70 APHIDS OF THE ROCKY MOUNTAIN REGION 
Callipterus caryae Monell, 1879:31. 
Monellia caryae, Davidson, 1914b:19; Gillette and Palmer, 1931:895. 
Alate Vivipara. Pale yellow often with pair of lateral lines on pronotum and dusky spots 
on abdomen; antenna pale and banded; wings hyaline, stigma pale yellow. Body length 
1.3-1.5; hind tibia .80; hind tarsal II .10; antenna 1-1.2, secondary sensoria oval-transverse. 
Hairs pointed and inconspicuous. Rostrum attaining about to 2d coxa. Fore wing with media 
twice-forked; radial sector faint. Nymph. Hairs on body capitate, .09 long. 
Male. Alate. Abdomen with dusky bands on dorsum of each segment. Body length 1.3; 
hind tibia .55; antenna .90-.97. 
Ovipara. Apterous. Marked with speckles. Body length 1.3-1.4; hind tibia .45-.60; an- 
tenna .75-.93. Hairs capitate and .09 long on body. 
Collections. On leaves of Carya sp. and Juglans regia and J. sp. Colorado: 
Fort Collins, Boulder, and Denver. Utah: Hurricane, Lake View, Rockville and 
Vineyard. Alate viviparae June 10 to Sept. 4, sexuales Sept. 24 to Oct. 18; rather 
common where host occurs. 
Type. Davis Collection. 
Genus Myzocallis Passerini 
Passerini, 1860:28; Baker, 1920a:29. 
Characters. Frontal tubercles indistinct; vertex produced in alata. Antenna 
with minute hairs; unguis longer than half of base of VI; secondary sensoria 
usually absent in aptera. Fore wing usually with radial sector faint and media 
twice-forked. Hairs usually capitate on body and conspicuous in aptera, and 
nymph, pointed and inconspicuous in alata. Cornicle short, truncate, and more 
or less widened at base. Eye with ocular tubercle. Cauda knobbed; anal plate 
bilobed, not divided. Rostrum moderately obtuse. Living on leaves. 
Genotype (fixed by Passerini, 1860), Aphis coryli Goeze. 
Key to Species of Myzocallis 
1. Without spinelike dorsal tubercles 2::...2256siicccck ecco ore eee 2 
With ‘spinelike dorsal tubercles’ oo... nero ne nee neem nee 8 
2; Fore wing with dark bands (on Quercus)? 22022). S ook Bocene arccc cnn teres cere 3 
Forewing hyaline) c.x:26 os.seoeccstices ne ee et a, ee ee ep begcouele 4 
3. Cornicle dark; unguis 2 or more times as long as base of VI; secondary sensoria 
6-10 on: TTT of ‘alata Cp t72) ec ee ee ee Ae ees oe discolor 
Cornicle pale; unguis hardly twice as long as base of VI; secondary sensoria 2-6 
onILl’ of alata: (pie 70) i cccck ee ee ene eae ee ey alhambra 
4... VI with unguis longer than base <.ccsdetedseescccd ence cel he censnetes deessvenecehecseftye ste ee 5 
- ViI-with unguis not-longer than DaSe qcci:2.2:-5sccs: ccs beccneeecncncecee op seeep nee eee ee 6 
5. VI with unguis about 2-3 times as long as base; III of alata with about 3 secondary 
sensoria (on: Corylus) (p. 72). 2...0 22.4.5. a ea eee coryli 
VI with unguis about twice as long as base; III of alata with 6-10 sensoria (on 
Qwercus) (Cp. 74). eves ee ce A cers oa ae ee ed re aS punctata 
6. Diameter of cornicle at base at least twice that at tip; body hairs of aptera not 
noticéably capitate) Com Tilia) > Cpe 43) osteo sc e ce ee e tiliae 
Diameter of cornicle but slightly dilated at base; body hairs of aptera 
noticeably capitate: ‘ssi.t:sescys sce c lccttegesectcdd Beare dae tee tone Ae aeons aha case te ee, see cena dear se eer 7 
7. Cauda elongated; antenna of aptera with secondary sensoria (on Ononis and 
Trifoliumy (Not recorded from Tes vO mys eer eee eee ge ononidis 
Cauda globular; antenna of aptera without secondary sensoria 
Con! Robsniaye | (pl 24 Ya ccccsshiccctees eee eae cages hoes near hte eo 
8. VI with base about equal to unguis and more than twice as long 
as-cornicle, eps 75)! cee: ee ee ic eee eee ie) no Ra ulmifolii 
VI with base shorter than unguis and barely twice length of cornicle. (p. 73)........ maurer! 
Myzocallis alhambra Davidson 
The Western Dusky-winged Oak Aphid 
Myzocallis alhambra Davidson, 1920:176; Hottes and Frison, 1931a:255; Palmer, 
1936:747. 
Myzocallis discolor Monell, (misidentification), Knowlton, 1929c:39. 
Myzocallis discolor var. coloradensis Gillette and Palmer, 1931:890. 
Alate Vivipara. Head and thorax dark; abdomen yellowish and marked above with 
