530 Pomona College Journal of Entomology 



Aphis nerii Fonscolombe 

 1841 Aphis nerii Fonsc, Ann. Soc. Fr. X, p. 157. 

 OLEANDER APHID 



WINGED VIVIPAROUS FEMALE (Figure 17- A) 



Lengtli of body 2.2 mm., width of mesothorax 0.6 mm., greatest widtli of 

 abdomen l.I mm., wing expansion 6.8 mm. 



Prevailing color — Deep rich yellow and black. Head — Narrower than pro- 

 thorax, wider than long, dark. Eyes — Dark red. Antennae — (F'igure 172 C). Black 

 throughout, on a slight frontal tubercle, sparsely haired, reaching to base of the 

 cornicles, lengths of articles: I, 0.09 mm.; II, 0.05 mm.; Ill, 0.48 mm.; IV, 0.38 

 mm.; V, 0.26 mm.; VI, 0.54 mm. (spur 0.42 mm.); total 1.80 mm.; ten circular 

 sensoria on III. Rostrum — Reaching to third coxa, yellow with dusky base and 

 tip. Prothorax — Yellow, with lateral tubercles. Mesothorax — Yellow with muscle 

 lobes black. Metathorax — Dusky yellow with muscle areas dark (see drawing). 

 Abdomen — Smooth, bright saffron yellow with a black blotch behind each cornicle 

 and in some instances there may be small dark patches on the dorsum. Cornicles — 

 (Figure 172 D). Black, margins slightly serrate, cylindrical, with base slightly 

 wider and gradually narrowing to tip, length 0.45 mm., width at base 0.12 mm., 

 width at apex 0.08 mm. Legs — Normal, coxae of first and second pairs yellow, of 

 third pair dusky ; femora yellow witli apical one-lialf black ; tibiae with extreme 

 bases and tips black ; tarsi black. Wings — Hyaline, normal. Primary — Costal 

 vein wide, dusky ; subcostal wide, yellow ; stigma long and narrow, dusky ; stigmal 

 vein well curved ; first and second discoidals nearly straight ; third discoidal nearly 

 straight with first branch arising near its middle, second branch arises nearly 

 two-thirds distance from the base to the apex of the first branch; length of wing 

 S.2 mm., width 1.1 mm. Posterior — Normal, with extreme base of first discoidal 

 obsolete, length 1.55 mm., width 0.5 mm. Style — (Figure 172 E). Sickle-shaped 

 black or dark brown, not quite half as long as cornicles. Anal plate — Dark. 



APTEROUS VIVIPAROUS FEMALE (Figure 172 B) 



Length of body 2.2 mm., greatest width of abdomen 1.1 mm. 



Prevailing color — Clear, bright saffron yellow. Head — Nearly as long as 

 broad, dusky yellow. Eyes — Dark red. Antennae — (Figure 172 F). Not reaching 

 to bases of cornicles, dusky with base of article III light, lengths of articles: I, 

 0.1 mm.; II, 0.08 mm.; Ill, ()..'?6 mm.; IV, 0.28 mm.; V, 0.25 mm.; VI, 0.57 mm. 

 (spur 0.47 mm.), total 1.64 mm. Rostrum — Reaching just beyond second coxae, 

 dusky with tip and base slightly darker. Thorax — Yellow. Abdomen — Smooth, 

 shiny, yellow throughout. Cornicles — (I'igure 172 G). Cylindrical, slightly wider at 

 base, margins serrate or rough, carried nearly at right angles to the body, length 

 0.47 mm., width at base 1.11 mm., width at mouth 0.08 mm. Legs — Coxk dusky 

 yellow ; femora with basal one-quarter yellow and apical tlirce-quartcrs dark ; 

 tibiae dusky yellow with bases and apices darker; tarsi dark, small. Style — (F'igure 

 172 H). Conical, sickle-shaped, black, half as long as the cornicles, length 0.24 

 mm. 



