. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WALNUT APHIDES IN CALIFORNIA. 5 the stem-mother; newly hatched young (pig. 2). Oval, lemon yellow. Eyes red, of moderate size. Antennae 3-jointed, not quite reaching to base of second coxae; joint III nearly three times as long as joints I and II together. Legs comparatively long, entirely pale. Body covered with capitate hairs. Cornicles very small, pale whitish-yellow, hardly raised above the surface of the body. Cauda small, pale, bluntly conical. Beak entirely pale, reaching second coxae. Black knee spots character
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WALNUT APHIDES IN CALIFORNIA. 5 the stem-mother; newly hatched young (pig. 2). Oval, lemon yellow. Eyes red, of moderate size. Antennae 3-jointed, not quite reaching to base of second coxae; joint III nearly three times as long as joints I and II together. Legs comparatively long, entirely pale. Body covered with capitate hairs. Cornicles very small, pale whitish-yellow, hardly raised above the surface of the body. Cauda small, pale, bluntly conical. Beak entirely pale, reaching second coxae. Black knee spots characteristic of this species absent. Measurements: Length of body, mm.; width, mm.; antenna, joint I, mm.; joint II, mm.; ioint III, mm. Almost immediately â after birth the legs and antennae turn dusky gray and the dark abdominal spots appear. In this respect the young of the stem-mothers differ from those of all other generations, for the appendages of the young aphides of subsequent broods never turn entirely dusky nor do the abdominal spots appear so early. THE STEM-MOTHER; 4 DAYS OLD. Yellowish-green, flatly oval, closely appressed to the surface of the leaflet or bud scale. Antennae and legs dusky gray. Eyes circular, red, small. Head, thorax, two proximal antennal joints, and abdomen bearing capi- tate hairs which arise (those of the antennae excepted) from small tubercules situated in the middle of a small, FlG- ^.-Chromaphis jug- , . , . , n ⢠⢠J. i ii t j i â ⢠landicola: Stem-mother,newly circular, dusky area. Antennae 3-jomted, the distal joint etched (Original) the largest. Cornicles very small, erect. Cauda almost as long as the hind tarsus, its apex blunt. Cornicles and cauda concolorous with the abdomen. Beak very pale, reaching second coxae, its extreme apex brown. Under- side of the head very pale yellow; of the abdomen greenish-yellow. the stem-mother; after first molt and just previous to SECOND MOLT. Pale lemon-yellow or yell
Size: 1398px × 1788px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
