. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WALNUT APHIDES IN CALIFORNIA. 17 oval gray transverse spots on the fifth segment, which are separated by a space equal to their length. Cornicles pale yellow, about as broad at the base as long, very much as in the winged female. Cauda pale yellow, globular, not quite as long as the hind tarsus. Sexual organ pale yellow. Beak pale yellow, slightly exceeding the fore coxas. Sterna black. Sensoria transversely oval, situated in an irregular row as follows; joint III, 11 to 16; joint IV, 5 to 7; joint V, 4 to 5; joint VI,
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WALNUT APHIDES IN CALIFORNIA. 17 oval gray transverse spots on the fifth segment, which are separated by a space equal to their length. Cornicles pale yellow, about as broad at the base as long, very much as in the winged female. Cauda pale yellow, globular, not quite as long as the hind tarsus. Sexual organ pale yellow. Beak pale yellow, slightly exceeding the fore coxas. Sterna black. Sensoria transversely oval, situated in an irregular row as follows; joint III, 11 to 16; joint IV, 5 to 7; joint V, 4 to 5; joint VI, 2 besides usual terminal. * Measurements: Length of body (average), mm.; width of body (maximum), mm.; expanse of wings (average), mm; antenna, joint I, mm.; joint II, mm.; joint III, mm.; joint IV, mm.; joint V, mm.; joint VI, mm.; filament, mm.; cornicles, Fig. -Chromaphis juglandicola: Winged male (appendages of left side removed), a, Left antenna. (Original.) Described from many individuals collected in 1911 and 1912 at San Jose, Cal. Both the male and the winged viviparous female when disturbed have a habit if jumping psyllid-like into the air. Their flight is generally in the form of a long spiral, and when disturbed they fly in an upward direction. EGG DEPOSITION. / As mentioned before, the first sexual females of the year remain longer on the leaves after they have reached the adult state than those developing later. In 1911 eggs were not observed in the field until September, or seven weeks after the first appearance of sexual females. In 1912 some eggs appeared in August. This long period between the first appearance of the sexed females and the 40859°—Bull. 100—14 3. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States.
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
