216 APHIDS OF THE ROCKY MOUNTAIN REGION 
constricted near base with 2-3 hairs on each side.* Lateral tubercles present on prothorax and 
all abdominal segments except VIII. Media of fore wing with 2d fork short, from fourth to 
third the distance from margin of wing to lst fork. 
Ovipara. Apterous. Light to dusky green with head light to dusky and orange stain about 
each cornicle base; appendages brownish; cornicle dusky, cauda pale. Body length 1.40-1.50; 
antenna .55-.60, III and IV coalesced; hind tibia somewhat swollen along entire length and 
covered with rather large, nearly flat sensoria. 
Male. Alate. Head and thorax blackish; abdomen olive-brown; antenna, cornicle and 
cauda dusky; legs brownish. Measurements about as in alate vivipara or a little smaller. 
Egg. Newly laid, deep green; later, black. Size .53 by .30. 
Collections. On leaves, (slightly curling them) and twigs of hawthorn 
(Crataegus sp.), quince (Cydonia sp.) and apple (Malus sp.) for winter hosts 
and oat (Avena sativa) and wheat (Triticum vulgare) for summer hosts. 
Throughout region. Fundatrices April 12 to June 9, apterous summer vivi- 
parae on winter hosts April 28 to June 26, and Sept. 5 to Nov. 14, on summer 
hosts June 6 to Nov. 19; alate viviparae on winter hosts April 28 to June 23 and 
Sept. 5 to Nov. 4, on summer hosts June 20 to Dec. 26 (latter in insectary); 
sexuales on winter hosts and summer hosts Oct. 17 to Dec. 9; very abundant 
and often injurious on grain. Not a serious pest on the winter hosts since it does 
not strongly curl leaves and departs in the second generation in early summer, 
migrating to the grain. 
Cotypes. Specimens used by Fitch (op. cit.) and referred to by Sanderson 
(op. cit2), US: Nave 
Chief Distinguishing Characters. Short 2d fork of media of fore wing, body 
coloration (green with darker bands and median and lateral line or mottling 
and with orange blotches about cornicle bases in young and aptera), early 
hatching of eggs (before buds start), black tip on the cornicle and habit of 
curling leaves little or none. 
A. crataegella Theobald (1912:9, n.n. for A. crataegi Buckton 1877:35, not 
Kaltenbach) according to descriptions by both Theobald (1927:206) and Buckton 
differs in straight cornicles and absence of longitudinal green stripes and red 
blotches at cornicle bases. In the sense of Hille Ris Lambers (1934:28, No. 33) 
and according to specimens determined by Rogerson, supporting his publication 
(1947:157-76), Theobald’s species differs as follows: Antenna in viviparae usually 
five-segmented and base of VI short (about .06 long) and abruptly joining the 
unguis, hairs semierect and rather conspicuous, cornicle in alate vivipara 
usually shorter than .20 and hind tibia in apterous vivipara not longer than .60. 
From A. padi this species is separated with difficulty and only, as yet, by 
the following characters of padi: Definite mealy covering in apterous fundatri- 
geniae, body color in summer aptera (plain dark green to olive-brown), in 
fundatrigenia longer III (.45-.52), IV (.28) and V (.24-.26) but with unguis the 
same as in fitchii, the frequently once-forked media of fore wing and a different 
egg size (.566 by .26). 
A. annuae Oestlund (1886:43) appears to agree fairly well, in all described 
characters, with the form here described but no darker green longitudinal line 
and red coloration about cornicles bases is mentioned. The types are not avail- 
able for examination of characters not included in the brief description and 
since it is recorded only on Poa it is not certain that it is the apple form. 
The types of R. prunifoliae (Fitch), alate viviparae, vary slightly from the 
Rocky Mountain specimens as follows: Cornicle shorter than .20 (.15-.18), sen- 
*Sanderson’s figures are obviously in error as to the number of hairs on the cauda. 
Specimens used by Fitch (op. cit.) and referred to by Sanderson (op. cit.) show only 
2 pairs of lateral hairs, in agreement with the form here described. 
