196 APHIDS OF THE ROCKY MOUNTAIN REGION 
dages pale. .Adult. Apterous. Head and thorax mostly dusky; rest of body sordid greenish 
yellow with white markings; appendages as in nymph. Body length 1.0-1.25; antenna 1.0; 
cornicle about .06; cauda .05 on median line. Hind tibia slightly swollen on proximal half 
and bearing about 6 large circular flat sensoria. 
Male. Apterous. Head and thorax dusky; abdomen pale green with broken dorsal cross- 
bands and lateral areas; antenna and cornicle blackish; legs mostly pale. Body length 1.25; 
hind tibia .60; cornicle .06; antenna 1.25, bearing numerous sensoria on III, IV and V. 
Egg. Newly laid, pale yellow; later, black. Size .60 by .26. 
Collections. On twigs of Symphoricarpos occidentalis and S. rotundifolia, 
curling leaves. Colorado: Foothills near Fort Collins, La Porte, Bellvue, Boulder 
and Colorado Springs. Utah: Logan, Smithfield and American Fork Canyons. 
Fundatrix May 13, summer apterous viviparae May 13 to Sept. 23, alate vivi- 
parae May 13 to July 1, sexuales Sept. 23 to Oct. 11; fairly common. 
Cotypes. Ill. Nat. Hist. Surv. Collection, Nos. 2792 and 8776. 
This species is the genotype of Thargelia Oestlund (1922:127). The char- 
acters, however, in the opinion of the author, are congeneric with Brevicoryne 
brassicae. 
Genus Cavariella Del Guercio 
Del Guercio, 1911a:323; Baker, 1920a:46; Theobald, 1927:3. 
Characters. Vertex convex; frontal tubercles indistinct. Antenna six-seg- 
mented, bearing prominent circular secondary sensoria in alate vivipara. Cauda 
tapering. Cornicle with flange, opening on tip. Abdomen with supracaudal 
process on VIII; most prominent in aptera. Venation as in genera Rhopalosi- 
phum and Aphis. 
Genotype (fixed by Del Guercio, 1911), Aphis pastinacae Linnaeus. 
Key to Species of Cavariella 
1. Cornicle cylindrical) hardly clavater (pss 198) ccsssesescceees ee eeceee ree reece theobaldi 
Cornicle distinctly clavate w.--224 cece ke 2 
2. Supracaudal process in aptera knoblike, much shorter than cauda; antenna with 
lnguis 1:5 ‘times base of V1 or long eresi-2oncc iene cc ec esc serene sence 4 
Supracaudal process in aptera triangular to fingerlike, as long as cauda; 
antenna with unguis shorter than 1.5 times base Of VI...20........:c.-cccce-cceccececeeeeceeeenenseceeecneerennes 3 
3. LV in alata without secondary sensoria (p> 196) recccrccccccccce-cecnsetcess teerse se eee aegopodii 
-) LV in alata with secondary: sensoria, (p, .198).--. ee ee henderson 
45 Unguis not longer than 1:5 times base of Vil. (sel 98) ecccctesse ees cote eee pastinacae 
Unguis at least as long as 3 times base of VI (p! 197) viccccrce cece ee essigi 
Cavariella aegopodii (Scopoli) 
Aphis aegopodii Scopoli, 1763 :399. 
Rhopalosiphum capreae Fabricius, (misidentification), Gillette, 1911b:320; Theobald, 
1927:10. 
Cavariella aegopodii, Hottes and Frison, 1931a:229. 
Cavariella capreae, Gillette and Palmer, 1932b:466. 
Fundatrix. Head rusty brown; rest of body rusty red; appendages and cornicle pale, with 
tips of antenna and of tarsi black; cauda concolorous with body. Body length 1.80-2; antenna 
.50-.66, III+IV (coalesced) .22-.27, V .10, VI .10-+.06 or in some, entire length of antenna .75, 
III .21, IV .08-.11, V .08-.11, VI .10-.11-++-.08-.10; hind tibia .60-.70; cornicle .40. Otherwise as 
in summer vivipara. 
Apterous Summer Vivipara. Pale green; cornicle, cauda and legs pale to slightly dusky. 
Body length 1.85-2.15; supracaudal process triangular to fingerlike; hind tibia .70-.85; hind 
tarsal II .14; antenna .82-.95; rostrum attaining 2d coxa. Dorsal integument shagreened or 
punctate. 
Alate Vivipara. Head and thorax black; abdomen pale grass-green, with dark lateral 
areas and dorsal bands, beginning on abdominal III and more or less coalesced on III, IV 
and V; cornicle and cauda light dusky; antenna black; legs mostly pale with tarsi and tips 
of tibiae black. Body length 1.2-2; hind tibia .80-.95 antenna 1-1.10, sensoria rather tubercu- 
late. Hairs blunt, sparse; on vertex and antenna .01-015; on tibia .01. Cornicle clavate, at 
middle wider than hind tibia, transversely rugose proximally, faintly imbricated distally, with 
flange somewhat oblique. Dorsal tubercle on abdominal VIII short, blunt, bearing 2 hairs at 
tip. Cauda bluntly tapering, bearing 2 pairs of lateral hairs. 
