GENERIC CLASSIFICATION OF APHIDIDAE. 29 
Genus MONELLIA Oestlund. 
Plate IV, M, N. 
1887. Monellia Oestlund, Gaol, and Nat. Hist. Survey Minn., Bui. no. 4, p. 41. 
The genus Monellia Oestlund was erected for caryellus Fitch and 
only one species was included in the genus at the time. Several other 
species, however, were made synonyms of caryellus which are quite 
different from that species and fall into other genera. 
Characters. — Cornicles present as mere rings; antennse slender, of six segments; sen- 
soria oval or subcircular; head broad for its length; prothorax prominently separated 
from the mesothorax. Fore wings with the media twice branched ; hind wings with 
both media and cubitus present. Wings often held flat upon the back, cauda knobbed, 
anal plate bilobed. Forms living solitary upon the leaves, sometimes having the 
power of leaping. Apterous forms rare. Sexes feeding; oviparous female laying 
several eggs. 
Type (monotypical), Aphis caryella Fitch. 
Genus MYZOCALLIS Pass. 
Plate IV, G, H. 
1860 
1860 
1894 
1894 
1913 
1915 
1917 
1917 
Myzocallis Passerini, Gli Afidi, p. 28. 
Pterocallis Passerini, Gli Afidi, p. 28. 
Subcallipterus Mordwilko, Varshava Univ. Izviestiia, v. 8, no. 58, p. 53. 
Tuberculatus Mordwilko, Varshava Univ. Izviestiia, v. 8, no. 58, p. 60. 
Callipterus Van der Goot, Tijd. voor Ent., v. 56, p. 116. 
Tuberculides Van der Goot, Beitrage zur Kennt. der Holl. Blattlause, p. 313. 
Acanthocallis Matsumura, Jour. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 368. 
Takecallis Matsumura, Jour. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 373. 
When Passerini erected the genus Myzocallis in 1860 he placed 
coryli Goetz as type. Later in the same work he erected his genus 
Pterocallis with alni Pass, as type. This species proves to he very 
similar indeed to coryli, so similar in most of the characters that the 
writer believes the genus Pterocallis to he a synonym of Myzocallis. 
The type of the genus, coryli Goetz, was also placed as the type of 
Callipterus by Van der Goot, in 1913, in spite of the fact that another 
type for that genus had been set in 1860. Callipterus Van der Goot 
(1913) is therefore a synonym of Myzocallis. The species alni Pass. 
is universally considered the same species as alni Fab., and this 
species was made the type of the genus Subcallipterus by Mordwilko 
in 1894. Subcallipterus Mordwilko, 1894, is therefore a synonym of 
Myzocallis for the same reason as is Pterocallis Pass., 1860. The 
species querceus Kalt. was made the type of the Tuberculatus by 
Mordwilko in 1894, but this species seems too closely related to coryli. 
Tuberculatus, therefore, becomes a synonym. The species quercus 
Kalt. was made the type of Tuberculoides by Van der Goot, 1915, 
and this is quite typically a Myzocallis. A number of genera have 
been erected by Matsumura which are so very little different from the 
type species that they are listed here as synonyms. This author 
follows the idea of proportions of the antennal segments as generic 
characters. 
