SUBFAMILY APHINAE 2A 
Ovipara. Apterous. Color as in apterous summer vivipara. Body length 1.50; hind tibia 
.66-.70; antenna 1-1.05. Hind tibia distinctly swollen on proximal two-thirds and covered with 
numerous sensoria. 
Male. Alate. Color as in alate vivipara or darker and more green. Body length 1.66; 
other measurements as in alate vivipara. 
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Fig. 258. Rhopalosiphum rhois 
Collections. On Rhus glabra and R. trilobata as winter hosts; summer hosts: 
oat (Avena sativa), Echinochloa crusgalli, E. sp., Elymus canadensis, barley 
(Hordeum vulgare), timothy (Phleum pratense) and Stipa sp. Colorado: Trini- 
dad, Manitou, Boulder and Fort Collins. Utah: Granite. Apterous summer vivi- 
parae on Rhus sp. June 6 to 19 and Aug. 31 to Oct. 12, on grasses July 12 to 
Aug. 19; alate viviparae on Rhus June 30 and Aug. 31 to Oct. 12, on grasses June 
23 to Oct. 16; oviparae on Rhus Sept. 29; males on grass Oct. 4 to 16; rather com- 
mon. 
Cotypes. Davis Collection. 
Chief Distinguishing Characters. Shape of the cauda (parallel-sided to 
slightly spoon-shaped, not tapering), smooth moderately swollen cornicle, about 
same length as IV in alate vivipara and small number of sensoria on III (2-8) 
in alate vivipara. 
Rhopalosiphum rufomaculatum (Wilson) 
The Pale Chrysanthemum Aphid 
Aphis rufomaculata Wilson, 1908:261. 
Siphocoryne artemisiae Del Guercio, 1913:177. 
Stephensonia lahorensis Das, 1918:175. 
Rhopalosiphum lahorensis, Takahashi, 1924:29; Theobald, 1929:339. 
Rhopalosiphum rufomaculatum, Hille Ris Lambers, 1934:33 (synonymy); Gillette and 
Palmer, 1932b:489. 
Apterous Summer Vivipara. Light apple-green with dusky to orange specks due to eyes 
of embryos showing through body wall; with yellow blotch at base of each cornicle; cornicle, 
cauda and anal plate dusky green. Body length 1.40-1.50; hind tibia .40-.55; hind tarsal II 
.09; antenna .80-.98; rostrum rather acute, attaining 2d coxa. Femora imbricated. Dorsum 
of body smooth to rugose. 
Fig. 259. Rhopalosiphum rufomaculatum 
Alate Vivipara. Head and thorax dusky; abdomen apple-green with two dusky dashes 
caudad of cornicles; antenna, tarsi and tips of tibiae blackish; cornicle, cauda and anal plate 
slightly dusky; venation of wings slightly dusky. Body length 1.20-1.30; hind tibia .65; 
antenna .95-1.06; secondary sensoria nearly flat. Frontal tubercles rudimentary. Hairs blunt; 
.01 on antenna and hind tibia. Cornicle slightly clavate, slender, widest portion hardly wider 
than hind tibia and with distinct flange. Cauda parallel-sided, blunt, with tendency to con- 
striction near base, bearing two pairs of lateral and a single dorsal preapical hair. Femora 
marked with imbrications. Prothoracic tubercles present. 
