16 



BULLETIN" 276, U. S. DEPARTMENT OP AGRICULTURE. 



Adult wingless viviparous female. — (Described from four specimens 

 reared on red clover, Aug. 18-22, 1912.) (Fig. 4.) Entire body pale 

 gradually blackening toward tip; VI dark brown to black; segment 

 green, the anterior part, including head and usually the first and sec- 

 ond thoracic segments, as a rule 

 paler. The red eyes of the 

 embryos within the body are 

 almost always visible through 

 the dorsal body wall. As seen 

 through the binocular the liv- 

 ing individual appears slightly 

 roughened and reticulated. 

 Eyes dark reddish brown. 

 Antennae (fig. 4, a) on prom- 

 inent tubercles; reaching be- 

 yond tip of cauda; filament of 

 segment VI the longest, it being 

 noticeably longer than III; 

 segments I and II concolorous 

 with head; III and IV dusky 



Fig. 4. — Macrosiphum pisi: Adult wingless female of 

 viviparous generation, much enlarged; a, antenna, and 

 6, cornicle, of same, more enlarged. ("Original.) 



greenish to pale brownish, with the 

 tips blackish; V darker, gradually 

 blackening toward tip ; VI dark brown 

 to black; segment III with one or 

 two, and sometimes three, circular 

 sensoria near the base; segments V 

 and base of VI with the usual distal 

 sensoria; hairs short and sparse. 

 Beak reaching to coxae of second pair 

 of legs. Legs long and slender, mod- 

 erately hairy ; femur pale green with a 

 slight brownish tint toward apex, 

 joint of femur and tibia dusky; tibia 

 pale green, with a slight brown is] i 

 tint, and the tip blackish; tarsus 



black. Cornicles long and slender, broadest at base, tip imbricated 

 and no sign of reticulation, just reaching to tip of cauda, pale green 

 at base, paler or with a faint brownish tint toward apex, the 

 extreme tip black. Cauda concolorous with body, onsiforni, and 



Fig. 5. — Macrosiphum pisi: Pupa of viviparous 

 generation. Much enlarged. (Original.) 



