SUBFAMILY APHINAE 207 
Microsiphum artemisiae (Gillette) 
Chaitophorus artemisiae Gillette, 1911a:440. 
eck Ay a artemisiae, Gillette and Palmer, 1932b:475; Smith and Knowlton, 1938: 
Apterous Summer Vivipara. Young. Greenish. Adult. Dark blackish brown to cinna- 
mon-brown; shining; antenna beyond middle of III, cornicle and cauda dusky; most of tibiae 
pale, tips brown to black. Body length 1.6-2; hind tibia .90; hind tarsal II .15; antenna 1.40- 
1.95; cauda slightly broader at base than entire length; rostrum acute, tip beyond hairs acute 
but hardly needlelike, attaining between 2d and 3d coxae. 
Alate Vivipara. Head and thorax blackish brown; abdomen cinnamon-brown; antenna, 
cornicle and cauda dark; legs pale. Body length 1.4-1.5; hind tibia .82-1; all other parts as 
in apterous vivipara except rostrum hardly surpassing 2d coxa. Hairs blunt or slightly capi- 
tate, rather heavy; .02-.03 on hind tibia. Cornicle short, cylindrical or truncate, with flange 
and faintly wrinkled transversely or smooth. Cauda broadly triangular with tip narrowly 
tapering, bearing two pairs of lateral hairs and a single preapical one. Lateral tubercles shal- 
low and broad. 
Ovipara. Apterous. Olive-brown; otherwise similar to apterous vivipara but body more 
pointed and elongate posteriorly and with hind tibia pale except tip and slightly swoilen on 
proximal third and bearing small circular to oval, scattered sensoria. 
Male. Apterous. Greenish brown. Body length 1.30; hind tibia .56. Otherwise as in 
apterous vivipara except sensoria numerous on III, IV and V. 
ass bok Fund. 34-39 
Dye eo aes 
py ae a as RO = 
/ Gre 2 Ver aris inne: re 50~.66 
oO = ware 
La a SOA UU CT 50 —.66 
ais wel me PAD ana 
2 ee ae iy mae) -3)- 24 ag 
32-41 
Fig. 240. Microsiphum artemisiae 
Collections. On leaves and stems of Artemisia aromatica (formerly dracun- 
culoides), A. vulgaris and A. ludoviciana. Colorado: Generally on the eastern 
slope of the Rockies and on A. tridentata at Craig, Gunnison, Delta and Anto- 
nito. Utah: Generally in northern part of the state. Southern Idaho. Apterous 
summer viviparae May 18 to Sept. 22, alate viviparae May 18 to July 14, sexuales 
Sept. 25 to Oct. 8; not common but when occurring, very abundant on indi- 
vidual plants. 
Type. U.S.N.M., No. 41937. Paratypes, Colo. Agr. Exp. Sta. Collection. 
This species is closely allied to Cryptosiphum canadensis Williams but dif- 
fers as follows: Color of body which, according to Williams’ description, is 
green in the adult and rostral IV+V which, in cotypes, is .15 long and with 
needlelike tip. Furthermore, Gillette’s specimens were not curling leaves as 
Williams’ species is described as doing. 
This species does not agree entirely with the genus Microsiphum. It seems 
to differ somewhat in shape of cornicle and cauda. 
Microsiphum oregonensis Wilson 
Microsiphum oregonensis Wilson, 1915:91; Smith and Knowlton, 1938:165. 
Apterous Vivipara. ‘“‘Shining chocolate’; antenna beyond middle of V, anal plate, genital 
plate, tarsi, tips of tibiae and of rostrum dark; cornicle somewhat dusky; tibiae and cauda 
pale to slightly dusky. Body length 1.20-1.35; across eyes .33-.35; antenna 1.10; hind tibia 
.60-.70; rostrum attaining about to 3d coxa. Cornicle cylindrical to slightly truncate, with 
slight flange. Cauda tapering, with 2 pairs of rather long lateral hairs and a single preapical 
one. Hairs slightly fan-shaped or infundibulate to blunt on vertex and body and a few on 
antennal III, pointed on rest of antenna and on legs. 
