68 APHIDS OF THE ROCKY MOUNTAIN REGION 
Hairs pointed, .05 on vertex; .02 on body; on hind tibia .05, rather numerous; on antenna 
minute and sparse (in nymph, long and capitate). 
Collections. On Juglans regia, on leaves. Utah: Brigham City, Salt Lake 
City, North Salt Lake, Santa Clara, and Green River. Alate viviparae in July 
and September; at times abundant. 
Genus Euceraphis Walker 
Walker, 1870:2001; Baker, 1920a:28; Theobald, 1927 :372. 
Characters. Frontal tubercles well developed. Antenna longer than body; 
unguis not longer than base of VI; secondary sensoria on III narrow, transverse, 
located near base; absent in aptera; permanent sensorium on VI long, oval and 
fringed. Cornicle truncate. Cauda somewhat knobbed; anal plate entire or 
slightly emarginate. Hairs not capitate, even in aptera. Wax glands often 
present in alata. Fore wing with radial sector distinct. Living on leaves and 
twigs of trees; usually solitary. 
Genotype (set by Walker, 1870), Aphis betulae Linnaeus (syn. Callipterus 
betulae Koch)* 
Key to Species of Euceraphis 
1. Unguis nearly equal to base of VI in length (Jonger than two-thirds 
base) (ps.68)> 22cccscccxccn encase cas ce beeen cnc seu dsc eee sce cam ek ae eared ce oe oa a betulae 
Unguis considerably shorter than base of VI (not longer than two-thirds 
Of bases Cp G8 ): oso oo wc wr cat ces eee nade ca ee ode ce es ee gilletter 
Genotype Euceraphis betulae (Koch) 
The European Birch Aphid 
Tot —— 
125-150 Gen. 18-28) SO nos Mpiess 
C 
Hd.Ta, 
2) 3) 
arnt, 
epee 
Pee 
27-29 21=24 
ps 
é orale AA 
Fig. 68. Euceraphis betulae 
Callipterus betulae Koch, 1855:217; Buckton, 1881:15. 
Euceraphis betulae, Gillette, 1910:371; Baker, 1917a:425; Theobald, 1927:373. 
Alate Summer Vivipara. Head and thoracic lobes brown; prothorax and abdomen yellow- 
green; some with short black dorsal bands on abdominal IV and V; woolly; antenna black or 
blackish; tibiae and tip of rostrum dusky or brown; tarsi black; cornicle, cauda and anal plate 
pale; wings hyaline, veins slightly tipped with brown. Length of body 2.70-3; across eyes 
.57-.60; antenna 4 long, sensoria on III transverse, either broken and crowded or entire; hind 
tibia 2.1-2.3; hind tarsal II .23-.29; rostral IV+V .13, attaining between lst and 2d coxae. 
Cauda knobbed; anal plate slightly emarginate. 
Collections. On Betula alba, on underside of leaves; solitary, and dropping 
when disturbed. Colorado: Fort Collins. Generally in northern Utah and 
southern Idaho. Alate viviparae June 25 to Sept. 25. 
Euceraphis gillettei Davidson 
Euceraphis sp. Gillette, 1910:371, 
Euceraphis gillettei Davidson, 1915:421; Gillette and Palmer, 1931:904. 
Alate Vivipara. Head and thorax pale brownish; abdomen pale apple-green to yellowish; 
without markings; usually with flocculence; antenna annulated; legs pale with tips on tibiae 
and entire tarsi black; cornicle and cauda pale. Body length 2.5-3.5; hind tibia 2.9-4; antenna 
5.2; rostrum attaining between Ist and 2d coxae. Cauda knoblike; anal plate slightly emar- 
ginate. Cornicle constricted in the middle and flaring at both base and tip. Three pairs of 
wartlike to fingerlike dorsal tubercles on abdominal I, II and III. 
*Walker named as _ genotype Aphis betulae Linnaeus but evidently had in mind 
Callipterus betulae Koch. This is not strictly according to rule. However, according 
to Theobald (1927:373) Koch’s species has been accepted by most authorities as being 
the same as Linnaeus’. Linnaeus, however, describes his species as ‘‘lacking wings 
and appendages.” This character does not agree with the concept of this genus. The 
status of the genus Euceraphis is being presented to the International Commission on 
Nomenclature. ; 
