366 ENTOMOLOGICAL NEWS. [DeC.,'lS 



unable to find any authentic record as to the wing position in 

 this species. 9 



In Moncllia californicus Essig, the wings are not held hori- 

 zontal. The one other species in this genus, M. costalis (Fitch) 

 is unknown to the writer, and in Baker's 10 description no 

 statement is made concerning this point. 



Inasmuch as this character of wing position is variable in 

 the type species, it cannot be considered of importance in sepa- 

 rating genera. Furthermore it is the writer's opinion that a 

 character, such as this, which cannot be used in the determina- 

 tion of mounted specimens, should not be considered. A large 

 part of the systematist's study must necessarily be with museum 

 specimens, and such a character cannot be of any use then. 

 Therefore, the retaining of this genus does not seem justifiable. 



Practically all of the species considered by the earlier Amer- 

 ican aphidologists as belonging to Calliptcrns Koch have been 

 transferred to Myzocallis Passerini. In this latter genus are 

 those species with the antennae set on more or less distinct 

 antennal tubercles and with the cornicles, although small, dis- 

 tinct and almost as long' as, or longer than, wide. This leaves, 

 therefore, in Callipterus Koch only those species without anten- 

 nal tubercles and with pore-like cornicles. Here, then, belong 

 the four species of Monellia Oestlund. 



Baker 11 gives a key to these American species. All four 

 have as their hosts, species of either Carya or Juglans, or of 

 both. C. californicus (Essig) is known to occur only in Cali- 

 fornia, and C. costalis (Fitch) in New York and Connecticut. 

 The other two species, C. caryae Moncll and C. caryclla 

 (Fitch), are found throughout the north and middle Atlantic, 

 the middle western, and the Pacific Coast States. In the west 

 they are of rare occurrence, however. 



9 Essig (Pom. Jour. Ent., 4: 771. 1912) in comparing his species, 

 californicus, with Thomas's description of caryae Monell states that 

 in the latter the wings are held horizontal. Thomas's note is not 

 accessible to the writer, however. 



10 Baker, A. C. Eastern Aphids, new or little known. Part II. 

 Jour. Econ. Ent., 10:424. 1917. 



11 Raker, A. C. Op. cit. 



