Pomona Com.eoe ,Toi-hnai, of Kntomoi.oov 520 



marpinnl and transverse dorsal inarkings. one pair of small lateral tuhercles near 

 the base of the aliiliinien and a second pair just behind the eornieles, genital plnte 

 dusky. Cornicli-s — (Figure 171 D). C"ylindrieal, inibrieated, wider at base and 

 (gradually narrowinjj to apex, black, three times as lonj? as style, length 0.36 mm., 

 widtli at base 0.07 nun. /.»"^'* — Moderately long and hairy, coxa- dark; femora 

 lemon yellow with apical halves dusky; tiba* lemon yellow with extreme bases and 

 tips dusky; tarsi dusky. Winers — Hyaline, normal. Primari/ — Length .S.4 mm., 

 width I. '2.^ mm., costal and subcostal veins and the stigma dark brown, remaining 

 veins light yellow. Secontlnri/ — Length '2.1 nun., width 0.().5 nnn., veins light 

 yellow. Sli/le — (Figure 171 F,). Conical, black, nearly as long as tarsi. 



M'TEHOi's vivii>.\nors KEMAi.K (Figure 171 ){ ) 



l.iiigtii 1.;) mm., greatest width of abdomen 1.2 nun., sui.ill rolmst species. 



rrrrailing color — Dull green or black with often a shade of mariM>n. many 

 iiidi\ idiials slightly covered with fine white powder, others shinv black. Head - 

 Dull reddish-gr<'en or black. Kiirs — Dark red. .Iiilriinar — ( T'igure 171 (r). Not 

 I'alf as long as the body, on slight frontal tubercles, articles I and II color of head. 

 Ill, I\', and V lemon yellow — the latter with apical one-half dusky, VI dark, 

 lengths of the articles: I, O.O.'. mm.; II. O.Ofi mm.; III. O.I V mm.; IV. O.l.S mm.: 

 \'. 0.1'.' nnn.; \'l. 0..S nnn. (spur 0.'2 unn.); total 0.7 unn. Uostrum Lemon 

 yellow with dark base and tip. reaches to third coxa-. Thorn.r — Dark green, 

 maroon, or black, lighter ventr.-iliy. Ahdomrn- ."somewhat globular, smooth, shinv 

 or dull, varying from dark green or maroon to black, ventral surface lightcT in 

 color, genital plate dusky. Cornicles — (Figure 171 F). Cylindrical, black, shorter 

 than in winged sjiecimens, imbricated, wider at base than at apex, length O.'il mm. 

 f.eas — .Same as in winged s)>ecimens. Sli/lr — ( Fignri- 171 H). Conical, dark with 

 Mack spot at the ventral base, the distance across the base equals the length. 



llost.1 — This s))eci<'S was obtained in rather limited numbers from the floweriti" 

 shoots of the native Rattle Weed or Loco Weed (.l.tlragalii.'i Irucopis Torr). It 

 .ilso feeds u)ion Mrilicnpo falcata. Cara^ana nrhorcsccns, Ilnhinio rincosn, Mrli- 

 lolus ilalicn. Wild Licorice {Gli/ciirrhi:a Icpldola), Aricmisia cafifornica Less., 

 .111(1 Cliivers. 



I.iiiality .Moiig till' foothills of the Upper Oj.ii \',illiy. two miles from 

 NordhotT. at an altitudi of 1.(100 feet. O.it.- of collection .M.iy !.">. 1911. .Serial 

 number STk 



The sjiecies. .as it occurs here, conforms remarkably well with the original 

 description given by Koch, .and there can be little doubt regarding its identity. In 

 the description by Willi;ims { .Vphid. of Nebr. pp ;")0-l) the following difTerences 

 are noted : 



.SpEi lEs DEscRiBEn nv Williams .Species as Fotxn at NonniioKF 



Cornicles of the apterous female Cornicles of the apterous females 



longer than those of the winged females. shorter than those of the winged 



.\ntennal .artiele III of the apterous females, 

 forms longest. .Article \'I and the spur of it (which 



is couunonly termed \'II) is always 

 longest. 

 However, in spite of these rather indefinite differences, I believe this to Iw 

 the true Aphis medicaginis Koch. 



