288 APHIDS OF THE ROCKY MOUNTAIN REGION 
42. 
43. 
44. 
45. 
51. 
52. 
53. 
54. 
Reticulated area on cornicle not longer than rostral IV-+V (p. 295).....--...--------00-e-0-- bonitum 
Reticulated area on cornicle 2-3 times length of rostral IV+V; 
cornicle 8 times:length of rostral! LV—--V- (ps S11!) oie caccacccccccescestoece resect cere ne katonkae 
Cauda especially in aptera longer than half of cormicle....................---e0cceeecscceeececeeneeccseneencenneeees 38 
Cauda shorter than half of ‘cormicl e5c.c22. oc. c2sccco acto nennse cane estecee eran ta senncnecsong nt banceatene sere eee eee 42 
Cauda about same length as half of cormic] @.22.c.ci2ccccc.<<-cacnccecececesqntecennee=cnteeeceeensanespeeegeenteeeeaeneaee 43 
Dorsum without dusky dots at bases of hairs. ..-...--- oo 2occcccce-nceccc--n cece noeenenenecey-cescnreoeendeneeaepenennees 39 
Dorsum with dusky dots at bases Of hairs... 2.5... .ctesinciveceecpeensencnsnseenceeowseans nd 41 
Reticulated area on cornicle extending about tenth of the length 
Of ‘cormicle™ (pos ':329) (ii. oesaes cease saan seca cane sea ett eee casein os ot ee aa eae eae timpanogos 
Reticulated area on cornicle distinctly exceeding tenth of length of cornicle...................... 40 
Sensoria on III of aptera 2-3; reticulated area on cornicle .13 long; 
rostral IV-+-V :1G lomg (po. 334) ance cvs cscs tsentccetneeeen est ee camp seeeraeeenetoaseatete a zionensis 
Sensoria on III of aptera 19-26; reticulated area on cornicle .22-.30 long; 
rostral 1V-+-V .19 long (pp. 322) 2a iscccssccccs i caceteessenenetenesjoupnanes ciece-etcsien catitrabe eee rudbeckiae 
V shorter than distance across eyes. (p. 294): ~..-2a::s0c-ccccresnetactecestoscneseneedns=rnas-grcacseraeeee ae atripes 
V longer than distance across eyes; reticulated area on cornicle .25-.30; 
body light*to dark brown (p.'291)  <-.o---2.2-.-c---csscscc cect tends necen acer senee neceseetecaaere tases eee ambrosiae 
V as above; reticulated area on cornicle .25; body dark wine-red (p. 315)................ martini 
V as above; reticulated area on cornicle not longer than .20; 
body black to blackish (p: 289)) 2.2. -<_.2c-20502 22s 2o cece sccsnese--seneecdnse-serusnescace ves ttencepecesenei een aaroni 
Reticulated area on cornicle exceeding fifth of length of cornicle (p. 326)................ taraxaci 
Reticulated area on cornicle not exceeding fifth of length of cornicle; IV 
distinctly shorter than III; body bluish with reddish tinge. Not on Valeriana 
ie BO ecrsenr en gr per ar eet a a Ee anise Re A St omen Ww Rn Ce Mts er EE ne pe kiowanepum 
As above but body yellow-brown. On Valeriana (p. 329) Lastbteneuteetie ee valerianae 
Reticulated area as above; IV not distinctly shorter than 
KEE Cps®322) eos ccccccce cote cccecee canercease cance enc tear ae ce ones ce el care ocean tena enna ee rudbeckiarum 
Body red or wine-color; sensoria present on III in aptera..............2.....--ccssccssesecceesneccesenseenaneee 55 
Body red or orange; sensoria absent on III in aptera (p. 317)...................... nigromaculosum 
Body not red or orange; sensoria present on III im aptera..........22.......22..-eeeeeecenenseeeeneneeeeeeeees 44 
Hairs on cauda fewer than 7 on each Side. i...csccoo ioe co oc ececce cece aducepencnaccecasesucsseeenteeeeeie eee 45 
Hairs on cauda at least -7 on.éach Side. -..20.0o0cs.2-cc.cercnccccmsseens -tctesnanasbaps+asurs-naeestteceetye eee eee 47 
Reticulated area on cornicle .20-.28 long; sensoria on III more than 10 in . 
both alata and aptera; sensoria absent on IV (p. 304)........--2..22.-.---escsceeececeeenceneees erigeronensis 
As above except sensoria present on IV (p. 331) -.....-.....-----cceeecceecececencctecceeeeees zerogutierreziae 
Reticulated area as above; sensoria on III not more than 10 in either 
alata. or aptera, absent:on: E-Vi( i322) .c-22-.-cccoc-c_esecccvece soe geeesees guns tghveonaneeseen voter eee rudbeckiarum 
Reticulated area on. cornicle £10.18. long -.....--<2.5i..0:c.---cecessatccos-saecces oo scenecaconreancaceetdausee re teeee enema 46 
Reticulated area on cornicle .07-.09 long (p. 329)...............:csscssscsesesccncescesseseensereceense timpanpgos 
Cauda with 4-5 pairs of lateral, haits.c.x..15 cecil occtivescsccccnces vssins scetdenonstuccete ccatesenizecn tee 56 
Cauda with 2-3 pairs of lateral, Waits sn.22.c.1ccccccccsescccncccssapnccnnaenst} anndcusacendcveerauis<tessies ea 58 
Reticulated area on cornicle .10-, 15) lom gsi sccicc2.c he cciccvauessbancau th pacdace coneded seseususclsuaessavqeneteee enna 48 
Reticulated area on cornicle longer than .20 (p. 310).............:ccccsccscccsseeceeeseesceeesteeenes idahoensis 
Sensoria 20 or more on III of aptera; cornicle green with 
dusky distally Gps *290) acc2cc2o2n ccs re geen cede eco albifrons 
Sensoria fewer than 20 on III of aptera; cornicle black (p. 334)...............::-ssceeceeees zionensis 
Rostral IV+-V shorter than base of VI... i ce 50 
Rostral IV-+-V longer than: base of Vi Tocco. oscars ci es ccceaceeendcanniennsteoctacnneee ee 53 
Sensoria on III more than 15 in alata, more than 7 in aptera.............c.--:csccsssecesesssscocsecececeeeeeees §1 
Sensoria on III fewer than 15 in alata, fewer than 7 in aptera...............c..c--cccsccscecencescceesenecocee 52 
Sensoria on III in alata more than 15, in aptera fewer than 7 (p. 334).........-00--0-- zionensis 
Reticulated area on cornicle .20 or more long; rostral IV+V .15; 
body: greet ((p.5327 ) sc Skeeter ce ee tenuitarsis 
Cornicle as above; rostral IV+V .19; body dark red (p. 322) ............cc-ccescecececeseeees rudbeckiae 
Reticulated area on cornicle shorter than .20 (p. 328) ............-csssccsssececcesesceseceaseee thermopsaphis 
Hind tarsal II at least as long as base of VI (p. 310).........c..c.scsscecescececcoceceseecerencereee granarium 
Hind tarsal II shorter:than base of V Uicpecscsstescebesueeeeee se i eee 54 
Body green or pink; sensoria 15-22 on III in alata (p. 308) ........-..---s:cscoccecesesceseceeeecoeseee- gaurae 
Body dark brown; sensoria more than 23 on III in alata.............-..:scs-o-scscocoejescesseecscoesceeececeseeeee 59 
Body pale brownish yellow; cornicle and appendages pale (p. 330).......:c-cc-ce-e----- yagasogae 
Body shamrock-green; cornicle and appendages black (p. 309).....-..-..-cssssccecsscecsesseses glabrum 
