410 APHIDS OF THE ROCKY MOUNTAIN REGION 
D.—Body dark brown; cornicle with reticulated area longer than hind 
tarsal II; sensoria at least 30 on III of alata, 14 to 27 in aptera. (p. 291) 
AU ka Hm ee Oa DL ee AEA a Se ee col The Ambrosia Aphid (Macrosiphum ambrosiae) 
DD.—Body pale green or pink; cornicle with reticulated area same 
length as hind tarsal II; sensoria 10 to 18 on III of alata, 2 to 6 in ap- 
terala(p7324) ee ee eee. The Potato Aphid (Macrosiphum solanifolii) 
Tomato (Lycopersicum esculentum). On leaves and stems. 
A.—Alata with dark dorsal patch or bands on abdomen; cornicle often swollen, im- 
bricated only, not longer than 1.3 times distance across eyes. (p. 340)......-.-.-.---::00--ee0---= 
Ea Pn Rr eMC oy Ae AR een Pea eet ers hs nad te Debs, wea te | The Green Peach Aphid (Myzus persicae) 
AA.—Alata immaculate; cornicle never swollen; either reticulated or with cross 
striae at tip; longer than 1.3 times distance across eyes. 
B.—Deeper green about each cornicle base, especially in aptera; cornicle with 2 
or 3 cross striae next to distinct flange; cauda not longer than twice length of 
rostral IV+V, 1.3 to 1.5 times distance across eyes, bearing 3 hairs on each side. 
CG ole fo Rt me ie 2 Rae ee a Rie kN oie ete are at The Foxglove Aphid (Myzus solani) 
BB.—Not deeper green about cornicle bases; cornicle reticulated at tip equal to 
length of hind tarsal II; cauda 3 times as long as rostral IV+V, longer than 1.5 
times distance across eyes, bearing more than 3 hairs on a side. (p. 324)................ 
Efea lst Beton Aer oA ea lel s0e od WY A 4 hab A AR) cae es 8 ge UB Se The Potato Aphid (Macrosiphum solanifol1i) 
Tulip (Tulipa sp.) 
A.—On bulbs. Antenna shorter than body; frontal tubercles not exceeding vertex; 
body pale brownish to whitish; sensoria numerous and tuberculate on III of alata; 
cornicle .12 to .14, same length as rostral IV-+V; cauda .06 long on median line, 
broader than long, bearing 2 hairs on each side, about same length as half of hind 
tarsalj DI4(p.11 81) 52s Seen ee eee ee The Tulip Bulb Aphid (Aphis tulipae) 
AA.—On leaves and stems. Antenna longer than body; frontal tubercles exceeding 
vertex; body pale green. 
B.—Frontal tubercles diverging; body immaculate in both alata and aptera; 
cornicle cylindrical, longer than 1.5 times distance across eyes, with reticulation 
on distal end as far as length of hind tarsal II; cauda tapering, on median line 
nearly as long as distance across eyes, bearing 4 to 6 hairs on each side. (p. 324) 
SR ae ete Re a ce cl ae The Potato Aphid (Macrosiphum solanifollii) 
BB.—Frontal tubercles converging; alata with dorsal patch or bands on abdomen; 
cornicle shorter than 1.5 times distance across eyes, without reticulation, usually 
swollen; cauda tapering, on median line, less than half as long as distance across 
eyes, bearing 3 hairs on each side. (p. 340)..The Green Peach Aphid (Myzus persicae) 
Turnip (Brassica rapa) and Radish (Raphanus sp.). On leaves. 
A.—Body brownish green, aptera with two dorsal rows of dark areas; frontal tubercles 
not exceeding vertex; antenna not longer than body; cornicle shorter than distance 
across eyes; sensoria 16 to 22 on III, 2 to 10 on IV, 0 to 2 on V in alata. (p. 220)........ 
ENS ele Rag elle en AE Aen rth SiN be A Nae The Turnip Aphid (Rhopalosiphum pseudobrassicae) 
AA.—Body pale yellowish green, aptera immaculate, alata with dark dorsal patch or 
bands on abdomen; frontal tubercles exceeding vertex, converging; antenna as long 
or longer than body; cornicle at least as long as distance across eyes; sensoria 10 to 
15 on III, 0 on IV and V in alata. (p. 340).......... The Green Peach Aphid (Myzus persicae) 
(On Radish only) 
Body light green with dusky dashes; slightly powdery; frontal tubercles not exceed- 
ing vertex; antenna not longer than body; cornicle shorter than distance across eyes 
and shorter than hind tarsal II, swollen; sensoria 50 on III, absent on IV and V in 
alatay: (ps 3494) eR ee A ee ee The Cabbage Aphid (Brevicoryne brassicae) 
Walnut (Juglans sp.). On leaves. 
A.—Cornicle a mere ring; unguis longer than half base of VI; body pale yellow, often 
with 4 dusky spots on abdomen! (p./ 69 ic ntcoete 
Pat Papas f FP See) Bee seeseecesteseeeeseseeeeeseeeeeeee Lhe American Walnut Aphid (Monellia caryae) 
AA.—Cornicle truncate, bearing hairs; unguis not longer than half the base of VI. 
B.—Hairs prominent, .10 to .15 long on appendages, cornicle and body; anal plate 
deeply divided; sensoria more than 10 on III of alata; alata with black bands on 
abdomen, aptera with 4 rows of dark spots; veins of fore wing heavily bordered. 
(Sib 4)) Wome theeeeaakges rte reee es Sea The European Walnut Aphid (Panaphis juglandis) 
