so 
Psyche 
[April > 
Family Ichneumonidce 
Rhyssa canadensis Provancher. Three females, September 
27. As members of this genus are known to parasitize Xiphydria, 
these probably came from the abundant X. maculata. 
Arotes amoenus Cresson. Two females, July 13. Species of 
Arotes are parasites of cerambycid beetles. 
Lissonota insita Cresson. Nine specimens of both sexes, 
July 13 — August 22. 
Polysphinda texana Cresson. This is a widely distributed 
parasite of spiders that has been bred by Cushman from the 
common Steatoda borealis. 
Family Vanhorniidoe 
Vanhornia eucnemidarum Crawford. Thirteen females and 
seven males, July 13 — September 26, all but one taken during 
July. 
This most remarkable insect was made the type of a new 
family by Crawford in 1909 when he first described it. The types 
were bred by Van Horn from larval cells of an unidentified Mela- 
sid (Eucnemid) beetle and the species has since been recorded 
by Champlain (Psyche, vol. 29, p. 100, 1923) as a parasite of 
Isorhipis flavicornis. The present series are undoubtedly from 
the same host, which is abundantly represented in the collection 
at hand. 
Crawford makes no reference to the systematic relation- 
ships of Vanhornia except to note that the wing- venation re- 
sembles that of Helorus. On account of its exodont mandibles 
one would naturally compare it with the family Alysidae and the 
somewhat dubious insect, Lysiognatha, placed by Ashmead as an 
Alysiid. It is very evident, however, from the other characters 
that Vanhornia has no affinities with any Alysiid. The antennae 
are not multiarticulate and the wing is provided with a costal 
cell, both of which are fundamental differences. Also the struc- 
ture of the abdomen which is heavily chitinized below, and forms 
a carapace above is entirely dissimilar to that of any Alysiid 
although in one genus, Symphya of the latter family the tergites 
