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. 44. 



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; antennae 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 Afldi, p. 28. 



Pterocallis Passerini, Gli Afldi, 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 be very 

 similar indeed to coryli, so similar in most of the characters that the 

 writer believes the genus Pterocallis to be 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. 



