132 MISCELLANEOUS STUDIES 



Joint 623 of the antenna distinctly shorter than 5, the fourth still shorter 

 and its spur nearly as long as joints 4, 5, and 6 combined, cornicles seldom much 

 exceeding one-half the third joint of the antenna in length, and a supra-caudal 

 tubercle or spine entirely absent pastinacae 



Aphis nymphaeae Linn, has usually been considered by American 

 aphidologists as a species of Rhopalosiphum, but the presence of lat- 

 eral body tubercles, the short, robust body, and the absence of antennal 

 tubercles place it in the Aphidini rather than the Macrosiphini. 

 Therefore, it must be considered as belonging to this genus. Baker 24 

 has recently recognized it as belonging here. 



KEY TO CALIFORNIAN SPECIES 



1. A small spine or tubercle present at the distal end of the body just above the 



cauda (figs. 255, 256) capreae (Fabr.) 



No supra-caudal tubercle or spine 2 



2. General color pale green. VI spur as long as IV, V and VI base combined. 



Cornicles at most but slightly more than one-half the length of III. 



pastinacae (Linn.) 



General color dark brown, wine, or black. VI spur not as long as IV, V and 



VI base combined, although longer than any two together. Cornicles and 

 III subequal nymphaeae (Linn.) 



155. Siphocoryne capreae Fabr. 



Fabricius, Ent. Syst., p. 211, 1794. Aphis (orig. desc.). 

 Clarke, Can. Ent., vol. 35, p. 252, 1903. S. foeniculi (Pass.) (list). 

 Davidson, Jour. Econ., vol. 2, p. 303, 1909. S. solids Monell (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 377, 1910. S. foeniculi (Pass.), (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 377, 1910. S. salicis Monell (list). 

 Essig, Pom. Jour. Ent., vol. 3, p. 534, 1911. Hyadaphis pastin-acae (Linn.) 

 (desc.). 



Becords. Foeniculum vulgare; Berkeley and Newcastle (Clarke), Stanford 

 University (Davidson): Carum spp. ; Cicuta virosa; Santa Paula, Berkeley 

 (Essig) : Salix laevigata; Santa Paula (Essig), Brea Canyon, Los Angeles County, 

 April, 1917; Riverside, May, 1917:- Salix nigra; Lakeside, San Diego County, 

 April, 1916: Salix sp., Stanford University (Davidson). 



This species is found more or less abundantly in the spring on the 

 tender shoots and leaves of willows, migrating in early . summer to 

 various species of Umbelliferae. It is more common than 8. pastinacae 

 (Linn.), which species is also found on Umbelliferae in the summer, 

 but which passes the fall, winter, and spring on honeysuckle. 



23 In all the author 's specimens, VI is shorter than V, which in turn is shorter 

 than IV, while VI spur is nearly as long as the three together. 



2* Baker, A. C. and Quaintanee, A. L. Aphids injurious to orchard fruits, 

 currant, gooseberry and grape, U. S. Dept. Agr., Farmers' Bulletin 804, p. 21, 

 1917. 



