560 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



seven or eight indistinct transverse brown bars. Cornicles very small, hardly more 

 than a raised rim on surface of abdomen, dusky. Cauda rounded, short, with small 

 hairs at edge. Legs olive green with distal two thirds of the femora and coxae darker. 

 Wings of moderate size, insertions and costa green. Stigma short, protruding into 

 wing at the point where it is joined by the stigmatic vein. First two discoidals rather 

 thick, brown, with their origins close together. Third discoidal with two branches, 

 generally obsolete at its base, second fork equidistant from first fork and apex of the 

 wing. The subcostal vein bends slightly into the wing at the point where it receives 

 the two discoidal veins. Hind wings with two discoidals. Sternum black. Beak 

 not reaching second coxa?, light green. About the first of September winged females 

 began to develop. These contained from five to seven eggs in them at that tilne. 

 Sensoria on antermse as follows: joint III, 7-9; IV, V, VI, each with one apical sen- 

 sorium. All sensoria are transverse. 



Measurements. — Length of body, 1.8 mm.; breadth of body, .75 mm.; expanse of 

 wings, 4.75 mm.; antennal joints I, .06; II, .04; III, .23; IV, .13; V, .12; VI, .11; 

 VII, .04. 



Pupa. — Olive green, younger indi\'iduals pale green and wi,th the compound eyes 

 not fully developed. Antennee one fourth length of body, pale green. Legs pale 

 green, coxaj and femora darker. Wing pads olive green. Cauda and cornicles as 

 in the winged form. Abdomen on the dorsum with seven or eight transverse rows 

 of small brown dots which apparently become the indefinite brown bars of the wi,nged 

 form. Beak very short, olive green. 



Vimparous apterous female. — Before depositing young, greyish-brown, abdomen 

 much distended, with considerable reddish mottling on the dorsum of abdomen and 

 thorax, also with eleven transverse darker bars on dorsum of abdomen and dark 

 areas on head and thorax. Cauda dark brown, rounded, short. Cornicles as in 

 winged female. Antenna; very small, one eighth length of body, four-jointed, pale. 

 Legs short, olive green. Abdomen on the under side with sLx short median trans- 

 verse dark bars. 



Measurements. — Length of body, 2.2 mm.; breadth of body, 1.22 mm.; antennal 

 jomts, I, .06; II, .04; III, .12; IV, .06. 



Newly hatched young. — Very pale greenish white. Eyes red. A row of minute 

 black spots down each side of the abdomen. Antennae three-jointed. 



This aphid occurs in galls on leaves and flower- or fruit-stalks on at 

 least two species of manzanita {Arctostaphylos pumilla and A. tomen- 

 tosa). The red galls show up very prominently on green leaves of 

 the plant. These galls are of two kinds, one on the leaf, caused by the 

 edge being turned over or the leaf being doubled in the middle and a 

 pocket thus formed after the manner of Pemphigus populimonilis 

 Riley, the other formed on the fruit stalk. The latter becomes bullet- 

 shaped and in all the specimens examined contained only one apterous 

 vivipara full of unborn young. In the leaf-galls in August were found 

 only pupae and occasionally the old shrunken, black stem-mother. 

 On the last day of August the pupge began to develop into winged 

 forms, but as I left Lake Tahoe at this date, I could not ascertain 

 how these migrated. 



Taken at Lake Tahoe, Cahfornia, in August, 1911, at an elevation 

 of 6,200 feet. 



