Fifth Rep. U. S. Ent. Comm. 1890, p. 15.
Tr. Linn. Soc. xxi. 1852, p. 71.
Tr. ent. Soc. London, 1886, p. 162, and 1887, p. 303.
Ent. Month. Mag. xiii. 1877, p. 200.
A catalogue, with references, of the British Ichneumonidae was published by the Entomological Society of London in 1872. Since then many additional species have been detected and recorded, by Mr. Bridgman and others, in the Transactions of the same Society.