August, '17] BAKER: EASTERN APHIDS, PART II 421 



A form occurs in a collection taken on oak at New Haven, Conn., 

 June 27, 1913, by H. L. Trowbridge, on oak, New Haven, Conn., July 

 25, 1912, by J. K. Lewis, and in a collection taken on oak at Vienna, 

 Va., August 23, 1912, by the writer. This form agrees with the 

 specimens mentioned previously in all details excepting the markings 

 of the wings. It is true that larger or smaller specimens show longer 

 or shorter antennse, but this might be expected. Among the specimens 

 in these collections great variation is met with in the markings of the 

 wings. In several specimens the markings have a tendency to be 

 arranged along the veins. From this fact and the very close measure- 

 ments and structural details the writer feels that the specimens may all 

 represent the same species. He is, therefore, calling them punctatellus. 

 Abundance of material may, however, prove two species present. 



Myzocallis alnifolioe Fitch. (1851, p. 67.) This species occurs 

 throughout the Eastern States on alder and is recorded in our literature 

 as alni Fab. The European insect seems to be different from our form 

 and this is shown particularly in the oviparous female. In specimens 

 of the oviparous female of alni determined by Schouteden the third 

 segment of the antennse is armed with prominent hairs. The other 

 segments sometimes also have them although no sensoria are met 

 with on the antennse. The hind tibiae are swollen and covered with 

 numerous sensoria as is usual with many of such forms. Alnifolioe 

 on the other hand has no such prominent hairs on the antennae of the 

 oviparous forms. The third segment, however, is armed with several 

 sensoria in all adult specimens examined by the writer. These two 

 differences would seem to indicate that the American form is distinct 

 from the European. 



The types of alnifolice have seemingly been lost. It is most prob- 

 able that they were destroyed during the years between Fitch's death 

 and the time his collection was brought to Washington. In looking 

 over the Fitch collection the writer found the positions in which the 

 specimens were pined, but the specimens have disappeared. It would 

 appear, therefore, that the determination can never be positively 

 proven. The description, however, fits the insect well. In his notes 

 Fitch first described the species as Aphis alnicolens, which name he 

 afterwards changed. In his collection there were no specimens bearing 

 this name. 



Myzocallis calif ornicus n. sp. Taken on Quercus lobata Nee, Walnut 

 Creek, Cal., April 6, 1916, by W. M. Davidson. Although not a 

 Eastern species the present form is here described in order that it may 

 be included in the key of American species of the genus. It seems 

 to be somewhat related to fumipenellus Fitch. 



