August, '10] DAVIDSON: CALIFORNIAN APHIDIDAE 379 



cornicles. Cornicles long, slender, contracted at base for half their 

 length, clavate, dusky brown, five times the metatarsi in length, 

 extending half their length beyond the tip of the abdomen. Style 

 golden yellow, tapering, about as long as the tarsi, pilose. Legs long, 

 slender, very dusky except for anterior two-thirds of the femora and 

 the coxffi, which are pale yellow. Beak just exceeds third coxge. 

 Wings hyaline, large. Insertions and sub-costa pale greenish yellow. 

 Stigma short, gray. Veins dark brown, first two discoidals robust, 

 third discoidal obsolete at base. Stigmatic vein curved regularly. 

 Second branch of cubitus slightly shorter than the part between the 

 forks. 



Pupa. Pale green. Antennae half again as long as body, green 

 with black tips to the joints. Eyes crimson. Style conical. Abdomen 

 with reddish areas on the sides. Size 1.3 x .55 mm. 



Apterous viviparous female. Pale yellowish-green. Head in the 

 mature insect with reddish tinge, small. Antenna? slightly longer 

 than the body, situated on evident tubercles, pale except articulations 

 and last two joints, which are dusky. Seventh joint almost as long as 

 joints III, IV, and V together. Eyes bright red. Abdomen very pale, 

 oval. Cornicles slightly dusky, clavate, broadest just beyond the 

 middle. Cauda pale, short, conical. Legs pale, concolorous with the 

 body and cauda, tarsi and tibial apices dusky. Beak with a brown 

 tip, reaches third coxie. This species is common throughout the year 

 on the under surface of the leaves of the Madrone {Arbutus men- 

 ziesii). It is quite extensively preyed upon by Braconidge. 



Measurements of the apterous female: Length body, 1.55 mm.; breadth 

 body, .68 mm.; cornicles, .45 mm.; antennae III, .35 mm.; IV, .30 mm.; V, .30 

 mm.; VI, .10 mm.; VII, .80 mm. 



Alate female: Length of body, 2.0 mm.; breadth of body, .9 mm.; expanse 

 of wings, 6.85 mm.; cornicles, .5 mm.; cauda, .2 mm.; antennte III, .5 mm.; 

 IV, .45 mm.; V, .42 mm.; VI, .14 mm.; VII, 1.05 mm. 



Alate female. Pale green, with some indefinite dusky markings on 

 the abdomen. Head, prothorax, scutellum, and thoracic lobes brown. 

 Eyes red. Antennas brown, joints III, VI, VII, and distal half of 

 IV and V dark olive green, on frontal tubercles. Joint III has about 

 20 small sensoria, joint IV about 8 smaller ones. Cornicles brown, 

 clavate, broad at the base then narrowing for half their length and 

 expanding distad, reaching their widest at apical fourth, then slightly 

 narrowing to the apex. Cauda two-fifths the length of cornicles, 

 slightly upturned, concolorous with the abdomen with the tip dusky. 

 Legs long, light brown ; tarsi, distal half of femora, proximal half 

 of tibiae dark brown. Wings large; stigma gray; veins dark brown, 

 thick, the first discoidal with a smoky border, also the second, but the 

 border less conspicuous. Beak pale, the tip black, reaching second 

 coxge. 



Myzu^ rosanim Walk. Taken sparingly in the fall on wild rose 

 (Rosa calif ornica). 



Myzus persicw Sulz. In the spring on peach. 



