390 APHIDS OF THE ROCKY MOUNTAIN REGION 
BB.—Cornicle at least twice as long as hind tarsal II. 
C.—Body rusty brown with dark dorsal patch on abdomen of alate vivipara; 
amber to salmon to rosy pink in aptera; cauda short, not longer than broad; 
sensoria 50 to 60 on III, 20 to 30 on IV, 3 to 8 on V in alate vivipara; 
cornicle curved slightly outward at tip. Curling leaves badly; several gen- 
erations present in spring, only stragglers in summer. (p. 169)........--...--.------------ 
Sets ep BUS a ee eae vig BT A Ete ay Reel At gee eth saute The Rosy Apple Aphid (Aphis rosea) 
cc.U-Body green, dorsal patch absent on abdomen of alata; cauda longer 
than wide; sensoria not more than 24 on III, not more than 10 on IV of 
alate vivipara; cornicle not curved outward. Not curling leaves badly. 
D.—Cornicle slightly swollen near tip, pale to dusky; sensoria 12 to 24 
on III, 2 to 10 on IV, 1 to 6 on V on antenna of alata; media of fore 
wing with 2d fork short, one-fourth to one-third the distance from 
margin of wing to Ist fork. (p. 215) 2.22. ncccceceec ccs enec acon t cee ea ate 
sdusctpcsancperstecestot acer tecscecscunreeeeee tes The Apple-grain Aphid (Rhopalosiphum fitchii) 
DD.—Cornicle cylindrical or tapering, black; sensoria 6 to 9 on III of 
alata, absent on IV and V; media of fore wing with 2d fork from third 
to half of the distance from margin of wing to 1st fork. (p. 164)......-......... 
phic id Lennie ereey taal noel Sly eh UAE Petia) The Green Apple Aphid (Aphis pom1) 
Ash, White (Fraxinus americana) and Red (F. pennsylanica) 
A.—Causing bad curling of leaves. Antenna not longer than third body; body pale 
yellowish green, with darker green on median line; woolly; wings hyaline. (p. 368) 
EHS Airs cS Aheteae RN hs) A ML Be The Leaf-curl Ash Aphid (Prociphilus fraxinifoliae) 
AA.—On bark of twigs. Antenna longer than third of body; body brown; woolly; 
wings slightly smoky. (p. 368)......The Smoky-winged Ash Aphid (Prociphilus venafuscus ) 
Aster (Aster sp.) 
A.—TLarsilacking.” Gp.) 190) sescsescecceet eae eee The Grindelia Aphid (Atarsos grindeliae) 
AA.—Tarsi present. - 
B.—Fore wing with media simple; sensoria transverse. Living on roots. (p. 359) 
NPE ia ig aathlaliee trot bee at 48 Poplar Sugar-beet Root Aphid (Pemphigus balsamiferae?) 
BB.—Fore wing with media twice-branched; sensoria circular. Living on twigs 
and leaves (except A. armoraciae and A. maidi-radicis). 
C.—Frontal tubercles not well developed, not exceeding vertex; cornicle 
short, less than twice length of hind tarsal II. 
D.—Cornicle smooth. Aphids living on leaves and stems. 
E.—Cauda elongate, slender on distal half, with one or two capitate 
hairs at tip; wing veins. blacks (p.°124)2.ic-0 cee. eeeencree 
Metetee Se ee The Little Black-veined Aster Aphid (Aphis asterensis) 
EE.—Cauda short, not longer than wide, broad, without capitate 
hairs at tip; wing veins rot( black. (p. 142) ..c..2..---c0.-see 
PRD an As Po eae eels ok 1p, SS The Leaf-curl Plum Aphid (Aphis helichrysi) 
DD.—Cornicle imbricated. Aphids living primarily on roots or bases of 
stalks, 
E.—Sensoria on III of alata fewer than 10, in aptera fewer than 8. 
(psp E51 Vente eer eee ge eee The Corn Root Aphid (Aphis maidi-radicis) 
EE.—Sensoria on III of alata 10 or more, in aptera 8 or more. 
(piel23\\ 74 eee ee The Western Aster Root Aphid (Aphis armoraciae) 
CC.—Frontal tubercles well developed, exceeding vertex; cornicle long, at 
least 4 times as long as hind tarsi II. 
D.—Frontal tubercles converging; cauda short, shorter than twice hind 
tarsal II; cornicle’ not reticulated at tip, (p.°336) co.cc scosteceeeeseee eee 
Ss see reese tt eth dees The Crescent-marked Lily Aphid (Myzus circumflexus) 
DD.—Frontal tubercles diverging; cauda 2 or more times as long as 
hind tarsal II; cornicle with reticulation on distal end. 
E.—Unguis not longer than cornicle. 
F.—Unguis about same length as cauda, shorter than distance 
across eyes. <(0p.¥334) is. eee Macrosiphum zymozionensis 
FF.—Unguis longer than cauda. 
G.—Unguis 1 to 1.5 times distance across eyes; one or two 
capitate hairs near tip of cauda. (p. 304).................-cccccscccseeneees 
eee The Canada Fleabane Aphid (Macrosiphum erigeronensis) 
GG.—Unguis twice distance across eyes; no capitate hairs 
On: tipvof cad aw (pind Lie eee Macrosiphum katonkae 
