Walnut aphids in California . ment and articulations of joints3 to 6 dusky black. Eyes bright segments and wing padslight yellow, wing pads projectingout from the body at a very acuteangle. Legs pale, tarsal apices beset with long capitate spinesin four rows. Cornicles on segment 6of the abdomen, hardly perceptible,broader than long. Cauda blunt, conical, and short. Cornicles and cauda concolorous with the abdomen. Beakpale, reaching to the middle coxae. Measurements: Length of body (average), ; width of body (average), mm.; antenna, joint I, mm.; join
Walnut aphids in California . ment and articulations of joints3 to 6 dusky black. Eyes bright segments and wing padslight yellow, wing pads projectingout from the body at a very acuteangle. Legs pale, tarsal apices beset with long capitate spinesin four rows. Cornicles on segment 6of the abdomen, hardly perceptible,broader than long. Cauda blunt, conical, and short. Cornicles and cauda concolorous with the abdomen. Beakpale, reaching to the middle coxae. Measurements: Length of body (average), ; width of body (average), mm.; antenna, joint I, mm.; joint II, ; joint III, mm.; joint IV, mm.; joint V, mm.; joint VI, ; filament, mm. This pupa is distinguishable from that of Chromaphis by the pres-ence of the dorsal rows of spines and by the absence of the blackfemoral spots. The penultimate instar occupies on the average fouror Rve days. At its termination the final molt occurs, and after thisthe insect has acquired its full Fig. .— Monellia caryse:female. Pupa of winged(Original.) viviparous 22 BULLETIN 100, U. S. DEPARTMENT OF AGRICULTURE. THE WINGED VIVIPAROUS FEMALE (FIG. 10). General color pale lemon-yellow; many examples are greenish yellow and othersdecidedly pinkish. Head, thoracic lobes, and scntellum pale brown or yellowishbrown. Eyes pink. Antenna? on small frontal tubercles, about half as long as thebody, pale yellow, with articulations of joints III to VI black; joint III the longest,not noticeably thickened basally; joint IV slightly longer than V and barely as longas joint VI, together with its spur or filament. Bases of antennae encircled, in themajority of individuals, with a narrow dusky ring. Close to the lateral margins ofthe prothorax and roughly parallel to them occur two narrow black lines. (These aresometimes absent.) Wings of moderate size; costa, subcosta, and stigma pale yellow-ish green, other veins light brown, of medium thickness. Stigmatic vei
Size: 1542px × 1620px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidwalnutaphidsinca100davi
