1913] 
Girault: Chalcidoid Family Trichogrammatidae 
163 
Genus IX. Centrobia Foerster, 1856, p. 87 and footnote and p. 89. 
Synonym: Trichogramma Westwood — Foerster, 1851, p. 26. No 
real synonym. 
1. walkeri Foerster, 1851, pp. 26-28 and footnote to p. 27, tab. 1, fig. 9, a. b. c. 
Trichogramma walkeri Foerster, ibid. 
Calleptiles walkeri Foerster, 1856, p. 89. 
Centrobia walkeri Foerster, ibid. 
Genus X. Asynacta Foerster, 1856, p. 87 and footnote and pp. 89-90. 
Nomen nudum. 
To this list may be added Encyrtus embryophagus Hartig, being probably 
a species of Trichogramma. 
Thus, by the year 1856 ten genera of the family had been recog- 
nized including exactly ten species all of which, however, were 
not equally divided between the genera, two of the latter having 
no species named in connection with them. In spite of the prog- 
ress in knowledge of the group, the synonomy had become some- 
what involved, as is readily seen by looking over the brief catalogue. 
We may now enter somewhat more conveniently into the history 
of the group from the time of Foerster to the end of the year 1912. 
During the same year that Arnold Foerster published his 
important, epochal contribution to our knowledge of this family, 
the first American reference to the group was made. Asa Fitch 
(1856) described two parasites of the larva of Hemerocampa 
leucostigma Smith and Abbot under the names “Trichogramma? 
Orgyiae” and “Trichogramma? fraterna,” both of which, it now 
seems certain, belong to some other group than ours. They 
have been referred to in part 1 of this paper. In 1857, Stollwerck 
added much to our knowledge of the economy of the group by giv- 
ing his observations on the habits and life-history of Poropoea 
stollwerckii Foerster; this paper was important as it added the first 
known of the habits of any species of the family showing that the 
Poropoea passed its entire cycle within the egg of an attelabid 
beetle, excepting when adult. These observations form some of 
the most important which have as yet been made concerning the 
biology of these minute insects. In 1858, H. Reinhard published 
some brief but important notes, entitled “Beitrage zur Geschichte 
und Synonymie derPteromalinen” (continued) in which he discusses 
Ophioneurus simplex Ratzeburg which at first he refers to Tricho- 
gramma Westwood; and 0. signatus Ratzeburg which he refers to 
