A SYNOPSIS OF THE APHIDIDAE 15 



segment, two dorsal and two marginal. Antennae pale except VI, 

 apical two-thirds of V, and apical one-third of IV. Legs pale with 

 light brown spots at joints; tarsi black. Cauda small and conicle, 

 cornicles not evident. 



Measurements : Body length 2.9 to 3.0 mm., width 0.96 to 1.2 mm., 

 antennae total 1.26 mm., Ill 0.36 mm., IV 0.32 mm., V 0.204 mm., 

 VI 0.205 mm. 



3. Phyllaphis quercicola Baker 



Figures 14 to 20 



Clarke, Can. Ent., vol. 35, p. 248, 1903. Schizoneura querci (Fitch) (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 374, 1910. S. querci (Fitch) (list). 

 Davidson, Pom. Jour. Ent., vol. 3, p. 398, 1911. S. querci (Fitch) (list). 

 Davis, Ent. News, vol. 22, p. 241, 1911. Phyllaphis querci (Fitch) (biblig.) 

 Davidson, Jour. Econ. Ent., vol. 7, p. 127, 1914. P. querci (Fitch) (note). 

 Gillette, Ent. News, vol. 25, p. 274, 1914. Phyllaphis sp. (list). 

 Baker, Ent. News, vol. 27, p. 362, 1916. P. quercicola n.n. for P. querci 

 (Fitch) of Davis. 



Eecords. Quercus agrifolia; Placer, Contra Costa, Santa Clara counties 

 (Davidson, Clarke); Stanford University, April, 1915; Berkeley, September, 1915; 

 Wynola, San Diego County, June, 1916; Charter Oak, Los Angeles County, Novem- 

 ber, 1916. Quercus lobata, Stanford University (Davidson) ; Q. wislizenii, Placer 

 County (Davidson); Q. dumosa, San Diego, August, 1915; Quercus sp., Spreckels, 

 Monterey County, 1913 (Gillette). 



This is a very common species of woolly aphis on the oaks, par- 

 ticularly the live oak, through southern and central California. 

 According to Davidson (1914) the stem mothers occur in pseudogalls 

 on the edges of the leaves. The second generation lice, when mature, 

 leave these galls to live on the upper and lower surfaces of the leaves, 

 unprotected except for their -woolly covering. The sexes, apterous 

 oviparous females and alate males, occur late in the fall. The vivi- 

 parous generations are all apterous. The writer has observed the 

 stem mothers as late as August in San Diego County, while he has 

 found the viviparous females on the under side of the leaves as early 

 as mid-June in Berkeley. 



The identity of this species has never been definitely established. 

 It was thought to be the species described by Fitch (Kept. Ins. N. Y., 

 vol. 5, p. 804, 1859) as Eriosoma querci, but in 1916 Baker pointed 

 out the identity of Eriosama querci Fitch, proving it to be identical 

 with a species of Anoecia found on Cornus and formerly considered 

 to be A. corni Fab. Baker's decision is that the Quercus-Cornus 

 species of the eastern United States is Anoecia querci (Fitch) and 



