230 APHIDS OF THE ROCKY MOUNTAIN REGION 
7) Cornicley,75=.88 ‘long! (p23 2) rec tree nace cee ee eee ee bonnevilla 
> ~Cornicle 1.48-1.58 lOmg.2.2c2ccccocccoesccnccecncccrseoscveretacesunscnse vecccreeccaceusetesvaceetons, Joes tet te 8 
8. Rostral IV+V .17-.19 long; sensoria on III of apterous vivipara 20 or more 
(Pie 234 Vig cesersascsacactcesceseerencencesees evade le seeconcwes sete samt eed ct ea aee ote e de eae eens OSE Cee crystleae 
Rostral IV+V .15 long; sensoria on III of apterous vivipara fewer than 10 
(ps (243 ie isiecexts eee oe are saan hae tties nebo sedate nest coc stanleyi 
9. Sensoria‘on LIl of alata more’ thamn'30) (p23 ly) eeccccreecee ces ccce cee tee ns seca eeee cee eanne eee arnicae 
=.  wensoria on IIT of alata fewer:than 30% (ps (24:2) oceccecetee eae eevecgeeree eee rubicola 
10,. ‘Cornicle shorter’ than DD. oc.. cocoons cee cecc chap ccsecnteceacesconavensedenvertouch soo raceecactee ete et ee a 11 
ws --Cornicle not -shorter than. [1 Vi.. 2250... coc. caso. cevecc<nsantbectusansodcascuce tuseesstsevassvetecneve sos =p 22 
11, Cornicle conspicuously dilated) ini middle (pi 231) rccccccteccceceeecccesereceen neces nent ampullata 
i  Cornicle*not conspicuously dilated ‘im middle ces eee eeecerce tence 12 
12. Sensoria fewer than 20 on III ‘of alat acscenccccecc-ccscacccocesec se depos evessceeeeayssseeo ee 13 
.« gensoria more than 20 0n TIT of alatazic.cccccscccsccsstocccss-oscecesssconeesssotenee tooo 14 
13. SRostral IV-=—-V .19:lomge (ps 245) siscctsec pecs woccseneccocess cases eeuseceeecoeeta cee rate ae ton ae urtica 
oo! CRostral [V=-V 11 long.(p236) sae he eee ne ee grindeliae 
14:. ‘Rostra IV-—-V .20!longe” (pi5240) oo. checcseeccsccasecceseeenssce noe etna ee pawtincae 
«es  JRostral IV-+-V shorter that, :20.. 2. -cci.co-iccscckncnesdeseascsns shes eso eect ons Fe 15 
15. Base of VI longer than hind tarsal, TU -...-22.c.....:-.2icicsticteeacessceteeesssacesa- cee aes f) 
tel =ase lof VI not longer than hind’ tarsal 10s 22sec cee eee aa 19 
16.5 ‘Sensoria present on Ill/of apterase2..2-]. 2 eee sie 17 
=. ~sensoria absent on II] of aptera (p..233))-21c cc. cocceececccecee cee nesecs eee ate crataegi 
17, Sensoria-20-30 on IRI of iaptera® (ps 230) a2.n. ee ceetea dace cs ercseecey es cee eee oe agathonica 
«en wensofia 7-20. on ITI of. apteéra:-s..nc.--2.ccceecscceses se -cndsooneeaee evacees ses ohees= eo 18 
18. Rostral IV--V_ .14-,16 (1p. 241) ...----ccncceccnngncsenentectatangenecenscnsnedadaovisest=Tceieees-«ee eee tae aa rubi 
wee, * Rostral [VV (18-019 (pe 244) cocci ce wgecccttascass savanesasseesecssctcsts ee sctovee eee ten a ene tigwatensa 
19. Hind tarsal II coequaliwith base’ of. Vib .ccci ces sc oso ci tececeectsaceneste 20 
zea Hind tarsal II longer than. base: of, V Divcxcccic dv cacccssesteteeeccstce eee 21 
20. Sensoria usually absent on IV of alata (p. 240) .22..cc.ccccccctscectccserss.cteetee ces neseen ribiella 
i= - spensoria present oni LV. of: alatan(p. 239))cecereteacecccee eeece eee nigricornis 
21., ‘Sensoria 10-18 on IV of-alatas(p.y242) 2h cceccccec Stee ss erence sonchi 
we isensoria 2-4.0n IV of alata: (p. 234) .ccc0. ci scccctccccccssceesncct insets eee ee fronki 
22. Cauda with not more than-2 pairs of lateral haits.c.sc-4-ccob sce ceecceesccesoee 
«= Cauda with more than 2 pairs of lateral hairs) ..2...22-2......2-0 se 24 
23. Cornicle with greatest width less than twice that of narrowest part; 
Sensoriaal3-20) ony LLigofs ala t asec ccs seeee eree wecscesiedssin to: 26 
Cornicie with greatest width twice that of narrowest part; 
sensoria 5-7 on III of alata (p. 237 )stiscccecsscenscsveasceoes pcos ceend-cck Rosseecstussciohest ee halli 
24, Cauda with’ 3 pairs of lateral hairs (ps 245) ..2-4-- ee eee utahensis 
Cauda with 4 pairs of lateral, hairs :.c.c.:ctssece csc. lcpoe-cceesdniessuceuston=-o-0seeaene soe 25 
se | Cauda with 6-7 pairs ofilateral hairs *(p. 235 eco tee geranii 
25. Sensoria fewer than 27 on ITI of aptera (p. 240).-..2.0.--.1-n.0-1..4.0:5-k ee ribiella 
.«  Sensoria more than 27 on II] of apterai(p. 240) oe ieecscconcetsbars-. teases osborni 
26; .Appéndages: black: (pii237-)) ccna sc cst ct ee eee ee, janesi 
Appendages: not black=(ps 239), i:.2224.0 6.0 ek eee aes eee nervata 
Amphorophora accidentalis Knowlton 
Amphorophora accidentalis Knowlton, 1929c:39 (Description of alate male only). 
Male. Alate. Antenna beyond base of III black; cornicle, cauda and anal plate more or 
less dusky. Body length 1.5; antennal III .66, IV .50, V .42, VI .09-+.53, sensoria 24-37 on III, 
12-15 on IV, 9-10 on V; hind tibia 1.3; cornicle .27, smooth and with prominent flange; cauda 
elongate, blunt and bearing 4-5 pairs of lateral hairs. Rostrum blunt, without the needlelike 
tip always found on aphids feeding on Artemisia tridentata. 
Collections. On Artemisia tridentata (evidently accidental, as rostral tip is 
not the type found on aphids living on this host). Utah: Dry Lake. Alate male 
Aug. 10. 
Type. Knowlton Collection. 
Amphorophora agathonica Hottes 
Hottes, 1950c:98. 
Apterous Summer Vivipara. Pea-green without markings; antenna pale until beyond base 
of III, then dusky, becoming black on V and VI; cornicle pale at base, becoming dusky dis- 
tally; rostrum and tibiae dusky, darker at tips; tarsi black; cauda and anal plate pale. Body 
length 3.3-3.8; across eyes .58-.60; across head before eyes .45; antenna 4.90; hind tibia 3.40- 
