94 APHIDS OF THE ROCKY MOUNTAIN REGION 
Chief Distinguishing Characters. Heavy spines on the body of aptera and 
shape of cornicle. 
Genotype (monotypical), Chaitophorus quercicola (Monell). 
Genotype Hoplochaitophorus quercicola (Monell) 
Chaitophorus quercicola Monell (Jan.) 1879:32. 
Callipterus quercifolii Thomas, 1879:112. 
Chaitophorus spinosus Oestlund, 1886:49. ~ 
Chaitophorus quercicola, Davis, 1910d:415 and 1913:99 and 105 (synonymy); Oé6est- 
lund, 1922:124. 
Hoplochaitophorus quercicola, Granovsky :1933 :32. 
Apterous Summer Vivipara.* Cornicle yellow or slightly dusky; legs mostly yellow with 
knees dusky and hind tibia dusky on proximal half, tips hardly dusky; tarsi dark; antenna 
annulated. Body length 1.8-2; across eyes .40; hind tibia 1.20; hind tarsal II .13. Hairs on 
body including vertex, numerous, consisting of heavy black spines and sparse, shorter, fine 
hairs set on tubercles; on appendages fine and rather inconspicuous. 
Alate Vivipara. Color same as in apterous vivipara and with antenna annulated, I, II and 
VI entirely black. Body length 1.5; across eyes .48; antenna 1.4; hind tibia 1.2-1.4; hind 
tarsal II .13; rostrum barely attaining 2d coxa. Hairs on body, including vertex, fine and 
moderately long and sparse. 
Alatiform Aptera. Same as alate vivipara in size and antennal characters; same as 
apterous vivipara in hairs and spines of the body. 
A\ate /Viv 
ony SS ic Le Nee 
h Fw Alate [co-1) 
Body, a ; Viv. 70 
Hairs 
Fig. 102. Hoplochaitophorus quercicola 
Collections. On leaves of Quercus sp. Colorado: Fort Collins. 
Only one species represented in region. 
Alate viviparae, apterous viviparae and alatiform apterae June 6; rare. 
Cotypes. Davis Collection. 
This species is distinctly outstanding for the same characters as the genus. 
Genus Periphyllus van der Hoeven 
Hoeven, van der, 1863:7; Baker, 1920a:34. 
Characters. Frontal tubercles absent. Ocular tubercle present. Antenna 
six-segmented (except in dimorph); with circular to oval sensoria; unguis not 
shorter than base of VI. Body and usually antenna with prominent spinelike 
hairs. Cornicle short, truncate, usually imbricate or reticulate. Cauda and 
anal plate rounded. Fore wing with media twice-branched. Male alate or 
apterous. Ovipara and fundatrix apterous. 
Genotype (monotypical), Periphyllus testudo van der Hoeven** (syn. of 
Phyllophora testudinacea Fernie). 
Key to Species of Periphyllus 
1. Unguis- not distinctly longer than: base of. VU. sc-.5cc0so-c-6cqceewoncaee= Aoeee--ssedestuecevs-to se 2 
Unguis' longer’ than, base ‘of: VE orca goes ccpcce ccs eo oeeecteiree vanea ese acontas choad aun tae ee 3 
2. Color of body never blackish; wings not smoky; veins not bordered. 
On-bark néari roots).(p. 100) hee ee re a ee ee ee eee salicicorticis 
Color of body dark brown to blackish; wings smoky; veins bordered. 
On-bark: of twigs (p2-98) (ccf. acc eee a eg 8 macrostachyae 
3. Hairs on vertex not longer) thas 10.0225 f Bessette cx cases stsseos wasps. sconces ee 4 
Hairs on vertex longer than ‘10, atleast in’ apt fia .c.ycssecgsecsoteees-sscndcasscescu dh eect ee 6 
*Antennae missing on all specimens at hand. 
**P hillophorus testudinatus Thornton, of which testudo van der Hoeven has been given 
as a synonym by authors, was apparently never published. 
