APHIDS INFESTING ECONOMIC PLANTS 391 
EE.—Unguis longer than cornicle. 
F.—Reticulated area om cornicle same length as hind tarsal II; 
body green. 
G.—Reticulated area on cornicle one-sixth to one-fourth of 
length of cornicle; hind tarsal II .15 long, not slender. 
(e290) ee ee eet yee ss ee! Macrosiphum breviscriptum 
GG.—Reticulated area on cornicle one-fourth to one-third of 
length of cornicle; hind tarsal II .20 to .22 long, slender. 
(Gee eye eee ee RRR, WEISS ee eee Macrosiphum tenuitarsis 
FF.—Reticulated area on cornicle twice as long as hind tarsal 
II; body dark reddish brown to black. (p. 294) ......00..22.cessceeeeeeees 
..-T he Dark Red Aster and Goldenrod Aphid (Macrosiphum atripes) 
Beet, Sugar (Beta vulgaris) 
A.—Living on root. Body pale yellow; woolly; antenna and hind tibia short; antenna 
shorter than half body length; cornicle absent or mere ring. (Pp. 359) -.-..c..c-scececoeceeeeeoeeees 
Oat Pe get he ek a ola alae The Poplar Sugar-beet Root Aphid (Pemphigus balsamiferae) 
AA.—Living on leaves. Body pale yellow-green or black; not woolly; antenna and 
hind tibia long; antenna longer than half body length; cornicle present. 
B.—Frontal tubercles not exceeding vertex; body black. (p. 135) ........-..::ccecsscceeeeeeeee- 
iS be goenacind. see eels AUS ERE a Ae ROME Oe ORM SRE e Re Pon iA NB at SO The Bean Aphid (Aphis fabae) 
BB.—Frontal tubercles exceeding vertex; body green with only dorsal patch 
bliacksitiralata G07. 340 Wore re ee Green Peach Aphid (Myzus persicae) 
Birch (Betula) and Alder (Alnus) 
A.—Causing deformation of leaves. Body of aptera bearing a distinct mar- 
ginal fringe of waxy threads; sensoria ringlike, encircling antenna. (On Betula) 
GI ID a Fata ope peat et 0 Ret nee oe ne Hamamelistes spinosus 
AA.—Not causing deformation of leaves. Body of aptera not bearing a fringe of waxy 
threads; sensoria not ring-like, not encircling antenna. 
B.—Frontal tubercles distinct; body not with black crossbands. 
C.—Sensoria narrow-transverse; body often very woolly. (p. 68)..............--.:---+- 
EA ee tees eee ASE HE eee ae The American Birch Aphid (Euceraphis gillettei) 
CC.—Sensoria not narrow-transverse; body not very woolly. 
D.—Cornicle mammiform; alata with 2 longtitudinal brown vittae on 
TOT Wise 7B) canter ce rece siac nce eco ose os eee a os eee ea dys. Se Oestlundiella flava 
DD.—Cornicle not mammiform; body without dark markings. 
E.—Hairs capitate in alata. (p. 67)................------ Cepegillettea betulifoliae 
EE.—Hairs simple in alata. (p. 65)........--.--------:::---0000+ Calaphis granovskyi 
BB.—Frontal tubercles not distinct; body with black crossbands. 
C.—Antenna not longer than body; unguis 2 times length of base of VI; 
sensoria fewer than 10; hairs on vertex long and curved or wavy. (p. 76) 
tg cul ie hated han WR Sal IR a et A eM ele ae | a Neosymydobius annulatus 
CC.—Antenna longer than body; unguis shorter than base of VI; sensoria 
more than 10; hairs on vertex short and spinelike. (p. 77)..............2:::-2:00e-eeeee0e=- 
tb OR ke haa ah as en ER eel i vac dn one ate Neosymydobius intermedius 
Blackberry and Raspberry (Rubus sp.) 
A.—On false wild raspberry or thimbleberry. (Rubus or Bossekia deliciosus.) Frontal 
tubercles not exceeding vertex; cornicle slightly swollen. (p. 213)...............222.:1e esses 
ert ne Se PRR. Sh als cliee. Bamk ema ee i aie ah Reread False Raspberry Aphid (Rhopalosiphum bossekiae) 
AA.—Not on false wild raspberry 
B.—Body small, hardly longer than 1 to 1.5; frontal tubercles not exceeding 
vertex. 
G Antenna six-seemiented . (pi 170) ccc tae ec wee Aphis rubicola 
CC.—Antenna usually five-segmented (p. 171)-...-2000..0..e-eeeeeeeee eee Aphis rubifolii 
BB.—Body large, length 2 to 3; frontal tubercles exceeding vertex. 
C.—Cornicle swollen; cauda longer than twice hind tarsal II. 
D.—Fore wing with blackish spot near tip; cornicle with distinct reticu- 
Lation mearetip. (Pc Z242) acre cect haces ae ara ae ees hase ce eee ee Feedocfiasnanitrnigsnenenmnnencis= 
Sg Ae cae Ee The Spotted-winged Raspberry Aphid (Amphorophora rubicola) 
DD.—Fore wing without blackish spot; cornicle without distinct reticu- 
lation, 
E.—Cornicle pale or but slightly dusky at tip; veins not bordered. 
