THE APHELININA OF NORTH AMERICA. 
By L. O. Howard. 
The miuute and structurally interesting species of the chalcidid sub- 
family Aphelinime have been studied by systematic workers since the 
founding of the type genus by Dalnuin in 1820. This author differen- 
tiated the species A. insidiator and A. abdominalis from the older genus 
Entedon, with which they had previously been associated. In 1833 
Westwood established the genera Coceophagus and Agonioneurus, Dal- 
man's Aphelinus having contained species of each. In 1831 Xees von 
Esenbeck established the genus Myina, which corresponded exactly 
with Agonioneurus. In 1839 Walker placed both Westwood's genera 
together under Aphelinus, but in 1810 separated Westwood's Coceopha- 
gus. Foerster, in his Ilymeuopterologische Studien, discarded Apheli- 
nus on account of its poor definition and Agonioneurus on account of 
its length, retaining Myina of Nees and establishing the family Myin- 
oidre, with the genera, Myina, Mesidia, and Coceophagus. In 1876 Thom- 
son revived Aphelinus and established the tribe Aphelinina. In 1878 
Foerster, in his Klein e Monographic parasitischer Hymenopteren, added 
the new genera Encarsia and Centrodora, and referred incidentally to 
the group as Coccophagoida\ In 1880 the writer, following Thomson 
in the revival of the original genus Aphelinus, established the higher 
group as the subfamily Aphelininae and described a number of species 
in the genera Aphelinus and Coceophagus. Since then he has described 
occasional species in these two genera and has erected three new genera, 
viz, Ablerus, Aspidiotiphagus, and Prospalta. In 1851 Ilaldeman erected 
the genus Eriophilus to contain a single species, E. mall, parasitic upon 
Schizoneura lanigera, but, as shown by the writer in 1880, this genus is 
but a synonym of Aphelinus. Haldeman made no effort to determine 
the affinities of his genus, beyond stating that it belonged to the family 
Chalcidida3. In the previous year, however, Ilaldeman erected another 
genus, Eretmocerus, to contain the single species E. corni, which he 
reared from A ley r odes found upon the leaves of dogwood. This genus, 
which Haldeman considered to be allied to Mymar, is, as I am able to 
show by the rearing of new species, a true aphelinine. In 1891 Ash- 
mead placed the genus Eunoius of Walker in the subfamily Aphelinina? 
(Proc. Entom. Soc. Wash., vol. n, p. 108). Foerster had previously 
noticed the resemblance of this insect in certain characters to this 
group, but had removed it to the Pteromalinse, evidently on account of 
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