Februarj', '14] DAVIDSON: PLANT-LOUSE NOTES 129 



annihilated the colony of lice, but on Maj^ 30, a few dimorphs appeared. 

 These probably belonged to the third generation. Habitat; Walnut 

 Creek, Cal. 



Euceraphis betulce Kalt. 



Stern mother: General color apple green. Body clothed with short bluish-white 

 pulverulence (much less than in the winged female of later generations). Head olive 

 green with a central black longitudinal stripe. Prothorax, thoracic lobes and scutellum, 

 olive green. Eyes dark red. Antennae on frontal tubercles, a little longer than the 

 body, black (joint I, green); basal third of joint III, thickened to include about 16 

 transversely-oval sensoria; joints IV and V with the usual apical sensoria. Wings 

 large and narrow; stigma long, very pale yellow; sub-costa dark brown; stigmatic 

 vein entire and deeply curved. Legs yellowish-gi-een ; tarsi, apical third of tibia?, 

 apical third of middle and hind femora, brownish-black. Abdomen with almost 

 parallel sides, not wider than the thorax; color apple green with three dusky cross- 

 bands on the dorsum. Cornicles pale yellow, almost twice as long as broad at the 

 base, slightly constricted in the middle. Cauda globular, concolorous with the body, 

 slightly longer than the cornicles. Beak reaches midway between first and second 

 coxae, pale. Sterna brown. Measurements: Body, length, 3.20mm.; body, maximum 

 width, 1.11mm.; wing expanse, 9.37mm.; cornicles, .128mm.; cauda, .150mm.; 

 antennae, joint I, .157mm.; joint II, .085mm.; joint III, 1.50mm.; joint IV, .814mm.; 

 joint V, .588mm.; joint VI, .205mm.; filament, .129mm.; Hind tibiae, 2.17mm. 



The newly-hatched stem mothers are brownish-yellow with pale 

 yellow appendages, thus differing from those of later generations which 

 are bright green. The pupae of stem mothers are reddish-yellow with 

 dusky cornicles and four longitudinal rows of dusky spots on the 

 dorsum. 



Young stem mothers were observed to hatch from winter eggs as 

 early as the middle of February, while the leaf buds did not open until 

 March 1, the lice feeding entirely on the stalks. In California this 

 species occurs on cultivated birches. 



Eucallipterus arundicolens Clarke. 



Winged viviparous female: Pale yellow; head pinkish; eyes dark red. Head with 

 a median dorsal brown stripe. Prothorax pale with median brown stripe, and with 

 two lateral longitudinal brown stripes on its anterior half. Each lateral thoracic 

 lobe with a median brown stripe. Scutelliun pale with the outer ends brown. Abdo- 

 men narrow, oval, pale yellow with a pair of dark brown tubercles on segments 2 

 to 8 inclusive; 9th segment with a brown median spot or stripe. Cornicles as broad 

 as long, dark brown. Cauda pale, globular, about as long as the cornicles. Append- 

 ages; antennae about as long as the body, on frontal tubercles, pale yellow; joint I, 

 reddish; joint II and basal half of III, dusky; apices of remaining joints and whole 

 of filament dusky; joint III is longest; joint VI is longer than the filament; joint V 

 is longer than VI and its filament combined; five to eight transversely-oval sensoria 

 occur on basal third of joint III and the usual terminal are to be found on joints V 

 and VI. Wings considerably exceeding the body in length; stigma, pale greenish- 

 yellow, long, narrow; stigmal vein, absent in the middle; veins, brown; second fork 

 of third discoidal nearer to first fork than to wdng apex. Legs, pale yellow throughout. 

 Beak, reddish, reaching to first coxae. Head on underside, reddish. Sterna yellow. 

 Anal plate deeply lobed. The antennae alone have a white powdery covering. Meas- 



10 



