CONTENTS 
PAGE 
Distinguishing characters of the three species of aphids.....................--2+-0-- 683 
The green apple aphis (Aphis pomi DCNGCEE ie Mercere ae y cesar erat att eCe tera ee ny hs aN 686 
SSKVOO PDR ALINY oy. a/OUG SCAR LN ERIE eye etal alesis eel my aansienttiy yates Ont eae au ua eee AY VR 686 
TEED Ga. orate scale Eee EN Oe ET EIEN CAS HEGEL eC EROS TE TICE RRR Wh oT IM ate 687 
IN GHUUIE DIE ISLO Tyger a yee ar Scie eres easy Ccy es eit a NS eR chef Sin ene ata ca eyed le Sl 689 
Eatchingzofcthere ses aoe eis el tenner lw UA mean ane Ly need ete tia LE Re non 690 
Hailurevofathe eggs to hatches i. oF eis. 2 os ee Win shy reusenene Gvbee ott oes 691 
The stem mother...... Lacon sa xing rcee ie oa SRR iO SERY PCs See RUS ON Oner cre nareaenhee ea 692 
EN GUN PUITSTSI aba see pat AS ea a US ace Rea ae LE er UR Pe aN ROP HET bn SEN AMER RAM 693 
Reproductive capacity ys sacs s otsccsls kisie sentence ds lb us puaa assess lay SPAM rel 693 
Wescriptioniolistages Apis bia e ee pes ane Am ay ene ea pha ane 694 
PINEVSECONGIPEMETA TOM) oye ees mais cede et elt cus fs tcc eta BA Ohi, lea he cra 703 
INGIVATIOS Men aNe Une teen a Rea eR eRe nT, Castner ea MLO iy aout tr ana aegs 703 
Reproductive Gapacitye cine dec eA eeu ees oe eine Natu gee Oe 704 
Wescnptiomol stagestc.c ts ees pass cms Aue eres wide Meck annaie dete BuO. rake 705 
eihesthind generation eee eye ae her men ae aha UE Be a hale ie 706 
IAG Livi tleSiememen ier in Le PRIA CMe en nar! ta Cnn d Arai seen aera e, Bhat 707 
Reproductive; capachtyincs cies es omnes Ain ald) aioils Sos sone ale musa aes iain ses 707 
Descriptionlolstapesiys wwe van mice eats saat ey Neuse ase cea aaa aor atten 708 
phhepounthtceneravion i yjae ei yr ae ete ee ME coh positon cd a ay ale ge 708 
Succeedingsrenerationsye mish esau ee a ele he Oe ees Ue eee 709 
INumiberzolgeenera tions irae cle se as sen eat, | NENA at y a Naa ICME Mach 710 
Reproductive capacity of Aphis pomi...........0.0000 cc eee 710 
The male-and-female-producing generation........................000.000. 711 
Description of mature apterous female, fourteenth generation........... 711 
The oviparous females and the males.....................0 00.00.0000 cece 711 
“TRIN CRE? oe 2k gH SPOT: 4 6. 1S IO tEY BIBER OER EEE CRE RR STACI tae AC aren Cte ty tl MEN Pomer 716 
The production of winged forms...............0 0.0 cee cece eects 717 
FHOOG EP Las ey es pees ete Ne eerie alt a ee A eM ce cee mee ie Meee AL 718 
The rosy apple aphis (Aphis sorbi Kaltenbach).................... 002 cee eee eee eee 718 
SADOLEAITIY o.oo es sg NEL ra a ad Pte Se PP Recher 719 
INSTORICA MBIA eM Newey e a ec i ROM ame Ne ee or hs hung di UO in a Als 720 
Introduction and spread of summer host plants.....................0..00-5. 721 
TD ISHHPET NUH LOPES 6! OS fear ate pene Nor SIA I ANE EaVIRLG ERI  i aoO Ura a me UR ICU one Sem cteoMn 724 
IN GUI M IIS GO mys yes were nena gree ches soos Se eee ore tiny rau tug salsteen mao aN ee Uaey tbs 724 
eNeastemmpmo thence risew meme ey oe eure ray te ars Osi Pala ae UNE, MASE Mia Re any ced 725 
Reproductive period? Aaya Wisco sue tie cise Mone mouths ae eiaheey nem ratsaleyers 726 
Wescriptionvolistagessersaeie sme sete sheers a ee ee aR. Semea tegen 726 
piheysecondugeneratlom a jyite rs erste oe oss Siedevan ti bmesvere sla Galea eta aiene sole 733 
Re productivercapacit yrs semi aico- Cie ds oOo ailele: ciel sueceroterendee ee Guolet )Glens epeus 734 
Weseriptionvol Stagegy nM. jreiaaiccs eek wiecea cs) aie ce lelevcie, are asthe, eyacce shebowepeieye Secu cn ites 734 
she gthirdyceneratlomey ep Momo ke sleeve esol cone cere\ a thal arg a seuik maciateteenlok) Sensnamene 736 
Deseriptioniolistages sewn wiry em etdh Ade a saarateye rename sunieeensamiale eine erties 737 
Peg OUTLMVPeCMETA GIO axle soe kia ees Plcse bch Giclee aylsc # sce lave Sioneuetere ctslisnayratenie Syetelt 739 
Pedra era tOnysLOLMS cree iy Ya wee ces acetate th oes aie Wivelal eo aahs cary untae crate alle sylateliey apebenr 739 
Habits of the migratory forms.................0.0eeeeeeeee Sea ron tntetae 741 
Muherumme;nhostsplamtaletc. camera isicreis © ecko tess ecelleter a once conaces aie outs tevlens oho aresietert 742 
PINES SUTIN TA OPUS eens heen tata Sass ce la) ouslert icles by Sie Tonsl bvaileitanerauaytaiauel olarereliecevave o\eeke 742 
Habits of the summer forms). 12. 2.) ecle. «ot eels else © aise eee v6 see els 746 
IDESCLIP LIOMMOIMSbALESH ewer erro cni alias st cvaie, Gieielalezeleisytieserecolatataiarteuele’s ley 746 
