. Bulletin of the Department of Agriculture. Agriculture. THE PEA APHIS WITH RELATION TO FORAGE CROPS. 13 fourth of V, distal half of VI, base and all of filament of VI, which parts are black; segment III sometimes, but not always, bearing a small inconspicuous sensorium near its base and the usual sensoria at distal end of V and VI base. Beak just reaching coxae of second pair of legs. Legs with femur very pale green and semitranspar- ent; tibia with basal hah pale semitransparent, the distal half with a faint brownish tint and the tip black; tarsus black. Cor- nicles reaching tip of cau
. Bulletin of the Department of Agriculture. Agriculture. THE PEA APHIS WITH RELATION TO FORAGE CROPS. 13 fourth of V, distal half of VI, base and all of filament of VI, which parts are black; segment III sometimes, but not always, bearing a small inconspicuous sensorium near its base and the usual sensoria at distal end of V and VI base. Beak just reaching coxae of second pair of legs. Legs with femur very pale green and semitranspar- ent; tibia with basal hah pale semitransparent, the distal half with a faint brownish tint and the tip black; tarsus black. Cor- nicles reaching tip of cauda (of the four specimens ex- amined the cornicles reached a little beyond the tip of cauda in three speci- mens and not quite to the tip in the fourth specimen), concolorous with body at base, becoming paler and semitransparent toward the apex, the tip blackish; cylindrical and slender; noticeably widened at base and the tip imbri- cated. Cauda ensiform and typical of the genus, and concolorous with body. Measurements from two specimens immediately after placing alive in balsam and before shrinkage occurs: Length of body, mm., to tip of cauda, 3, width, ; length of cornicles, mm., of cauda, Measurements of antennal segments:. Fig. 2.—Macrosiphum pisi: Adult stem-mother. Much en- larged. (Original.) I. II. III. IV. V. VI, base. VI, fila- ment. Mm. Mm. Mm. Mm. Mm. .!//». Mm. - .156 .078 .695 .348 .452 .243 .539 .139 .078 .626 . in; .400 .209 .469 ' .139 .0S7 .634 .296 .400 .209 .469 SUMMER VIVIPAROUS GENERATION. First instar, before first molt and about 1 hour old (fig. 3).—(Described from six specimens, Aug. 20-21, 1912.) Head and thoracic segments whitish with a pale greenish tint; remainder of body pale green excepting those segments posterior to and including the segment. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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