Walnut aphids in California . paleyellow, with a dark spot close to the apex of theanterior and posterior femora. (In many individ-uals these spots are absent.) Eyes pink. Thearrangement of capitate spines is as follows: The head bears eight, the prothoraxsix, the mesothorax, metathorax, and abdominal segments 1 to 5, inclusive,four, and abdominal segments 6, 7, and 8 two; these spines appear as four lon-gitudinal rows. Cornicles greenish yellow, broader than long, hardly percep-tible, located on segment 6. Cauda concolorous with the body, globular, armedwith four noncapitate spines, half as l
Walnut aphids in California . paleyellow, with a dark spot close to the apex of theanterior and posterior femora. (In many individ-uals these spots are absent.) Eyes pink. Thearrangement of capitate spines is as follows: The head bears eight, the prothoraxsix, the mesothorax, metathorax, and abdominal segments 1 to 5, inclusive,four, and abdominal segments 6, 7, and 8 two; these spines appear as four lon-gitudinal rows. Cornicles greenish yellow, broader than long, hardly percep-tible, located on segment 6. Cauda concolorous with the body, globular, armedwith four noncapitate spines, half as long as the hind tarsus. Genital plate protrud-ing beyond the cauda, pale, its margin beset with short noncapitate hairs. Beakpale, its extreme tip brownish, just exceeding the second pair of coxae. Measure-ments: Length of body, mm.; width of body, mm.; cauda, mm.;antenna joint I, mm.; joint II, mm.; joint III, mm.; joint IV, mm.; joint V, mm.; joint VI, mm.; filament, Fig. 11.— Monellia caryas: Oviparousfemale. (Original.) Described from many specimens collected at San Jose, during: WALNUT APHIDES IN CALIFORNIA. 25 YOUNG MALE PUPA. Light red in general color; appressed closely to the leaf surface. Dorsum of headin front black, behind gray. Dorsum of thorax gray. Antennas six-jointed (i. e.,with five joints and filament), one-third as long as the body, pale gray. Eyes brightred. Legs pale, femora dusky gray. Mesothorax, metathorax, and first five abdominalsegments each with four black spots in a transverse row. Abdominal segments 6 to 8,inclusive, with two such spots. A single capitate spine arises from each of thesespots. Cornicles imperceptible. Cauda pale, short, conical. Beak pale, tip duskygray, reaching first coxae. FULL-GROWN MALE PUPA (FIG. 12). General color pale brick red; head pale orange. Antennae half as long as the body,seven-jointed, pale yellow, with dusky articulations. Eyes bright red. Legs
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