180 APHIDS OF THE ROCKY MOUNTAIN REGION 
tapering, without distinct flange, imbricated, sometimes slightly curved inwards, Cauda 
elongate, spoon-shaped, bearing 3-4 lateral and 3-4 dorsolateral hairs on each side. Lateral 
tubercles present. 
Ovipara. Apterous. About same size as apterous vivipara, but more spindle-shaped; 
antenna .72-.80; hind tibia pale,® hardly swollen and bearing scattered, rather large, convex 
sensoria along most of length, but mostly on proximal half. 
Egg. Newly laid, light brownish yellow; later, black. Size .53 by .30. 
oe a. 
[ao Ane  1)) \yon) 
0 
Fig. 205. Aphis spiraephila 
Collections. On leaves and twigs of Spirea sp. Colorado: Greeley. Funda- 
trices May 7, apterous summer viviparae June 9 to Oct. 21, alate viviparae June 
9, oviparae Oct. 21; rare but numerous where found. 
Cotypes. Maine Agr. Exp. Sta. Collection. 
This species differs from the original description of A. spiraephila in the 
color which is given by Patch as “black”; but no structural differences were 
found and the determination was confirmed by Patch after examination of 
some of our specimens. 
Chief Distinguishing Characters. Long spoon-shaped cauda with bushy 
hairs, small number of sensoria (5-8) on III of alate vivipara, short, flangeless 
cornicle (not longer than cauda) and only slightly swollen hind tibia of ovipara. 
Aphis tetradymia Knowlton 
Aphis tetradymia Knowlton, 1941a:136. 
Apterous Summer Vivipara. “Bluish green; antenna, cornicle and cauda blackish. Size 
1.3 by .75; hind tibia .60-.71; hind tarsal II .10; antenna .81,” III .15-.23, IV .07-.10, V .07-.10, 
VI .07-.10-++.14-.20; sensoria 0-2-‘'4” on III, 0-1” on IV; cornicle .11-.13; ‘“‘rostral IV+V 
rather thick, .13 long, attaining abdomen. Cauda bearing 4-5 pairs of lateral hairs and 3 dorsal 
to dorsolateral ones. Lateral tubercles not all conspicuous.” 
Collection. On above ground parts of Tetradymia canescens. Utah: Fisher’s 
Pass. Apterous summer viviparae Aug. 16; rare. 
Cotypes. Knowlton Collection. 
This species appears to be very close to A. maidi-radicis but Knowlton 
states that it was found feeding above ground instead of underground and that 
it differs as follows: Darker bluish green, smaller size of body, longer antenna 
and usual presence of sensoria on III and IV of aptera. 
Study of the complete life history stages may reveal more distinct differ- 
ences, as only apterous viviparae have as yet been taken. 
Not figured on account of close similarity to A. maidi-radicis Forbes. 
Aphis tetrapteralis Cockerell 
Aphis tetrapteralis Cockerell, 1902:40; Gillette and Palmer, 1932b:449. 
Apterous Summer Vivipara. Grayish green; cauda and antenna dusky; cornicle and legs 
pale. Body length 1; hind tibia .45-.60; hind tarsal II .10; antenna .55-.60; rostrum attaining 
abdomen. 
Alate Vivipara. Same as aptera except as follows: Antenna .70. Hairs pointed, incon- 
spicuous. Cauda, tapering, acute, longer than wide, bearing 3-4 lateral pairs of hairs. 
