•82 



J. DAVIDSON. 



First Larval Instar has 4-segniented antennae, with sensorium on segs. 4 and 5 ; 

 tubercle-Uke cornicles ; small obtuse cauda and stout legs. 

 Second Larval Lnstar has 5-segniented antennae. 



Fig. 1. Aphis rumicis, Linn., fundatrix : (1) dorsal view ; 



(2) antenna ; (3) rostrum ; (4) posterior end of venter, a.p., 



anal plate, g.p., genital plate, c, cauda ; (5) tarsus of third 



leg, p, empodium or pad ; (6) cornicle. 



2. Apterous Viviparous Female (fig. 2). Average size 2-5 mm. by 1-6 mm. 

 Body elongate oval ; colour variable, black to olive-green, often with irregular 

 darker pigmented areas over the abdomen ; small hairs scattered over the body. 



; n,. / 



Fig. 2. Aphis rumicis, Linn., apterous viviparous ^ • 



(7) dorsal view ; (8) antenna ; (^) rostrum ; (10) cauda, 



dorsal view, a.p., anal plate, g.p., genital plate; (11) 



cornicle ; (12) tarsus of third leg, p, empodium. 



