88 APHIDS OF THE ROCKY MOUNTAIN REGION 
rostrum attaining between Ist and 2d coxae. Cornicle slightly vasiform. Cauda knobbed, bear- 
ing 2 pairs of lateral hairs and a single preapical one. Hairs pointed and inconspicuous; on 
hind tibia .03, on body .04. ; 
Collections. On leaves of Acer grandidentatum. Utah: Numerous localities, 
especially in the northern part of state. Idaho: Boise, Franklin and Mink Creek. 
Alate viviparae May 11 to Oct. 5; not rare. 
Holotype. U.S.N.M. Paratypes, Knowlton, Smith and Utah Agr. Exp. Sta. 
Collections. 
case Kin 
Sen. 11-21) Ha To, ca eae 56-73 -' 62" ) ) 
' 5 
Dorsal Tub. m _# 583" ———S—s) 
eergseeagrecre me ( C0 
Ce ae SY Co 146" 
ey) .20-.25- "30" 
Fig, 95: ck hah utahensis 
Chief Distinguishing Characters. Relative sizes and color of the dorsal 
tubercles, predominantly the pair on abdominal III (dark, stout and joined at 
the base), pale general colors of body with fuscous thorax and dark lateral areas 
on abdomen and dark antennal I, II and VI, large size of body (1.5-2) and 
antenna (about 4) and only slightly swollen cornicle. 
This species is very close to Drepanaphis spicata Smith and apparently dif- 
fers only in somewhat smaller size and usually shorter dorsal tubercles, anten- 
nal and cornicle measurements. However, as the limits of variation of these 
parts overlap no certain line of separation can be drawn. 
Genus Drepanosiphum Koch 
Koch, 1855:201; Baker, 1920a:32. ~- 
Characters. Frontal tubercles distinct. Antenna longer than the body, with 
minute hairs; unguis many times longer than base of VI; secondary sensoria 
large, oval and ciliated. Cornicle more than five times as long as wide, slightly 
swollen, smooth. Cauda knobbed; anal place indented in vivipara. Ovipara 
with terminal abdominal segments elongated to form ovipositor. Living on 
foliage. 
Genotype (fixed by Lichtenstein, 1885:175) Aphis platanoides Schrank. 
Key to Species of Drepanosiphum 
1. Cornicle swollen slightly on distal half; sensoria on II of alata 
abOUtEZO Gp spS O05. 2 mies ee eee Ser Se Re en a en nae ee Te Oe, Nee eee platanoides 
Cornicle not swollen; sensoria on III of alata fewer than 15 
(Pe BB.) ec ckc hese ag se ES Be ae se ee braggii 
Drepanosiphum braggii Gillette 
Drepanosiphum braggii Gillette, 1907; 393; Gillette and Palmer, 1931:914. 
Fundatrix. Alate. Similar to summer vivipara. 
Alate Summer Vivipara. Pale yellow to greenish with tinge of brown on head and prono- 
tum and yellow-brown on meso- and metanotum; ocelli surrounded with brown; appendages 
pale to brownish at tip of segments; cornicle pale at base, brownish to blackish at tip; wings 
hyaline, stigma pale, bordered with brown. Body length 3; hind tibia 2.80; hind tarsal II 
.15-.19; antenna 4.3-6.3, secondary sensoria oval-transverse and ciliated. Cornicle cylindrical, 
somewhat constricted before flange and gently curved outwards. Rostral IV+V .15, barely 
attaining 3d coxa. Hairs slightly capitate and short. 
Ovipara. Apterous. Dusky olive-green fading anteriorly and posteriorly to pale sordid 
greenish; cornicle pale brown; appendages colorless with tips of tarsi and of antennal seg- 
ments blackish. Body length 3.8; antenna 5.55; hind tibia 2.22. Terminal abdominal segments 
prolonged to form distinct ovipositor. Hind tibia hardly swollen but bearing numerous 
sensoria on proximal half. 
Male. Alate. Similar to vivipara except 2-4 short black bands on abdominal III, IV, V 
and VI. Body length 2; antenna 5.2, 
