120 APHIDS OF THE ROCKY MOUNTAIN REGION 
52. Sensoria present on III, IV and V of aptera and alata (p. 161).................... pentstemonicola 
.... Sensoria absent on antenna of aptera and on IV and V of alata...........2.-22:c..:c2scceecceseeeeeeeeeeeees 53 
74. Sensoria typically absent'on V, in: alata oie. secc faces ease chee eee cee = canner ne ter eee ee 75 
«4  wpensoria typically present on) V im alatay ict. ccicc-cteccccnn cc tee meses aaa o ee ee eee on cap eee 76 
75. Body brownish green to blacks rostrum not hairy, (p: 136) 222 --- ce eee fabae 
Body light) green. rostrum bratty. (p15) ieee rereeseee nae ee neomexicana 
sx, AS above:except rostral TV4-V -10-212 (perl 67) eee cee se ee eee ribi-gillettet 
76. Cornicle usually shorter than unguis; rostral IV+V .13-.15. 
On) Oenotheras, .(p.- 158) (oe re ee ee oenotherae 
Cornicle’as above; rostral LV-—-V .11;) On Ribes) ((p. 167) ee ribigillettei 
Cornicle usually longer than unguis; rostral IV+V .14-.15. On Ribes. (p. 183)....varians 
77. Unguis twice as long as cornicle; vertex in alata produced, 
cone-shaped (ps 182) 2 .derekn ee cso ie secures casas acta eto ee ene ct en ae urovaneta 
.... Unguis same length as cornicle; vertex not produced. (p. 180)...............:.::20:0-- tetrapteralis 
78. Unguis not longer than(1-1.5 times base of, Vil (p:-1 79) cee ee spiraephila 
Unguis 1.5-2 times baSe of VT cccaeccccc los ene cate gst ccnp see Secs teced to 79 
awe | Umguis 2-3 times base Of VU ...-...c.scc..cicnccstcwencteancersaneanceissnterenecsciadantssualeiee cae gace se ea 84 
79. Cornicle slightly narrowed in middle; unguis at least 1.5 times V; sensoria 
on LIT of alata fewer than 10; absent on LV... (py 170) eee rubicola 
=  Cornicle not narrowed in middle -..--s-c.23. tcc chee eee 80 
80. Unguis equal to 1:5: times lenath of V.~ (pp. 158) coir cece ceecce cence cee ee ee nyctalis 
2.  Unguis shorter than 1:5 times length of V 2225.20 ree 81 
81. Sensoria on III of alata fewer than 20, absent on TV.) (p.0172)2.23..e eee rumicis 
Sensoria on III of alata-at least 20, present:on IV -:..4..-.2200.521 5s 82 
82. Sensoria on III in alata usually more than 25, more than 12 on IV and more 
thans5 onkViorC pie LSS i a ee ara ee neilliae 
Sensoria'ion’ LEI°30=36, on LV G6-15°on) Vi OF (pe 17S erence sambuci 
-.- Sensoria on III in alata usually fewer than 25, on IV fewer than 12, on V fewer than 4....83 
83. Unguis longer than I1Vi;"bodyilength 16-22 (ps 138 ) ese see ee ne fraserae 
=. Unguts'equal to IV ; body lengthy153-2.2. (pie i3 2) iscescecce tee ecnceeeeee enero cee cowenl 
--« Unguis shorter than LV; body length 222.9) 22.2 ccccccecceceeccessescesct ss tesserae tenses nee ee 89 
84. Cauda about half as long as base of WI, hardly longer than broad. (p. 185)....viburniphila 
.. Cauda two-thirds to as long as base of VI, nearly twice as long as broad..............--.::0000----- 86 
85. Cornicle slightly curved; imbrications denticulate, (p)) 135)22.....4. =e eriophori 
Cornicle not curved; imbrications smooths (qi) 12/7) eeeossseee ceareete: eect ceanothi 
86. Cornicle 1.5-2 times base of VI; sensoria typically present on IV in alata 
and;often:in‘apterasn (p4dS2) tei ee Ss a ee ae ee valerianae 
Cornicle 2-3 times base of VI; sensoria typically absent on IV in alata and never 
presentiin aptera <4. ieee ccccce cece east ela tetas cnenenenan dobes teens shcenas Saeed aenseee nna: ee ee 90 
87. Antenna with unguis not shorter than .16. (p. 134) c:,hccleeteee epee erlogoni 
Antenna with unguis shorter than .16. (p, 121) 2.:.222..4....-:-2-- 241-02 eee agathona 
88. Antenna with unguis longer than two-thirds of III; sensoria absent on 
antenna Of aptenas \ (pi. 22 7)) ie irecsctcs ees a ance secre re eens cre ree ee coe eee ete eee ceanothi 
... Antenna with unguis shorter than two-thirds of III; sensoria often present 
on Ill and LV. im’ apteras (5 186 Voce a cpesce cect eae see este eee zonassa 
89. Body length 2 or more; body dark green. On Senecio. (p. 147) ---------:c--:ccsseceeecceeeeeeee lugentis 
.-- Body length less than 2; body black. On ChArysothamnus. (p. 186)............-...2--0000+00-2 zonassa 
90. Unguis_longer than) 30utibial) bairsy-03 apt Geese center eee sorensoni 
’ Unguis not longer than .30; tibial hairs .01-.02. Not on 
Umpbelliferae:. (ps) 141) ocr ee es eae ee ee hee helianthi 
-«  Sameas above. On Umbelliferae. (ps 148)2..2 0.3. ac a ee ee heraclella 
91. Hairs on hind tibia .04-.05 long; hind tibia of ovipara hardly swollen, with 
few: Orinoisens ori ai (ped OG) io eee a eee ee ee ee ge pseudovalerianae 
Hairs on hind tibia .02-.03 long; hind tibia of ovipara much swollen, bearing 
MUMEFOUS SENSOFS 1 agi as aes see ce Reet ee ete ye facaanctinubigees tues heedi ee ee 93 
92, Cornicle about,the same length as half of unguis.., (ps. 171)... 4..cacsgunueoeeee rubifolii 
..._Cornicle shorter than half of the length of unguis. (p. 169) ........2...::csccccssseceseceeseeeseeeees roripae 
93. Cornicle longer than 1.5 times rostral TV -V  scciccscesiec-ccieopos-csusee coe 94 
»., Cornicle 1-1.5 times length of rostral EV--V i) (pi 154) csc a nasturtii 
94. Sensoria absent on III of aptera. On Rhammaus (p. 121) -..-...1..cc-sccccceceeccecsesssnssseneeeees abbreviata 
Sensoria often present on III of aptera. On Nepeta. (p. 137) -...:..:ccsscecsescesseeeeeeeeeeees frangulae 
