406 
APHIDS OF THE ROCKY MOUNTAIN REGION 
E.—Tibial hairs not longer than 2 times diameter of tibia; dorsum 
with speckles coalesced into bands and blotches. (p. 14)........--....----.----- 
ee ae eer The Green and Brown Pine Needle Aphid (Essigella fusca) 
EE.—Tibial hairs in aptera 2 to 4 times diameter of tibia; dorsum 
marked -with*speckless\ (pit14))2.02. 2. ae eco 
SS OO RT. eee The Monterey Pine Aphid (Essigella californica) 
AA.—On cones. Rostrum acute, lancelike; cornicle on small shallow cone, diameter 
third to half length of hind tarsal II; body brick-red, without powder; tibial hairs 
erect, .09 to .11, once to twice length of diameter of tibia. (p. 27)....--------.--.----s-eceeeeeeeeeneeees 
oe aR Le pocetecendescsraterarcncsnacecasuecassseteacacseesecccienemees Le Pine-cone Aphid (Cinara oregonensis> 
AAA.—On bark of twigs and small limbs. Rostrum lancelike; cornicle mammiform 
on hairy cone; body brown to black. 
B.—On bark of tender tips head down between bases of clustered needles, soli- 
tary; ticklike in action; body yellow-brown to dusky brown; cornicle bearing 
scattered spinelike hairs and numerous short fine hairs; hairs on hind tibia .07 
to .10, as long as diameter of tibia in aptera; .09 to .12, 1.5 to 2 times diameter in 
alata os (p47) coe eee eee ce ee ne The Ponderosa Pine-tip Aphid (Cinara solitaria) 
BB. On bark of twigs, not confined to tips, not solitary, not ticklike; body 
dark brown to black; cornicle bearing only one kind of hairs. 
C.—Body blackish, without powdery markings; hairs minute on dorsum of 
body; on hind tibia about as long as half the diameter of tibia in aptera; 
rostral IV’ .24 to :28; longer) than hind tarsal II. (pi31) 2222 
See sy ty ete Ds Bite See ier The Glabrous Ponderosa Pine Aphid (Cinara glabra) 
CC.—Body brown and black with powdery markings; hairs not minute on 
body. 
D.—Hairs slightly capitate; body blackish, marked with patterns of 
powdery spots; length 4.5 to 5, very large; rostral IV .23 to .25; tibial 
hairs .06 to .08, less than two-thirds diameter of tibia. (p. 23)................--.. 
eee oe Mg | ete Me WR ME NEL ae SE as rm 9 The Giant Pine Aphid (Cinara arizonica) 
DD.—Hairs simple; body length less than 4. 
E.—Body dark brown with black areas and powdery markings; 
rostral IV .20 to .23. 
F.—Tibial hairs fine, very drooping, numerous, short, .03 to .05, 
shorter than diameter of tibia in aptera; .05 to .07 about equal to 
diameter of :tibia in alata; (p.c45)22225.02......2 eee 
The Short-haired Mottled Ponderosa Pine Aphid (Cinara schwarzii) 
FF.—Tibial hairs moderately fine, nearly erect, rather numerous, 
.07 to .08 long, shorter than diameter of tibia in aptera; .08 to .10, 
longer than diameter of tibia in alata. (p. 41) -..--.......c.cecccceceeeceeeeeeees 
SEI PO REM OPE, Wer el ena Rie es ein Bea ES Da Cinara pseudoschwarzii 
EE.—Body golden brown, metallic, with black spots and broken 
pattern of pulverulence; rostral IV .18-.21; tibial hairs somewhat 
spinelike, rather sparse, at angle of 45 degrees, .05 in aptera, .07 to 
.09 in alata. (p. 40)................ The Golden Pine Aphid (Cinara ponderosae) 
Pinyon Pine, Mexican—see Pine 
Plum (Prunus sp.). On leaves and twigs. 
A.—Frontal tubercles exceeding vertex; antenna at least as long as body. 
B.—Frontal tubercles with fingerlike projection; sensoria 23 to 27 on III of alata. 
C344.) sees oe, ok ae cea eek ee ate The Hop Aphid (Phorodon humul1) 
BB.—Frontal tubercles not with fingerlike projection; sensoria 10 to 15 on III-of 
alata:=(p.. S40) zene eee ee een ace The Green Peach Aphid (Myzus persicae) 
AA,—Frontal tubercles not exceeding vertex; antenna shorter than body. 
B.—Cornicle cylindrical, with flange; body brown or green with dorsal dark patch 
in alate vivipara; not powdery. 
C.—Cauda short, hardly longer than broad, shorter than base of VI; body 
pale green with dark dorsal patch in alata. Rostral IV-+V slender. Hind 
wing with both cross-veins. 
D.—Cornicle smooth with circular depression next to flange, shorter 
than twice length of hind tarsal II; sensoria present on IV in alata; 
rostral IV+V .10 to .12 long, coequal with base of antennal VI. (p. 142) 
Sklndessdandh cet eee ae OPC aes The Leaf-curl Plum Aphid (Aphis helichrysi) 
