116 APHIDS OF THE ROCKY MOUNTAIN REGION 
Alate Vivipara. Color same as apterous vivipara. Body length 3; hind tibia 1.6-1.7; hind 
tarsal II .26 and slender; antenna 2.4-2.9; rostrum obtuse, barely attaining 2d coxa. Hairs 
pointed or slightly knobbed, drooping, .02-.03 long on body; .04 and .05 long on hind tibia. 
Cornicle cylindrical, weak, without distinct flange, faintly imbricated or transversely 
wrinkled. Cauda broadly tapering, rounded to semi-lunar, very faintly denticulate, with about 
3 lateral and 2 dorsolateral hairs on each side, hardly curved and hardly longer than those on 
vertex. Ocular tubercle shallow and broad, inconspicuous. Fore wing with media twice- 
forked. Lateral tubercles not apparent. Body integument covered with powdery reticulations. 
Ovipara. Color a little darker than in apterous summer vivipara. Measurements same as 
vivipara or slightly shorter in antennal segments. Hind tibia with proximal third slightly 
swollen and bearing scattered sensoria. 
Male. Apterous. Color of body carneous or yellowish brown; head, entire antenna, 
cornicle, tarsi and tips of tibiae black or blackish., Body length 1.9; antenna 1.84. 
Collections. On bark of Symphoricarpos sp., at or below surface of ground. 
Colorado: Fort Collins, Boulder and Ward. Utah: at Blacksmith Fork Canyon. 
Idaho: Castleford. Apterous summer viviparae May 2 to Aug. 9, alate viviparae 
May 10 to Aug. 9, sexuales Oct. 15 and 18, oviparae until Nov. 25; rather 
common. 
Types. U.S.N.M., No. 41926. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Genus Aphis Linnaeus 
Linnaeus, 1758:451; Buckton, 1879:31; Baker, 1920a:43. 
Characters. Vertex slightly convex; frontal tubercles never exceeding 
vertex (except possibly in rosea) slightly produced on medial margin only. 
Antenna six-segmented, unguis filamentous; secondary sensoria subcircular 
usually with narrow rims. Cornicle cylindrical or slightly tapering. Cauda 
tapering to cylindrical, often constricted near the base, surface very denticulate. 
Hairs usually pointed (except in asterensis, rociadae, rosea and solidaginifoliae 
where they are blunt); on body and appendages rarely longer than diameter of 
segments bearing them; on cauda nearly as long as cauda and curved. Anal 
plate rounded. Wing venation normal; fore wing with media twice-branched. 
Rostrum four-segmented, with V fused with IV, indistinct (except in certain 
species on Artemisia). Lateral tubercles present at least on abdominal I and. 
VII. Male often alate, ovipara apterous. Livi:g on leaves, twigs and roots of 
deciduous trees and plants. 
The genus Aphis is here used to also include species put under Anuraphis 
Del Guercio by many authors. The genus Anuraphis as conceived by said 
authors does not constitute a distinct genus since the only distinguishing char- 
acter seems to be the short, tapering cauda. This character correlates with no 
other character and is itself unsatisfactory on account of numerous intergrading 
forms in the different species and even in different life cycle generations of 
the same species. Indeed certain generations of the genotype species of the 
genus Aphis possess a cauda which would place them in Anuraphis.* 
Genotype (by suspension of rules; set by Latreille, 1802), Aphis sambuci Lin- 
naeus. 
Key to Species of Aphis 
1. Rostrum with tip beyond hairs needlelike in ventral aspect resembling 
dastinct eV, s(o1er 3 4.)e( p26) ue eee eee Casitas ie Se NR Sahai ae te Z 
Rostrum with tip beyond hairs not needlelike (Fig. 132) /s.ccscc-:-c--scnupo-ncsseeracnees ne 9 
2." Cornicle reticulated distally >( 1/246) <... secu a ee Artemisaphis artemisicola 
pu Cornicle. not Teti culated 20h. .o2 2. Loses casas cos oaneh mercgi o PR ae tear et eee 3 
3: Rostral [VV at deast..20 long. sc: tdceecere cic ater kee 4 
Rostral I1V-+V shorter than. .20 lomgissccGcci dh bavi hates A aren le ea ee 5 
*See Theobald (1927:264), Hille Ris Lambers (1934:28, No. 36 and p. 30, No. 49). 
