SUBFAMILY APHINAE i 
Amphicercidus maxsoni Palmer 
Amphicercidus maxsoni Palmer, 1936a:273. 
Apterous Summer Vivipara. Pale amber with dusky dorsal dashes which are often 
coalesced on abdominal III to VI; markings sometimes very broken or absent. Dorsal surface 
of head and antenna imbricated; dorsal surface of body marked with denticulate reticulations. 
Lateral tubercle developed on metathorax. Body length 1.3-1.7; hind tibia .85-1.1; hind tarsal 
II .13-.14; antenna 1.25-1.55; cornicle slightly curved. Hind tibia bearing 6-10 irregular weak 
sensoria on proximal fourth to third. Cornicle cylindrical with transverse wrinkles; cauda 
tapering and triangular, bearing 4-6 hairs on each side and a single dorsal preapical one. 
Alate Vivipara. Head and thorax dark; abdomen pale amber with dusky lateral areas 
and usually with slender yellowish brown dorsal dashes which are considerably broken espe- 
cially on I, II and III and broader on IV to VIII; all appendages dusky. Body length 1.5-2; 
antenna 1.5-1.6; rostrum attaining abdominal I. Hairs pointed, sparse, drooping; on vertex, 
antenna and side of abdomen .01 long; on hind tibia .02 long. Cornicle cylindrical, sometimes 
slightly narrower in middle and with long transverse imbrications and with flange at tip. 
Cauda broadly tapering at tip, parallel-sided with slight constriction at base, bearing 4 lateral 
and 2 dorsolateral pairs of hairs and a single preapical one. Hind tibia with proximal third 
slightly swollen and bearing about 2-9 faint sensoria. 
Ovipara. Characters the same as in apterous vivipara. 
Rostrum 
yt i 
(22- 3S 
ie 34 
Fig. 125. Amphicercidus maxsoni 
Collections. On roots of Eriogonum sp. Colorado: South Saint Vrain Canyon. 
Apterous and alate viviparae and oviparae Aug. 26; rare. 
Holotype. U.S.N.M., No. 51416. Paratypes, Colo. Agr. Exp. Sta. Collection. 
Chief Distinguishing Characters. Presence of sensoria on hind tibia of 
viviparae, relatively short III (shorter than unguis), long rostral IV+V (.20, 
much longer than hind tarsus or base of VI) and small size of body (not longer 
than 2). 
Acknowledgements are due to Maxson for the collection and contribution 
of the specimens and the calling of attention to its undescribed condition. 
Genotype Amphieercidus pulverulens (Gillette) 
Aphis pulverulens Gillette, 1911b:324. 
Amphicercidus pulverulens, Gillette and Palmer, 1932b:371. 
‘i we < - 
Cie iemranty ae 
8b So Sia nebade 
Fig. 126. Amphicercidus pulverulens 
Apterous Summer Vivipara. Sordid greenish brown; covered with abundant pulverulence; 
cauda, cornicle and appendages concolorous, with body to dusky. Measurements same as in 
alate vivipara. Young. Pale carneous, often greenish. 
