20 MISCELLANEOUS STUDIES 



8. Euceraphis gillettei Davidson 



Figure 39 



Clarke, Can. Ent., vol. 35, p. 248, 1903. Lachnus alnifoliae Fitch (list). 

 Davidson, Jour. Econ. Ent, vol. 2, p. 300, 1909. L. alnifoliae Fitch (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 375, 1910. L. alnifoliae Fitch (list). 

 Essig, Pom. Jour. Ent., vol. 4, p. 773, 1912. Lachnus alnifoliae Fitch 



(list). 



Essig, Pom. Jour. Ent., vol. 4, p. 773, 1912. Lahnus alnifoliae Fitch (note). 

 Davidson, Jour. Econ. Ent., vol. 8, p. 421, 1915 (orig. dese.). 



Records. Alnus rhombifolia; Berkeley (Clarke), Stanford University, San 

 Jose, Walnut Creek (Davidson), Stanford University, March, 1915. 



This species was reported from alder by Clarke and Davidson as 

 Lachnus alnifoliae Fitch. Essig, in his Host plant list of California 

 Aphididae, lists Callipterus alnifoliae (Fitch) on Alnus rhombifolia, 

 but later states that this citation should be Lachnus alnifoliae Fitch. 

 Therefore he referred to this new species of Davidson. The author 

 took both apterous and alate viviparous females of this species on 

 Alnus rhombifolia, along the banks of the San Francisquito Creek, 

 near Stanford University, on March 19, 1915. During the spring it 

 was quite common there. 



6. Genus Eucallipterus Schouteden 



Schouteden, Mem. Soc. Ent. Belg., vol. 12, 1906. Type Aphis tiliae Linn. 

 KEY TO CALIFORNIA SPECIES 



1. Wings hyaline; III pale except at the apex, with 5-7 sensoria on the basal 



one-fifth (fig. 41) flava (Dvdn.) 



2. Wings with veins clouded; III with apical one-fifth and basal one-half dusky, 



and with about 13-15 sensoria on the basal one-half (fig. 42). 



tiliae (Linn.) 



9. Eucallipterus flava (Davidson) 



Figure 41 



Davidson, Jour. Econ. Ent., vol. 5, p. 406, 1912. Euceraphis (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 8, p. 423, 1915 (desc. sexes). 



Records. Alnus rhombifolia; San Jose, Walnut Creek (Davidson), Stanford 

 University (Morrison). 



This is an uncommon species in the San Francisco Bay region on 

 Alnus rhombifoli-a, occurring on the under side of the leaves. The 

 author has never collected it, but has specimens from Davidson, taken 



