dyini;' or disappeariiii;-. ( )ne 

 winii-ed specimen seen this luorninii', the only oiu* since sori;luim was 

 introduciHl. Most of the lice are on {\\v corn; a \(M'y few on i^rass. No- 

 \-ember L'l. SextM'al wini;(Hl specimens. Corn and wh(>at fairly wt>ll 

 slockcMl. b'rom Nov(Mub(>r '2'.> to the 27th the plant-lici> diminished 

 rapidly, and on the latliM- datc^ w(M-(> practically all g-oniv 



l^.vjHritncnt ->'. Hnjiui Orlohcr ■!■'>. tn'lh u'licat aloiic, inidcr hell (ilasa. — 

 (^n the iOtli of Hecember the insects riMiiainiiiii were transferred to 

 another pot. containinii' youni; corn and wheat. (October 27. .V tew 

 lice on wheat and on ,i;,rass. (>ctob(>r 29. .\ fiwv on tlu> wheat, both 

 winij,(vl and wini>;less, ha\e l(>ft their food and are collected in the top 

 of tlu> bell ".'lass. A numb(M' of cast skins on lli(> e.arlh beneath. No- 

 \-ember 1 aii'l ;■>. Increasinii" numbcM' of yoniii;'. Nd\'cmb(>r "). Uoth 

 wingcHl and wing-less spcn-imens. NovcMubcn* S. (.^)uile a numlxM- of 

 wingless on all parts of the wheat, and the winged individuals have 



