250 APHIDS OF THE ROCKY MOUNTAIN REGION 
27. Unguis not longer than 4 times length of base of V To2no cies cccccencnostnss cee 28 
... . Unguis longer than 4 times length of basetof) VU ic-2c20c.coeccccccsccceseeceusareeusaengeeneeeate ett eee 31 
28. Antenna in aptera five-Sezmented,) (pi) 270) cscscccccceseece-ceaceceacecoces ceosscneseeg sees oeoeeres emer shepherdiae 
.. Antenna.in aptera six-segmented)).2.0:c2.11- Dulce sc-ccecdasescsesesiecesesensescascesscennde-seedegaersea) ?ppieese meade nena neta 29 
29. -Unguts shorter than) cornicle (ps 273) -cocce-cecacecccrencsencte scene on seeteres te eee ae xanthii 
sew Unguis longer) than cornicl esc 2. cic. eir ceo acsecccavace-cencetgecpsesceteresnenovactancesstos tant tetera a 30 
30. Cornicle about same length as IV and distance across CYES.............:sccccecesesssneecceeeessnncceueencenes 43 
Cornicle shorter than IV and about equal to half of distance across 
CV ES (Del 271). sadesecectebbaa eed kc careu teense soccer stout sescze sce eece ois gene ae as a ee spatulavillus 
... Cornicle shorter than IV, third or less distance across eyes (p. 260)................2:00: infrequens 
31s Rostrum’ not-with needlelike tip Cp. 250)) 2 cencccceccce sn netpereccernseccersceop geese eee eee acanthovillus 
ze. Rostrum with needlelike:tipy...225ccccesscesnssteces+--ncsesersdidsewacescocasdcversecssas.feseee beeen et 32 
3255 Unguis not shorterthani 15 timesiLl La 9205) peste etese=eneneee, emcee eee pseudoglandulosus 
-4. “Unguis shorter than’ 1.5 times UT De.nficccc..2. 2 cis sadocccsnccontececcezusacectnscacveasbonavensoaganeeeet tenn 33 
33. Cornicle longer than) (60 (p, 261) esecenccsccc sess eee eee Ere rt AM SEE ee ae ie longipes 
aw) s Cornicle not longer thay 1.60. icc.cc....-cesc-secessdoccsndestacecdescecetgts Pee tecchces tee Sen een ee 34 
34. Rostrum with needlelike tip; cornicle not longer than .50. 
OntArtemista, (pie 205) cot scse oo eer pseudoglandulosus 
Rostrum with acute tip but not needlelike; cornicle longer than .50. 
On (CArysotham nus ehssissescccideecies cssecdaccectenn ese fesuceen soosdettesantcetece eaeeta seo eee 35 
35. Hairs on vertex infundibulate, sessile; body hairs not very numerous (p. 254)...... elongatus 
... Hairs on vertex as above; on body very numerous (p. 265).............::ssssecccesereecesneeeeeeen palmerae 
36. ~Body hairs stalk edsc..n2.22c. 2. cicccks.ccesecnsSasececuscodeeeobecn sansa geeetecsesia ses enset sees KY 
as) (Body haits) Sessile 2osc.-5.2oc2.0 25. escscaccn ce cbet sce secesne cet tee oe ae eo tae cee nee ae 39 
37 Hairs on 1 and II ‘conspicuous (p3:263) -2c.22.os-2s roe ce ean eee ee ribis 
2 , ztlairs on Ivand II] inconspicuous. .2..<.2-.)-2:5-2 oo ae eee 38 
38. Cauda with 4-5 pairs of lateral hairs; unguis twice as long as III; 
sensoria 20-30'on' Lil of alata (pic259 ) cccccocace oe ee ce ee hippophaes 
.... Cauda with 2-3 pairs of lateral hairs; unguis shorter than twice 
length: of EET (p5250)) eoskiccc Sacchi cacee ee ee case eae acanthovillus 
39. Hairs on vertex sessile-infundibulate, especially in apterae...................1.:cseceeececeeeceeeeeeeeteecenees 40 
Hairs on vertex infundibulate with stalk or fingerlike:..c...- 05 co eee ee 42 
«... Hairs, on vertex slenderly globate (py 271)... 220s eee sporadicus 
40. Cauda with 2-3 broadened hairs on dorsum) (p. 263) cc.cicsccccceeesses-s eee es eee oestlundi 
== 1 Cauda not with 2-3 broadened hairs %onm Gorsirmicececcccccce scoters rere ocean 41 
41. Body browns cornicle black (5 258,)o:cecceceoseee see ee gregarius 
i225 “Body green; cornicle pale to dusky, (prs 274) xcocceccweee cee were eee xerozoous 
42. Cauda broadly tapering, .13-.15 long on median line (p. 254).............2..--20ccceeeeeeeeeeeeees decampus 
Cauda slenderly tapering to spatulate, .17-.25 long on median line (p. 268)....quadritrichus 
Capitophorus acanthovillus Knowlton and Smith 
Capitophorus acanthovillus Knowlton and Smith, 1936c:108. 
Q Att 
(55 5.70 Sen jo4.) WO7-S Onis semis SS a 
ieee Co,[Alate pO | iV Ve) EIS Tyee) e 
Sa ee 
Apt. °27°.35 -.57 
R. 09 Alafe =Apt iv. 
Hd,Tib, 
|} _$-$ —O-00-— 
BRO) SHR Bel AF 
co 
ite i 
buysail/ { Is ae *28"-.30 
Body Hafrs itt 
A5-—.50 -"55” 
Fig. 295. Capitophorus acanthovillus 
Apterous Summer Vivipara. ‘‘Green.’’ (Mounted on slide), body immaculate with cauda 
and tibiae pale; antenna beyond base of III dusky; tarsi, cornicle, tips of tibiae and extreme 
tip of rostrum black. Body length 1.60-1.90; across eyes .48-.50; antenna about 2; hind tibia 
1-1.10-*'1,28”’; rostrum attaining 2d coxa. Cauda tapering, rather stout, bearing 2 pairs of 
lateral hairs and one dorsal preapical one. Cornicle slightly clavate to practically cylindrical, 
imbricated. 
Alate Vivipara. Same in color as aptera or with dusky portions darker. Body length 
1.40; across eyes .44; antenna about 2; hind tibia 1.05-1.09; rostrum as in aptera, tip obtuse. 
Hairs on vertex and body narrow-infundibulate or fingerlike to blunt or sometimes slightly 
globate; sparse. 
