SUBFAMILY APHINAE 335 
Chief Distinguishing Characters. Shortness of antennal segments (unguis 
two-thirds of III, III little longer han distance across eyes), length of cornicle 
(coequal with III), length of tibial hairs (equal to or exceeding the diameter of 
the tibia, .03-.035 in alate, .04-.05 in apterous vivipara), length of rostral IV-+V 
(.13-.15) and length of the reticulated area of cornicle, about fourth of cornicle 
length). 
Genus Myzus Passerini 
/ Passerini, 1860:27; Baker, 1920a:57; Mason, 1940:3. 
Characters. Frontal tubercles prominent and converging or gibbous, espe- 
cially in aptera. Antenna six-segmented, I gibbous; secondary sensoria subcir- 
cular. Hairs blunt to slightly capitate, inconspicuous on appendages, much 
shorter than diameter of segments bearing them. Cornicle rather long and sub- 
cylindrical to slightly clavate. Cauda short and tapering, rarely parallel-sided. 
Rostral V indistinct. Lateral tubercles lacking. Ocular tubercle present. Fore 
wing with media twice-forked; hind wing with both media and cubitus. 
Genotype (fixed by Passerini 1860), Aphis cerasi Fabricius. 
Key to Species of Myzus 
1. Cornicle with transverse striae or weak reticulation at tip..................:-.c--cscccecccecceeceeeseneeeeeeees 2 
OrniClenwithoOut StrideOreretectl) atl One cscs cc se osc tess een ceca seceee ic deaew eet tate ecteseeon doce 4 
2. Unguis not longer than III; sensoria present on IV in alate vivipara (p. 342)........ porosus 
Unguis longer than III; sensoria absent on IV in alate vivipara.............2....---.:--ccceeeeeceseeeees 3 
3. Cornicle with 1-2 transverse striae or transverse reticulations; apterous 
Vivi nararwith sensorial present Onwl LL. (p). S42) ac-cec<cencsnqncetascteceaacoensmcea-cencatnactedadccsscceseeteasccee solani 
Cornicle with faint hexagonal reticulations; apterous vivipara without 
SOHO ALOT L ULC DS 44 eter eases cesete eat ses aa cee oa average sees ocease bor Scie sauce oe ok ese emnstnebipaetbecoastbones wakibae 
AeeEETinGEtarsal Mim one erst hat TOStha | LV at V cece csentccsecees ccocen neo oeccsec cece coe sock scssuseccsbeugaseacacaspoxssene)idesseencs 5 
Hind itarsal il -not longer than: costral 1 Viq-V -1ce0cs0taccnecucccecesauecscecaspeay side saceseaceconouustecesescecaceacesscs 6 
5. Sensoria 6-11 on III in alate vivipara; absent in aptera; III not longer than 
FAO aT OStlalel Viet7 Vi HOt DEOAd (ps SOS) se tact ee casa are eke ees Sa see a dacasandh cb nsenvedbsten Jeucocrini 
... Sensoria 5-12 on III of alate vivipara, 2-3 in aptera; III longer than .40; 
OSCE ATELY 1 VDE OAC aC DSi Seer ce aes ocean ke a ote: eee gt as oe ee oy timpanogos 
Sensoria 10-15 on III in alate vivipara; absent in aptera; III longer than 
PAO MELOSt halal V1 V PmOteDLOad 2 (pr S40) eter coke cece acc rae ec atc cee tonncce tance cu snsev Sea caso cack stectcaken persicae 
EC OCTIC TES WOOLLEN CP). 5.59)) ean cetecs erect tae ace n acct ceat ea ateete ee tan oadeve sasetcnneee socbcsendacs robtearc eh cSedebente monardae 
MS OPTIC] CYTES WO] Ler ig sc sec ce cree Ree oe ae a ce en eee caw cet rata te web aoe Ravnignceeeanecansn acct cces caredenceee 7 
7. Unguis much longer than III; cornicle not longer than IV (p. 336).................. circumtlexus 
PU news as above--cornicle longer than al V (pr 344) sxc-ccecccgenestececcansecessctovtescsuccscocsvsnteeests wakibae 
PemMU RE RUMPULEMTSTCIETECIRL OC TAVAIE A LS oe taccpee rope cutee catean acemed otto esa eousasereweed onse oussneysetecibnassh<becutwonshr sanstadswestnasedeoreas 8 
8. Sensoria on III in alata not more than 10; body brown (p. 337)............::---cc:seecesseeeereees Jangei 
.. Sensoria on III in alata more than 10; body not DrOwN...........2...22......s---ccceconeesseceeeeececeeeceensenenes 9 
9. Body light green to rusty; alata with black dorsal patch (p. 338)........2.....---c:--eceeeceeeoeees lythri 
2S tees Groat Ech ral Qed eB ete a ne aa i PERS SN ae he oh cee ae ne ee cerasi 
Genotype Myzus cerasi (Fabricius) 
The Black Cherry Aphid (Plate VII) 
Aphis cerasi Fabricius, 1775:734. 
Myzus cerasi, Gillette and Taylor, 1908a:42; Gillette, 1908d:362; Wimshurst, 1925:85; 
Theobald, 1926:292; Gillette and Palmer, 1934:201; Eighmann, 1936: (life his- 
tory) ; Mason, 1940:6. 
_ Fundatrix. Similar to summer vivipara except as follows: Antenna .75-1.15, III and IV 
often coalesced as shown in figure; when not coalesced, segments similar to summer aptera 
but somewhat shorter; hind tibia .60-.70. 
Apterous Summer Vivipara. Young, Ist Instar. Amber to brown. Adult. Black; shin- 
ing; cauda dusky to black; antenna black on I, II, V and VI; cornicle and tarsi black; tibiae 
yellow except tips; rostrum yellowish to dusky. Body length 1.8-2; across eyes .43; hind tibia 
.95-1.05; antenna 1.25-1.6; rostrum attaining 2d coxa. Cornicle somewhat broader at base and 
constricted just before definite flange, strongly imbricated, curved outward, when at rest held 
against body so that tips converge and nearly touch. Cauda rather broad at base and strongly 
tapering, bearing 2-3 lateral pairs of hairs. Integument of head, antennal I and II and ab- 
domen posterior to cornicles closely granulate or denticulate. Hairs minute, about .01 long 
and sparse on body, and appendages. 
