96 APHIDS OF THE ROCKY MOUNTAIN REGION 
Centerville, Logan, Salt Lake City, Setthement Canyon, Blacksmith Canyon, 
Provo Canyon, Springville, Mountain Home and City Cyeek Canyon. Apterous 
summer viviparae May 20 to Sept. 28, apterous fall viviparae Sept. 19, alate 
viviparae May 6 to Sept. 29, dimorphs May 10 to Sept. 2; fairly common where 
host occurs. 
Cotypes. U.S.N.M. 
Statement in original description giving cornicle as .24 is apparently a 
typographical error as cornicle on cotypes measure no more than .15. 
Chief Distinguishing Characters. Length of unguis in adult (.30-.40, about 
the same as IV, in dimorph .18-.20), dorsal plates of dimorph which comprise 
only two median rows ending on abdominal III, length of antennal III (.52-.70) 
and length of hairs on antennal III (.10-.17). 
Periphyllus brevispinosus Gillette and Palmer 
The Colorado Maple Aphid 
Periphyllus brevispinosus Gillette and Palmer, 1930:546 and 1931:921. 
Fundatrix. Body length 2.4-2.50 by 1.50; hind tibia .75; hind tarsal II .15; antenna 1, 
III .33, IV .15, V .15, VI .12+.08-.10. Other characters as in summer forms. 
Apterous Summer Vivipara. Brown, with dark and light mottling; cornicle yellow; 
appendages mostly yellow. Body length 2.40; hind tibia .85; antenna 1.30; rostrum moderately 
broad attaining about to 3d coxa. Hairs as in alate vivipara. 
abellate 
Hair 4100 
vi 
Fig. 104. Periphyllus brevispinosus 
Alate Vivipara. Head and thorax black; abdomen dark brown with dark dorsal bands and 
lateral spots; cornicle blackish; appendages slightly dusky; wings hyaline. Body length 2.25; 
hind tibia 1; antenna 1.55; cornicle .11; cauda .14. Hairs on body and vertex, two kinds, some 
heavy, spinelike, .10-.13 long and others fine, .05; on antenna fine; on hind tibia fine to mod- 
erately spinelike. Rostrum barely attaining 2d coxa. Fore wing with media twice-branched. 
Dimorph. Body length .60; across eyes .23; dorsum without mosaic pattern; antenna .35. 
Flabellate hairs usually with veins slightly protruding beyond margin of flabellum. 
Dimolt (Adult developed from dimorph). (Mounted on slide), body immaculate; ap- 
pendages pale, darker distally. Body length about 2; across eyes .41-.45; antenna 1.20; hind 
tibia .63-.70; hind tarsal II .14; rostral IV-+V .10. Hairs on body of two kinds, heavy, spine- 
like ones .20 long and fine ones .07-.13. 
Ovipara. Apterous. Body length 2.15-2.30; across eyes .43-.45; antenna 1.15-1.25; hind 
tibia .65-.75; hind tarsal II .14-.15; rostral IV+V .09, attaining 2d coxa. Hind tibia consider- 
ably swollen along nearly entire length and bearing numerous sensoria. 
Collections. On leaves of Acer glabrum. Colorado: Skyway, Eldora and 
Idaho Springs. Utah: Logan Canyon. Fundatrices June 3, alate and apterous 
