SUBFAMILY APHINAE 339 
Alate Vivipara. Head and thorax brown; abdomen light green to rusty or light yellow 
with red on anterior portion of abdomen and on venter, especially in examples on Epilobium 
and with dusky dorsal! patch and lateral areas; antenna, cauda and cornicle dusky; tibiae 
yellow with tips blackish. Body length 1.3-1.7; across eyes .40-.44; antenna 1.3-1.6; hind tibia 
-90-1.05; rostral IV+V .13, surpassing 2d coxa. Otherwise as in apterous vivipara except 
dorsal surface smooth but with pigmented lateral areas denticulate and cauda with slight neck. 
Ovipara. Apterous. Yellowish to dark brown; all appendages dusky. Body length 1.5- 
1.8; across eyes .38; antenna .70, III .18-.20, IV .12, V .10, VI .09+.13-.15; hind tibia con- 
siderably swollen nearly to tip (on three-quarters of length) and bearing numerous sensoria. 
Male. Alate. Color and measurements similar to alate vivipara but with dorsal bands 
not entirely coalesced into a patch and appendages usually darker. 
Collections. On leaves and stems of tender shoots of Prunus mahaleb, as 
winter host; on Epilobiwm adenocaulon as summer host. Colorado: Fort Col- 
lins. Utah: Santa Clara, Farmington, Levan, Hurricane, and Springvale. On 
Prunus. Apterous summer viviparae April 25 to June 25, alate viviparae May 
29 to June 29 and Sept. 25 to Nov. 8, oviparae Oct. 9 to Nov. 1, males Sept. 30 to 
Nov. 3; common except during July and August. On leaves of Epilobium aden- 
ocaulon, apterous and alate summer viviparae June 15 to Nov. 23, alate males 
Sept. 30 and Oct. 6. 
8-20 ww 
$ Ha Ti. 
" Pyl\h, 4 
Ayadaahds 
29 9 oop ae) MITTIN ae 40 
orgo pak ta 
UBL E YE OTEIOS IOS SEO PEGE GATES F 028 ooehos. sossen 
ESCA lates seas) cb oa a +25 _ Rd. Ti. 
Fig. 407. Myzus lythri 
Epilobium sp. and Galium sp. appear to be summer hosts but no transfer 
tests have been attempted. Spring alatae refused Chenopodium album, cabbage, 
chrysanthemum and shepherdspurse in cages. Lythrum has not been tried as a 
host here. 
Mason’s synonymy is confirmed by specimens determined as M. lythri 
(Schrank) by Hille Ris Lambers. These latter specimens seem to agree in all 
particulars with Colorado specimens from mahaleb cherry. Myzus mahaleb 
(Koch) has been placed as a synonym of Phorodon humuli (Schrank) by Theo- 
bald and others, but this cannot be correct because Koch distinctly mentions 
the lack of the fingerlike projection on antennal tubercles. The Rocky Mountain 
specimens agree with Koch’s description. 
Chief Distinguishing Characters. Brown dorsal patch in alata with yellow 
or green ground color, often stained with red in alata on Epilobium and the 
green body in apterous vivipara, shape of the frontal tubercles (shallow in some 
views but with a rudimentary tubercle projecting mesad especially in aptera) 
and the heavily imbricated surface of these structures, shape of the cornicle 
(heavy, cylindrical and somewhat recurved outward) short unguis (rather 
shorter than III) heavy denticulate imbrications on cornicle and structure of 
hind tibia of ovipara, three-quarters of which is swollen and bearing numerous 
sensoria. 
Myzus monardae (Davis) 
The Horsemint Aphid 
Phorodon monardae Williams, 1910:89 (nomen nudum), 
Rhopalosiphum monardae Williams (nomen nudum), Davis, 1911b:36. 
Myzus monardae Williams (nomen nudum), Gillette and Palmer, 1934:204. 
Myzus monardae (Davis), Mason, 1940:14. 
