394 APHIDS OF THE ROCKY MOUNTAIN REGION 
BB.—Abdomen of alata without dorsal patch or bands; cornicle longer than 
unguis, 2 to 3 times length of rostral IV+V, slightly swollen. Cauda elongate. 
(p22 Se Se The Pale Chrysanthemum Aphid (Rhopalosiphum rufomaculatum) 
Cineraria (Cineraria sp.) 
A.—Antenna longer than body; frontal tubercles exceeding vertex. 
B.—Cornicle with either reticulation or striae at tip; alata without dorsal dark 
patch on abdomen. 
C.—Cornicle reticulated at tip, without darker green spot about base; alata 
immaciulated) Gp.7 S24) a eee The Potato Aphid (Macrosiphum solanifolii) 
CC.—Cornicle with apical striae, with darker green spot about base; alata 
with intersegmental dashes and lateral spots. (p. 342).................. ‘Jaa Neca eee 
Ee a rae PEs ERIE AEST coe eM UM Saat ent NE The Foxglove Aphid (Myzus solani) 
BB.—Cornicle without reticulation or striae; with dorsal dark patch or bands 
on alata. 
C.—Aptera immaculate; cornicle swollen, longer than distance across eyes 
in aptera, shorter in alate vivipara; sensoria absent on IV. (p. 340).................. 
EBs ce vps AO ed Ae eh Ye Ba he cs hh The Green Peach Aphid (Myzus persicae) 
CC.—Aptera with dorsal horseshoe-shaped patch; cornicle cylindrical, 
shorter than distance across eyes; sensoria present on IV in alata. (p. 336) 
Bien rs Bea Sek le tet lO The Crescent-marked Lily Aphid (Myzus circumftlexus) 
AA.—Antenna shorter than body; frontal tubercles not exceeding vertex. 
B.—Cornicle smooth; cauda short and broad; body pale green with dark dorsal 
patch present on abdomen of alata. (p. 142)22) 2 eee 
See PR a ehinee fiaee oA ep) Ss Utes Bane ep Ue The Leaf-curl Plum Aphid (Aphis helichrysi) 
BB.—Cornicle imbricated; cauda elongate, spoon-shaped; body pale yellow, 
medium green or dark green individuals in same colony; without dark dorsal 
patel: insatata (D-plo9 jee eee The Cotton or Melon Aphid (Aphis gossypii) 
Clematis (Clematis ligusticifolia) or Western Virginsbower 
On-leaves, on underside, rather solitary. 
Frontal tubercles exceeding vertex; antenna longer than body; body pale greenish 
yellow; cornicle swollen slightly, about same length as III, with reticulated area as 
long as hind tarsal II; rostral IV+V longer than hind tarsal II; cauda tapering, 
.25 long on median line, twice length of hind tarsal II, bearing 2 to 4 hairs on a side. 
(p.1232) 2 ee ee eee The Wild Clematis Aphid (Amphorophora brevitarsis) 
Clover, Red and White (Trifolium sp.) and Sweetclover (Melilotus 
sp.) 
A.—Frontal tubercles exceeding vertex; hind tibia longer than half of body. 
B.—Frontal tubercles converging; cornicle as long as 1 to 1.5 times distance 
across eyes; cauda 2 to 3 times as long as rostral IV-+V and 1 to 1.5 as long 
as) hind *tarsalallz.(p9o40). 5 eee The Green Peach Aphid (Myzus persicae) 
BB.—Frontal tubercles diverging; cornicle 1.5 to 2 times as long as distance 
across eyes; cauda 3 to 4 times as long as rostral IV-+V and 2.5 to 3 times as 
lone as hinditarsalello(p-0320) ee ee ee The Pea Aphid (Macrosiphum pisi) 
AA.—Frontal tubercles not exceeding vertex; hind tibia not longer than half body. 
B.—Body black, shining; sensoria 4 to 7 on III of alata; cornicle 2 to 3 times 
as long as hind. tarsal-Il' or basevof VEE (p.. 151) nee ee 
sc bee ten at ig eee MI eee eae ee Eee ER re The Cowpea Aphid (Aphis medicaginis) 
BB.—Body green, with or without dorsal patch on abdomen in alata;’ sensoria 
20 or more on III of alata; cornicle about the same !ength as hind tarsal II or 
of base of VI. 
C.—Dorsal patch present on abdomen of alata; rostral IV+V .10 long, 
attaining 2d coxa; sensoria usually absent on V. 
D.—Cornicle imbricated. (p. 124).................. The Clover Aphid (Aphis bakeri) 
DD.—Cornicle smooth. (p. 142)........ Leaf-curl Plum Aphid (Aphis helichrysi) 
CC.—Dorsal patch absent on abdomen of alata, rostral IV-+V .15 long, at- 
taining 3d coxa; sensoria.present/on V of alata. (p.132)-.........2s) ee ee 
Miasizen pe The Long-beaked Clover Aphid or Hawthorn Aphid (Aphis crataegifoliae) 
Corn, Indian (Zea mays) and Broom Corn (Sorghum vulgare) 
A.—Frontal tubercles exceeding vertex; dorsal patch, sometimes broken, present on 
abdomen ofalata. (p.'340) 2... eee The Green Peach Aphid (Myzus persicae) 
AA.—Frontal tubercles not exceeding vertex; abdomen of alata without dorsal patch 
or bands, 
