226 APHIDS OF THE ROCKY MOUNTAIN REGION 
Ovipara. Apterous. Color same as in apterous vivipara except hind tibia which is dusky 
throughout. Body length 1.43; hind tibia .45; antenna .63; cauda .17; with hind tibia strongly 
swollen and bearing large sensoria scattered throughout entire length. 
Male. Alate or apterous. Body length .95; hind tibia .48; antenna .70, secondary sensoria 
10 on III, 8 on IV, 6 on V; cauda .11. Other characters as in viviparae. 
Egg. Sometime after being laid, black; shining. Size .66 by .30. 
Collections. On leaves of Juniperus scopulorum, solitary. Colorado: Fort 
Collins. Utah: Logan. Idaho: Pocatello. Fundatrices April 21, apterous summer 
viviparae May 9 to Sept. 25, alate viviparae May 9 and Aug. 8, oviparae Oct. 11 
and Nov. 6, males apterous Nov. 6, alate Oct. 11; probably common but quite 
difficult to find due to protective coloration, appressed position and solitary 
habit. 
Cotypes. U.S.N.M. and Knowlton and Colo. Agr. Exp. Sta. Collections. 
This species is separated trom S. cupressi only by the six-segmented an- 
tenna in summer viviparae, once-branched media of fore wing and the differ- 
ence in hosts. 
Genus Toxoptera Koch 
Koch, 1856:253; Baker, 1920a:51. 
Characters. Same as for gens Aphis except as follows: Fore wing with 
media only once-forked and apte: often with short ventral process on frontal 
tubercle. 
The wing character used for separating this genus from the genus Aphis is 
not entirely satisfactory since it does not appear in the apterous form. Borner 
(1931:10) splits this genus into two groups, setting T. graminum (Rondani) as 
genotype for his new genus Schizaphis. The character which he uses is the 
relative position of the lateral tubercles as to the spiracles. This point is dif- 
ficult to determine and therefore, in the opinion of the writer, impractical. It 
seems less confusing to follow the established usage. 
Genotype (monotypical), Toxoptera aurantiae Koch (=aurantiae Boyer de 
Fonscolombe). 
Key to Species of Toxoptera 
1. (Cornicle;shorter than TV (Not takenuin region) ccc cee esce eae ee aurantiae 
«- Cornicle as long ‘asi TV qic-scccslcccessct tees sa dete ce sateese co tg eyon see ene ee ce 2 
2. Cornicle shorter than twice length of hind tarsal II; body black (p. 227)......muhlenbergiae 
.. Cornicle as long as twice length of hind tarsal II; body not black......................-.ccsecceseeseee 3 
3. Cornicle hardly as wide as hind tibia, without reddish blotch ) 
about: base’ (i226) Sec ree a ee ac ce a ee, A es ee graminum 
Cornicle slightly wider than hind tibia, with reddish blotch 
about base | (pi2227') ccna See hae ae ease en Se a viridi-rubra 
Toxoptera graminum (Rondani) 
The Green Bug (Plate VIII) 
Aphis graminum Rondani, 1852:10. 
Toxoptera graminum, Pergande, 1902:7; Webster and Phillips, 1912:1; Gillette and 
Palmer. 1932b:494. 
Apt. Viv= 
Ue 
rons 18-28 11-18 iva ae ‘10 28-35 
Proc. 
Alate Vix TT OT TO 
38-36 N57 rare ee 23 
we 
P| t 
-O O00" OOO R 8 ‘e =! 
Fig. 265. Toxoptera graminum 
Apterous Summer Vivipara. Head lighter than body, often pale straw; thorax and abdo- 
men pale yellowish to bluish green with darker green longitudinal streaks medially and 
laterally; cauda pale; antenna dusky beyond base of III; legs and cornicle pale with dusky 
tips. Body length 1.35-2; hind tibia .45-.85; antenna .75-1.15; rostrum broadly obtuse, attain- 
