198 - APHIDS OF THE ROCKY MOUNTAIN REGION 
Collections. On winter host, on leaves of willow (Salix laevigata); on sum- 
mer host, on leaves of cowparsnip (Heracleum lanatum). Colorado: Eldora, 
Cameron Pass and Fort Collins. Utah: Spring Hollow and Logan. Idaho: Fish 
Haven. Apterous and alate viviparae from June 18 to Aug. 21; rather common. 
Type. U.S.N.M., No. 59909. 
This species is very close to C. pastinacae (Linnaeus) according to Theobald 
but differs from Theobald’s description (1927:13) as follows: Length of antenna 
of apterous vivipara (half, not third of length of body), length of cornicle of 
apterous vivipara (longer than III-++IV, not “nearly equal”), length of cornicle 
of alate vivipara (3 times cauda, not “twice’’) and length of unguis (3-4, not 1.5, 
times length of base of VI). 
Cavariella hendersoni Knowlton and Smith 
Cavariella hendersoni Knowlton and Smith, 1936¢:776. 
Alate Vivipara. (Mounted on slide), head and thorax black; abdomen with dorsal bands, 
coalescing on III, IV and V, short dashes on VI and VII and ventral dashes on I, IV and 
VIII black; antenna except base of III, tips of tibiae, entire tarsi, cornicle, cauda and termi- 
nal segments of rostrum blackish to black. Body length 1.70-1.90; across eyes .35-.40; antenna 
.90-.95; hind tibia .75-.80; rostrum attaining 2d coxa. 
Dorsal Tubercle 
p GUTS Og 50.8 " i 
e! : . : 
Lyd fea 
= ae Hata. 12 =n 8 
Fig. 229. Cavariella hendersoni 
Collections. On willow (Salix sp.), on leaves. Utah: Hooper, Ogden and 
West Webber. Alate viviparae June 7 to October 3; rare. 
Chief Distinguishing Character. Presence of sensoria on IV. 
Type: Knowlton Collection. Paratypes, U.S.N.M. 
[Genotype Cavariella pastinacae (Linnaeus) | 
Aphis pastinacae Linnaeus, 1758:451 and 259 and 1767:734. 
Cavariella pastinacae Theobald, 1927:13. 
Apterous Summer Vivipara. (On Salix) green to yellowish green; appendages pale to 
dusky. Body length 1.8-2; antenna not reaching 2d coxa, III longest, not quite as long as 
IV+V-+VI, IV less than third of III and a little longer than V, VI equal to IV+V; base 
of VI a little longer than IV; unguis 1.5 times base; rostrum attaining to or past 2d coxa; 
cornicle nearly equal to III+-IV; cauda half as long as cornicle, bearing 3 hairs on each side; 
legs short and thick. Dorsal body surface shagreened. 
Alate Vivipara. Head and thorax black; abdomen yellowish green with dark dorsal patch 
or transverse bands; antenna deep brown; cornicle dusky at apex, paler at base; tarsi and 
tips of tibiae brown. Body length 2.5; antennal III much the longest, IV and V nearly equal, 
base of VI not half of V,-unguis as long as IV-+-V-+base of VI, secondary sensoria markedly 
tuberculate, on III only. Cornicle clavate. Supracaudal process prominent but small, knob- 
like, bearing 2 apical hairs. Cauda thick, bearing 3 hairs on each side. 
Hosts. Willow (Salix sp.), parsnip (Pastinaca sativa), carrot (Daucus carota) 
and many wild Umbelliferae. 
Data for above description obtained from description by Theobald (1927:13). 
(Not recorded from region.) 
Cavariella theobaldi (Gillette and Bragg) 
Aphis theobaldi Gillette and Bragg, 1918a:92. 
Cavariella theobaldi, Gillette and Palmer, 1932b:468. 
Apterous Summer Vivipara. Yellowish or pale greenish; cornicle and cauda yellowish; 
antenna pale except VI and tip of V; legs pale with tarsi and tips of tibiae blackish. Body 
length 1.60-2; hind tibia 1; antenna 1.20. Dorsal integument shagreened. 
Alate Vivipara. (Mounted on slide), head and thorax blackish; abdomen pale with dorsal 
bands and lateral areas dusky; antenna dark; cornicle and cauda pale dusky; legs mostly pale. 
Body length 1.50-2; hind tibia 1.10; antenna 1.15-1.50, secondary sensoria tuberculate and 
strongly convex; rostrum attaining between 2d and 3d coxae. Hairs blunt, drooping, sparse, 
