Vol. XXX ] ENTOMOLOGICAL XF.WS. IO3 



Two Species of Phylloxera from California 

 (Hemiptera ; Aphidae). 



By G. F. FERRIS, Stanford University, California. 



The western portion of the United States appears to be very 

 poorly supplied with species of Phylloxera. Aside from the 

 notorious pest of the vine there appear to be but two species 

 known from California, Davidson having recorded P. popularia 

 Pergande from poplars and P. salicola Pergande from willow. 

 I am here describing an apparently new species from oak, per- 

 haps the first to be recorded from oak west of Missouri, and 

 am presenting some notes upon one of the other species. 



Phylloxera stanfordiana n sp. (Text figs. B, D.) 



In life. Occurring upon the twigs of the host, concealed be- 

 neath any chance covering, especially numerous under the 

 twig-encircling egg masses of a moth, (possibly Malacosoma 

 disstria.} Entirely destitute of any secretionary covering; of 

 a light yellow color. 



Apterous female. Length (flattened on slide) .75 mm. Shape some- 

 what pyriform. Dorsum entirely destitute of pores, bearing a few 

 very minute spines, of which those on the head are borne upon slight 

 prominences. Derm minutely roughened in the cephalic region, else- 

 where quite smooth. Beak reaching somewhat beyond the posterior 

 legs, five-segmented. Antennae with the third segment somewhat 

 longer than the other two combined and rather prominently annulated ; 

 sensoria. if present at all. borne at the extreme tip of the third segment. 

 Abdominal spiracles apparently lacking. 



Type host and locality. From Oucrcns doncjlasii, on the 

 campus of Stanford University, California; Sept. 10. 1918. 

 Collected by the author. Holotype and paratvpes in the Stan- 

 ford collection. 



Notes. This probably belongs to the group of P. rilevi and 

 P. qucrceti, but the almost obsolete dorsal tubercles and the 

 absence of a conspicuous sensorium on the third antennal seg- 

 ment separate it at once. Attention should be called to the ap- 

 parent absence of abdominal spiracles. I find the same condi- 

 tion in specimens of what T take to be /'. rilcyi and in the 

 species later to be discussed in this paper as P. salicola. Tn P. 

 vastatrir the abdominal spiracles are certainly present. 



