APHIDS INFESTING ECONOMIC PLANTS 409 
DD.—Hind tarsus shorter than III. 
E.—Body yellowish with dark brown areas; almost entirely covered 
with pulverulence; rostral IV .19 to 24, longer than half hind tarsal 
Vhs (p24) ee eee The Powdery Spruce Aphid (Cinara braggii) 
EE.—Body dark rufous brown, mottled with yellowish; little pulver- 
ulence; rostral IV .16, as long as half hind tarsal II. On Engelmann 
spruce. (p. 50)........ The Brown Mottled Spruce Aphid (Cinara vandykei ) 
Squash—see Cucumber 
Storksbill—see Alfilaria 
Strawberry (Fragaria sp.) 
A.—Usually on leaves, leaf stems and crown, occasionally on roots. Body dark green, 
mottled with yellowish; antenna shorter than body; cornicle 2 to 3 times length of 
hind tarsal II; III with 2 to 4 sensoria in alata; hairs simple; cauda shorter on 
median line than base of VI; antenna with unguis longer than III; rostral IV+V .13 
ton Lomong wlongcerthan-cauda onjmedian, lines (p.. 137) c:e.-ces-sseee crs cee ee eee eee 
StS Ok SR a es Ree eee tee ee Ree ras pe eh ee eee The Strawberry Root Aphid (Aphis forbesi) 
AA.—On leaves and leaf stems, not on roots. Body light green; antenna longer than 
body; cornicle 3 to 6 times as long as hind tarsal II; sensoria not fewer than 10 on 
III of alata; hairs capitate. 
B.—Frontal tubercles exceeding vertex .but not converging; cornicle never 
swollen; body immaculate; hairs distinctly capitate. 
C.—Hairs conspicuously capitate on vertex and antennal I, II and III, es- 
pecially in aptera; III .50 to .70; cornicle .30 to .40 in alata, .50 to .60 in 
apteracn (e256) ieee eee The Rose Strawberry Aphid (Capitophorus fragaefolii) 
CC.—Hairs not conspicuously capitate on antennal II and III; III .28 to .37, 
. cornicles 23 ¢om30\e(pw2035:) sea A eee Oe Ree ee Capitophorus minor 
BB.—Frontal tubercles exceeding vertex and converging; cornicle often slightly 
swollen; dorsal patch or bands present on abdomen of alata; hairs not distinctly 
Gapitates nC oA O)) acess she ee, Sed ils et oe pe The Green Peach Aphid (Myzus persicae) 
Sugar Beet—see Beet 
Sunflower (Helianthus sp.) 
A.—On roots. Antenna shorter than half body; cornicle absent; media of fore wing 
simple; III not longer than hind tarsal II; body pale olive-greenish to buff. (p. 367) 
ceased aa ae ene a ee a The White Aster-root Aphid (Prociphilus erigeronensis ) 
AA.—On leaves and stems. Antenna not shorter than half body; cornicle present; 
media of fore wing twice-branched; III longer than hind tarsal II. 
B.—Antenna shorter:than body; frontal tubercles not exceeding vertex. 
C.—Body yellowish green, mottled with darker green and darker band just 
anterior to cornicles in summer forms; fall forms brownish; not powdery; 
cornicle 2 to 3 times as long as hind tarsal II; sensoria 15 to 32 on III in 
alata, typically absent on IV and V and also on'III in aptera. Rostral 
1V-_V_. tl. :same.as base ot-antennal VU5° (i. 140) sicec en cacenc eset cchctencet eee 
AS Se eee neg aoseeeeeee----- The Dogwood Sunflower Aphid (Aphis helianth1) 
CC.—Body yellow-brown to dark dusky green with dusky markings and with 
powdery reticulation in aptera; cornicle about same length as hind tarsal IT; 
sensoria in alata 10 to 16 on III, usually present on IV and V as well as on 
Ties VeandsVein apteras rostfalplVictaV cL Sen( De E23) ccrecceeeeees see eee een eee 
pe eee es 2 Se J oe Cae The Western Aster-root Aphid (Aphis armoraciae) 
CCC.—Body dark olive-buff with powdery reticulation, especially in aptera; 
cornicle shorter than hind tarsal II; sensoria in alata 20 to 30 on III, present 
on IV and V and usually on III and IV in aptera; rostral IV+V .15. (p. 
AVE a cad pia eat rae ie ie inna meena aces Bit A eet ba NES RB ee Aphis debilicornis 
BB.—Antenna at least as long as body; frontal tubercles exceeding vertex. 
C.—Cornicle swollen. 
D.—Cauda at least twice as long as hind tarsal II; frontal tubercles not 
converging; dorsal patch absent on alata. (p. 238)........ Amphorophora masoni 
DD.—Cauda shorter than twice length of hind tarsal II; frontal tubercles 
converging; dorsal patch or bands present on abdomen of alata. (p. 340) 
pe ey Re Ne My Ah Se aera aoe The Green Peach Aphid (Myzus persicae) 
CC.—Cornicle cylindrical. 
