18 MISCELLANEOUS STUDIES 



are laid the author is unable to say. A curious fact is that thp 

 oviparous females are alate as well as apterous. The author has never 

 seen the alate forms, but Wilson (1908) describes them. 



3. Genus Drepanaphis Del Guercio 



Del Guercio, Eivista di patologia vegetable, vol. 4, pp. 49-53, 1909. Type 

 Siphonophora acerifolii Thomas. 



5. Drepanaphis acerifolii (Thomas) 



Figures 23, 37 



Thomas, Illinois Lab. Nat. Hist., Bull. 2, p. 4, 1878. Siphonophora (orig. 



desc. ) . 



Clarke, Can. Ent., vol. 35, p. 249, 1903. Drepanosiphum (list). 

 Sanborn, Kan. Univ. Sci., Bull. 3, p. 45, 1904. Drepanosiphum (desc. ala.). 

 Davidson, Jour. Econ. Ent., vol. 2, p. 303, 1909. Drepanosiphum (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 380, 1910. Macrosiphum (list). 

 Essig, Pom. Jour. Ent., vol. 4, p. 760, 1912 (list). 

 Essig, Mon. Bull., Cal. Comm. Hort., vol. 3, p. 85, 1914 (list). 

 Essig, Mon. Bull., Cal. Comm. Hort., vol. 3, p. 445, 1914 (list). 



Records. Acer sp. : Stanford University (Davidson); Sacramento (Essig); 

 Hanford, Fresno County (B. V. Sharp) ; A. macrophyllum, A. saccharinum, Berke- 

 ley, July to October, 1915; Riverside, October, 1916; A. dasycarpum, A. plat- 

 anoides, Berkeley, 1915 (Essig); Quercus sp. (live oak), Berkeley (Clarke) (f). 



This is as common a species on maple in the San Francisco Bay 

 region as the preceding one. It has also been taken in the Sacramento 

 and the San Joaquin valleys, and in southern California. It is a 

 species easily recognized by its dark markings and the dorsal tubercles 

 on the first and second abdominal segments. 



4. Genus Calaphis Walsh 



Figure 28 

 Walsh, Proc. Ent. Soc. Phila., vol. 1, p. 301, 1863. Type C. betulella n.sp. 



6. Calaphis betulaecolens (Fitch) 



Figures 27-38 



Fitch, Cat. Homop. N. Y., p. 66, 1851. Aphis (orig. desc.). 



Clarke, Can. Ent., vol. 35, p. 249, 1903. Callipterus (list). 



Davidson, Jour. Econ. Ent., vol. 2, p. 301, 1909. Callipterus (list). 



Davidson, Jour. Econ. Ent., vol. 3, p. 376, 1910. Callipterus (list). 



Essig, Pom. Jour. Ent., vol. 3, p. 556, 1911 (syn.). 



Davidson, Jour. Econ. Ent., vol. 5, p. 404, 1912 (desc. sexes). 



Essig, Pom. Jour. Ent., vol. 4, p. 760, 1912 (list). 



Essig, Mon. Bull., Cal. Comm. Hort., vol. 3, p. 445, 1914 (list). 



Baker, Proc. Ent. Soc., Washington, vol. 18, p. 186, 1916 (desc.). 



Records. Betula, sp., Alameda, Contra Costa, Santa Clara counties (Clarke, 

 Davidson, Essig, Morrison, and the author). 



