324 University of California Puhlications [Entomology 



cause a general smutting of the trees. Viviparous females occur 

 throughout the spring and summer. Sexual forms were taken 

 on October 10, 1914. 



Myzocallis coryli (Goetze). This very small pale yellow 

 species occurs in great numbers on the undersides of the leaves 

 of an introduced hazel or filbert. Corylus maxima Mill., growing 

 in the botanical gardens on the campus. The insects secrete 

 quantities of honey-dew and cause severe smutting of the foliage. 

 Collected in great numbers on June 28, 1916, when apparently 

 at its maximum development. 



Myzocallis pasaniae Davidson. A yellow species of median 

 size infesting the undersides of the leaves of the tanbark oak, 

 Pasania densiflora Oerst., growing on the Campus, June 27, 1916. 



Myzocallis quercus (Kalt). This small species varies in color 

 from pale yellow to light green and has four rather conspicuous 

 dark tubercles on the dorsal base of the abdomen. It generally 

 infests a number of deciduous oaks on the campus, including the 

 English oak, Quercus rohur Linn. Collected October 10, 1914, 

 and June 20, 1916. It was also taken on what appears to be the 

 same oak in Golden Gate Park, San Francisco, California, ]\Iay 

 25, 1916. The species was questioned for some years but was 

 recently verified for W. J\I. Davidson by P. van der Goot and 

 for the author by A. C. Baker. ( The recently published paper in 

 Tlie Entomological News, vol. 28, no. 2, Feb., 1917. pp. 62-63, 

 plate 7, by G. 0. Shinji, a student here, has added to the con- 

 fusion. He described two species, Myzocallis essigi and M. wood- 

 trorthi from M. quercus (Kalt.). M. essigi is the common forms of 

 M. quercus and M. wooehrorthi is the male of the same thing. All 

 of the specimens were taken from the tree from which my speci- 

 mens of M. quercus were taken. Had Shinji sulnnitted his paper 

 to some member of the entomological department as should have 

 been done such an error could have been avoided. ]\Ir. A. C. 

 Baker examined the type slides also and agrees with my deter- 

 minations. It might be stated here that there are a number of 

 different species on the type slides and it was necessary to have 

 Mr. Shinji designate the type descril)ed in each case. — INlarcli 1, 

 1917.) 



Myzocallis ubnifolii (Monell). A bright yellow species occur- 

 ring on the leaves of English elm, Ulmus campestris Smith, and 

 other elms at Berkeley, California, September 20, 1916, and at 

 Sacrantento, California, July, 1914. 



