SUBFAMILY APHINAE 139 
This species seems to be very close to A. lugentis but differs as follows: 
Darker appendages, smaller body (not larger than 2), longer rostrum (IV-+V 
.16-.17 long, as long as cauda or hind tarsal II, attaining beyond 3d coxa) and 
unguis (usually longer than IV instead of usually shorter). The differences 
are not definite and further data and biological transfer host tests are needed 
to settle the status of the species. 
Aphis gossypii Glover 
The Cotton Aphid or Melon Aphid (Plate VIII) 
Aphis gossypii Glover, 1876:36; Gillette, 1908c:176; Patch, 1925b:186; Batchelder 
1927:263 variability; Gillette and Palmer, 1932:392. 
Apterous Summer Vivipara. Common Form. Pale yellow to pale sordid or yellowish 
green to mottled blackish green; antenna pale to dusky; legs pale with tips of tibiae and 
tarsi black; cornicle black; cauda, and anal and genital plate pale to dusky. Body length 
1.1-1.8; hind tibia .50-.95; antenna .65-.80 (often five-segmented). Small Form, Body length 
-9-1; antenna .67-.77. 
Alate Vivipara. Alatoid Nymph. Green with dorsum of abdomen flesh color; powdered 
on head and thorax and usually tesselated on abdomen. Adult. Head and thorax black; ab- 
domen yellow-green without dusky markings except on lateral areas, spot behind cornicle 
base and sometimes (visible in cleared specimens), dashes on abdominal VI, VII, and VIII 
and occasionally, broken remnants on IV and V;; legs pale with tarsi and tips of tibiae black; 
antenna rather dusky; cornicle black; cauda and anal and genital plates pale dusky to black- 
ish. Body length 1.1-1.7; hind tibia .46-1.08; antenna .80-1, secondary sensoria large, arranged 
in a single row; rostrum attaining 2d-3d coxa. Hairs on antenna and hind tibia pointed, 
minute, and sparse. Cauda slightly spoon-shaped, bearing 2-3 hairs on a side. Lateral tubercles 
evident on prothorax and abdominal I and VII. 
Alate ond | ae colt So 
P @= 2 Por dojase 
tras 20-35 
5 ' } es : t 
SA One Fo 8 ‘3 
Large Form .17 -.24 -- ie < 
Smal | Form 12-17 08 -.10 09-10 06 az Sy 
7 + =z { my 
eas : : 
SS i 8 08 “10 t= 
Fig. 154. Aphis gossypii 
Collections. On leaves and twigs of Amaranthus sp., celery (Apium grave- 
olens), Asclepias sp., Aster sp., Begonia sp., Capsella bursa-pastoris, Catalpa 
sp., Cicuta douglasi, melon (Cucumis melo), pumpkin (Cucurbita pepo), Des- 
curainia sp., Echinocystis lobata, Eupatorium sp., Galiwm sp., Hibiscus sp., 
Phaseolus sp., dock (Rumex crispus), egg plant (Solanum melongena), Verbena 
bipinnatifida, Wistaria sp. Throughout region. Alate and apterous viviparae 
March to November; common and very abundant, often injurious. 
Chief Distinguishing Characters. Variable color of body (from whitish 
lemon-yellow to blackish green in different individuals often in the same 
colony), color of cornicle (black), color of cauda (not black), number of caudal 
hairs (2-3 pairs, not bushy), small number of sensoria (not more than 12 on 
III and only rarely 1-2 on IV) on alate vivipara and tessellated pattern of the 
alatoid nymph. 
This name is suspected of being a synonym of A. sedi Kaltenbach (Patch, 
op. cit.). In Colorado, Sedum is recorded only in the hills and mountains and 
so far no aphids have been collected here on this host. 
