SUBFAMILY APHINAE VY? 
10. 
EL: 
EZ 
12a. 
13. 
14, 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
a2. 
23. 
24. 
25. 
Rostral IV+V .21-.24 long, barely attaining abdomen (p. 130).................. chrysothamnicola 
Rostral IV+V .24-.28 long, fully attaining abdomen (p. 145)........00.........ccceeeeeee infrequens 
Cornicle distinctly shorter than base of VI; entire dorsum covered with 
ITEIREREOEYCA Tele h ONIN ( Pitt 1 5g.) eee tact ewes Peer ee oe A cn eae ee nae eee eee minutissima 
Cornicle not distinctly shorter than base of VI; dorsum with broken pattern 
MENU ALC DO CLC UTA CRON Bateco She tre oye eo ree epee A SOR ie Ce og WES OT deca ea th fost ehctav od Mes 6 
Cornicle coequal with base of VI; III not longer than .14 (p. 136)........00.0000 oo... filifoliae 
Gorniclerionrer tham base of Viv Pil longer that «14 scic.siccssscs seers ee cee eese eons esoeseeeeieesteenee 7 
RIMS USHSHOLCer telanel-5 tines. pase. oLeWd (pe l26) et ee es ee ee ee canae 
RANA ER GE SRT SIRES TAGE OE! V 225, tet at eeeor rats a tie NT ie 8 
Cornicle .10-.17 long in alata, .20-.27 in aptera; ITI .19-.25 long (p. 144)............ hermistoni1 
CorniclexaseaDOVviess Ul Lic30s. 307 Dark SO) See ees Seer ee te ee eee ee ee chrysothamni 
Cornicteni/=.24 longan alata, 22/-.45 in aptera (ps) 160) 22 eet aae nse ee se ee ee oregonensis 
SCOrnrcle:smootn eNOtdM Dri Cat CC eee eee ete eee ee etc ee eae 2 ee ae te hts neous ce 10 
Cornre emi ri bri ca tec eee a ee ee IE ee Se re et See ee te oe 13 
Rostral IV+V broad (less than 3 times as long as width at base) ; 
CAN ARACIICE RCD: 17. 7') Geet etme cts ene LE (oe De ete RE eS Me solidaginifoliae 
Rostral IV+V slender (3 times as long as width at base); cauda obtuse.............-....20..0.2--- 11 
Anal plate with median projection; sensoria fewer than 10 on III of alata 
(yee TURE asa eh ae ae ee aN Ne Le aN ead et Red ee ea enctiry iPr eee Pe Pee RRS a eee EE rae | rociadae 
Anal plate without median projection; sensoria 10 or more on III of alata......................... 12 
Caudaiproad. not longer than base of Vi- without blunt hairs... 00.2 oe ee eee: 12a 
Cauda slender, longer than base of VI, bearing 1-2 blunt hairs at apex (p. 124)....asterensis 
Cornicle and rostral IV+ V longer than 1.5 times length of base of VI (p. 127)........ cardul 
Cornicle and rostral IV+V shorter than 1.5 times length of base of VI (p. 142)..helichrys1 
Hind tibtavoh viviparae not. bearing» sensoriak.22...01cs ne a ee, 15 
Hind tibia of all viviparae bearing sensoria, (except A. viburnicola fall 
migrants, in some cases, then base of VI ending abruptly) (Fig. 212) -..02..0.........ececeeeeeeee 14 
Sensoria located on proximal half of hind tibia; cornicle shorter than twice 
FAS OROLM VEL Det! 7.0;) ee eee eee eee ee Mr 0 a a EN ee ee sensoriata 
Sensoria located on distal half of hind tibia; cornicle longer than twice 
aSeVOtmV: Les (paul S4)) fesse en eet emer eine oer Sse ee Sues bene ei ee de ees Lee viburnicola 
Rostrum broadly obtuse, IV+V shorter than twice width at base (Fig. 202)...........02...... 16 
Rostrum slender, IV+V longer than twice width at base (Fig. 185) .......0....:.2:::c:ceeseeeseoes 18 
Cornicle slightly incrassate; imbrications denticulate (p. 217)........ Rhopalosiphum matidis 
Cornicle cylindrical; imbrications not evidently denticulate:...2 2.00.20 ec eee 17 
Unguis 5-6 times as long as base of VI; cubitus of hind wing vestigial (p. 176)....setariae 
Unguis 3-4 times as long as base of VI; cubitus of hind wing 
CLES ERTIC CU pyc c O)) Mette eee oe ee ete Pe Rn et teria I ee ee cerasifoliae 
Coulcapenotelon ce erat tan blOad.yescte eects ee te 9 ae on Al UR ee 19 
Ge AMON Chat aArie DT Oa Cee cca eens ance nem on cee Ue ms ere, Oe Lee Leen ee eee meee cee 44 
Cauda bearing at least 6 hairs) on‘each’ sidei-....2...1 a Fete Se rack EE oie peas FB seh! Rar eens 20 
Cerade beating fewer than.6 Nairs on each sid e528 Aho ee ek ee ets 30 
Sensoria circular to oval with wide rims; unguis distinctly longer 
Te Se rte OY 0) G6 G8 oa he Rs i ee Se ole ee ec he tanh hen Bad Oates 59) oe a incognita 
Sensoria circular with narrow rims; unguis not longer than III2 =... 21 
Sensoria circular with narrow rims; unguis longer than III. (p. 164)............... pilosicauda 
PHOT TTCTERSHOTECE Tet ATi Vie ere ete ee rs teers der aa ee eet eR eR he edie Ce eee 22 
COGNTe LeaMOLCSHOLCER MEM AT « Vine etne ees ec coc tae en ec Sama aes ee eee tm Ge ce ee Dae Sue Rg gt ee Meat Foeeee 23 
III 1.5-2 times unguis; sensoria at least 20 on III in alata (p. 133).......0000.. debilicornis 
III about same length as unguis; sensoria fewer than 10 on III 
(Ty EUR SEN Gap HAZ opp ech tne 2 a A RE cy ee eres We Mn eae deen lis EE LN ay senecio-radicis 
III less than 3 times as long as base of WI; sensoria on III of alata fewer than 20.......... 24 
Piiecz oatinesass: long as base OfaVils) Sensoria 20=32(ps9146)lo eee ee ee knowltoni 
III 3-4 times as long as base of VI; sensoria on III of alata 20 or more...........00000...0.2....0---- 29 
Sensoria on III in alata fewer than 10, in aptera usually fewer than 8........00..........2seeceeeeeeee 25 
Senectia Ol. lit alata: lO.on mote, in aptera: $06 MOLres. ses. .c cee eee ee ee cae 28 
III in aptera .17-.22 long, bearing 0-3 sensoria. Hind tibia of ovipara distinctly 
SwOllenrtnrourhout and COV ereda with SCmSOlL as. :gsccntets cccd ete rre tant renee ee ee eee ei coer pe 26 
III in aptera .23-.30 long, bearing 2-7 sensoria; hind tibia of ovipara swollen 
only on proximal third, bearing about 3°sensoria (p. 152)-2-2...22. =... menthae-radicis 
*Cauda length and width in key refers to length on median line of sclerotic or hard 
portion and width at base of this portion. (See Fig. 1.) 
