338 APHIDS OF THE ROCKY MOUNTAIN REGION 
The Colorado examples are somewhat smaller in all measurements than 
those given in Essig’s description but specimens examined by Essig were deter- 
mined by him as his species. 
Myzus leucocrini Gillette and Palmer 
The Sand Lily Aphid 
Myzus leucocrini Gillette and Palmer, 1929b:470 and 1934:202. 
Apterous Summer Vivipara. Light green in nymph or young adult, brownish green to 
nearly black in old adults; with conspicuous rusty blotch at each cornicle base; dorsal surface 
reticulated; cauda pale; cornicle dusky especially at tip; antenna dusky on tips of III and IV 
and entire V and VI; tibiae pale with black tips; tarsi black; a pair of structures resembling 
ocelli or tubercles on head located dorsolaterally between base of antenna and eye and two 
more pairs on abdominal V and VI just mesad of cornicle bases. These structures appear 
white in life and as clear circles in cleared and mounted specimens. They are not easily ap- 
parent in all examples. Body length 1.6-1.75; across eyes .35; hind tibia .83-1; hind tarsal II 
.13; antenna 1.6; rostrum attaining 2d coxa. Hairs blunt; on side of abdomen .01 and sparse. 
Cornicle with outer margin curving so that tips converge, inner margin curving from broad- 
ened base to form more slender middle portion then forming slight swelling just before tip, 
imbricated and with distinct flange. Cauda blunt, nearly parallel-sided, with slight neck and 
bearing 5 pairs of lateral hairs. Antenna, including inner edges of I and II and frontal 
tubercles, strongly imbricated. Vertex with slight tuberclelike prominence. 
Alate Vivipara. Light green to dusky on head and pronotum; thorax black; abdomen 
green with dusky green dorsal dashes and lateral areas, orange areas about bases of cornicle; 
cauda pale to slightly dusky; anal and genital plates dusky; rostrum, cornicle and tibiae pale 
to dusky especially distally; antenna pale on base of III, otherwise dusky especially at tips of 
segments and entire VI; wings with veins slightly bordered. Measurements same as apterous 
vivipara except as figured. Tuberclelike structures located more posteriorly on head and not 
clearly evident on abdomen. 
Apt VV. 
a’ owe 
33-40 
: ) Gert 6-11 ' 26-30) 
Fig. 406. Myzus leucocrini 
Collections. On leaves of Leucocrinum montanum. Colorado: Fort Collins. 
Alate and apterous viviparae May 4 to 28; very abundant where occurring. The 
large number of alatae in May suggest migration to an alternate host. 
Type. U.S.N.M., No. 41921. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Body color (pale green in alate and black- 
ish brown to light green in apterous vivipara, also with orange blotch at each 
cornicle base) and veins of both fore and hind wings narrowly bordered, 
strongly imbricated inner edges of antennal I and II and frontal tubercles, 
peculiar shape of cornicle, numerous hairs (5 pairs) on cauda and small number 
of sensoria (6-11) on III of alate vivipara. 
Myzus lythri (Schrank) 
The Mahaleb Cherry Aphid 
Aphis lythri Schrank, 1801:115. 
Aphis mahaleb Koch, 1854:113. 
Myzus mahaleb, Gillette and Palmer, 1934:203. 
Myzus lythri, Mason, 1940:13. 
Apterous Summer Vivipara. Apple-green to lettuce-green; appendages pale except tips 
of segments; cornicle dusky. On Prunus. Body length 1.6-1.7; across eyes .44; hind tibia’ 
-80-.90; hind tarsal II .10; antenna 1.1-1.2; rostrum surpassing 2d coxa.. Hairs blunt, very 
inconspicuous; on side of abdomen not evident. Cornicle rather heavy, broader at base, 
heavily covered with somewhat denticulate imbrications; cauda tapering to a point, rather 
broad and short, bearing 3 pairs of lateral hairs. Dorsal body surface rugose. Frontal tuber- 
cles with rudimentary tuberclelike projection, seen only in certain position. On Epilobium 
sp. Body length 1-1.4; across eyes .33; antenna .75; hind tibia .53; hind tarsal II .07; rostrum 
attaining 3d coxa or abdomen. 
