18 BULLETIN 276_, U. S. DEPARTMENT OF AGEICULTUEE. 
filament of segment VI longest, it being noticeably longer than III; 
segments I and II of a darker green color than body, III with the 
extreme base pale, the remainder of that segment brownish with the 
extreme tip black; IV pale brown at base gradually changing to 
blackish brown toward the apex, the extreme tip black; V and VI 
blackish to black, bearing a moderate number of rather short, fine 
hairs; segment III with 11 to 22 (one apparently abnormal specimen 
had but 9 and 10 sensoria, respectively, on its two antennae), mth an 
average of 15.5 for 36 examples examined, circular sensoria arranged 
in a row but not extending quite to the tip, the distal one-fifth of the 
segment bare, the usual distal sensoria on V and base of Yl. Beak 
Fig. 6. — Macrosiphum pisi: Winged female of viviparous generation, much enlarged; a, antenna, 6, cornicle, 
and c, Cauda, of same, more enlarged. (Original.) 
not quite reaching coxse of second pair of legs. Wings clear, veins 
slender and bro^vnish, the second branch of the media varying some- 
what but usually about equidistant from tip of wing to the point 
where the media first branches; hind wings with normal venation. 
Legs long and slender; femur pal3 green on basal half, becoming 
dusky to blackish toward tip; tibia pale greenish with a faint brownish 
tint and the apex black; tarsus black. Cornicles (fig. 6, h) long and 
slender, reaching beyond tip of cauda, widest at the base, basal third 
concolorous with the abdomen, remainder dusky and the extreme 
tip black, imbricated, and no sign of reticulation at the tip. Cauda 
concolorous with the abdomen. 
