August, "09] JOURNAL OF ECONOMIC ENTOMOLOGY 399 



KOTES ON APHIDIDAE COLLECTED IN THE VICINITY 

 OF STANFORD UNIVERSITY 



By W. M. Davidson 



This list is but a preliminary one, since the forms have been studied 

 •only during the past year. Doubtless there are many other species 

 in the neighborhood which I have not collected. A few new species 

 have been described, while certain others, showing affinities to de- 

 scribed species but possibly new, have been left unnamed for the 

 present. Two or three European forms not heretofore listed in 

 catalogues from America have been observed, generally on imported 

 plants. 



Fhylloxera vastatrix Planchon; Vitis. 



Very abundant in a vineyard on the campus, doing much damage. 



■Chermes pinicorticis Fitch ; Pinus pmastu maritima. 



On the needles during the fall months. 



C. coweni Gillett; Pseudostuga douglasii. 



In large numbers on a young Douglas spruce. 



Temphigus beta Doane; Rumex occideyitalis (roots). 



P. popidicauUs Fitch ; Populus tricocarpa. 



Common on poplars in the fall, and in March when the stem-moth- 

 ers were founding their colonies. 



Colopha idmicola Fitch; Elm. 



Schizoneura lanigera Haus. ; ' Apple. 



Very common in apple orchards on the campus. 



JLachnus viminalis Fonsc. ; Salix. 



Found in November on the bark of willow. A parasite, Aphidius 

 sp., was reared in considerable numbers. 



X. abietis Fitch; Abies concolor. 



In large colonies in the fall on the limbs. No winged forms were 

 seen. 



L. pini-radiatce sp. nov. ; Pinus radiatce. 



Alate Female 



Length of body 2.2 mm. ; breadth of body .75 mm. ; expanse of wings 7.2 

 mm. ; antennal joints III .48 mm. ; IV .28 mm. V .28 mm. ; VI .23 mm. Very 

 similar to the apterous female. Cornicles dusky, truncate, very short; eauda 

 green, short, conical ; antennae very pilose, yellow, darker at the articulations 

 •of the joints ; wings large ; stigma greyish brown, long, narrow ; basal half of 



