SUBFAMILY APHINAE 133 
Collections. On leaves and twigs of Crataegus sp. as winter host, on red 
clover as summer host. Colorado: Fort Collins, Glade Park, and Eagle. Alate 
viviparae on winter host July 12, leaving summer host Sept. 3 to Dec. 9, alate 
male migrating Sept. 10 to Nov. 22; rather rare. 
Cotypes. U.S.N.M. 
This species is very close to A. bakeri, differing as follows: Presence of 
sensoria on V in alate vivipara, absence of dorsal patch in alate vivipara and 
the long rostral IV+V (.15 and attaining to 3d coxa or beyond). 
Aphis crypta Pack and Knowlton 
_ Aphis crypta Pack and Knowlton, 1929:199; Knowlton, 1935c:139. 
Apterous Summer Vivipara. Dark green; appendages, cornicle and cauda dusky to black. 
Body length .95-1.20; across eyes .35; hind tibia .60; hind tarsal II .11; rostrum attaining 3d 
coxa. 
R - Ca. 
belo ase tas Alate 13-15 Hd. Tb. S a, a 
YI) S i) oe 
Apt. .11-.12 
ED GREATEST an 8 CLE ? R a 
20-22 (Sen.6-8).13(SeN,1-3) 13 ay = 
Fig. 145. Aphis crypta 
Alate Vivipara. Dark green with dark lateral spots; all appendages including cauda and 
cornicle black. Body length about 1.50; across eyes .37; hind tibia .80; hind tarsal II .13; 
rostrum attaining 3d coxa. 
Collections. On Gutierrezia longifolia, on underpart of crown and on roots 
to a depth of two to four inches, on celery (Apium graveolens) and on Chryso- 
thamnus nauseosus subsp. nauseosus. Utah: Northeast of Great Salt Lake. 
Apterous viviparae July 3 and Aug. 3, alate viviparae July 3, Sept. 13 and Oct. 
4; rare. 
Type. Knowlton Collection. Paratypes, U.S.N.M. 
This species appears to exhibit no reliable distinctive character separating 
it from A. maidi-radicis. From A. gutierrezis it is separated by no greater 
differences than are found in the limits of variation shown in A. maidi-radicis. 
It appears very probable that the supposedly two forms on Gutierrezia are but 
variants of the corn root aphid. However, the following facts throw some 
doubt on the synonymy just suggested, namely: Gutierrezia would be a new 
host for the corn root aphid and corn root aphid injury to corn was absent in 
that locality. 
Further study, especially of oviparae, and biological experiments are 
needed to settle the question. 
Aphis debilicornis (Gillette and Palmer) 
Anuraphis debilicornis Gillette and Palmer, 1929a:10 and 1932b:394. 
Aphis debilicornis, Gillette and Palmer, 1932b:394; Hottes and Frison, 1931a:191. 
Apterous Summer Vivipara. Body length 2; hind tibia 1; hind tarsal II .15; antenna 1.1. 
Smaller individuals showing no secondary sensoria and ranging in all measurements from 
four-fifths to equal to size of the smallest typical forms but otherwise indistinguishable from 
the typical form, were found mingled in several of the colonies, more numerous in late sum- 
mer and fall. 
Alate Vivipara. Head and thorax dull black; abdomen dark olive-buff; dusky on head, 
pronotum and lateral areas of abdomen and dorsal dashes on terminal abdominal segments; 
cornicle, cauda, antenna and greater part of legs dusky. Body length 2.6; hind tibia 1.1; hind 
tarsal II .15; antenna 1.1, secondary sensoria round, convex, somewhat tuberculate; rostrum 
slender, attaining 2d coxa. Cornicle without flange, slender and weak, not broader than hind 
tibia or III. Cauda tapering, bearing about 8 hairs on each side. Hairs pointed, sparse, semi- 
erect. Lateral tubercles present on prothorax and abdominal I and VII. 
