PTEROMALIDAE OF N.W. EUROPE 729 



Isocyrtus (Trichomahts) subnudus Thomson. Syntypes on 11 pins. LECTO- 

 TYPE, a female labelled " Lhn " [Lindholmen] . 



Widely distributed in Europe ; ? U.S.A. The species reared in the Ohio area, 

 U.S.A., from Rhynchaenus pallicornis Say, and determined as Habrocytus orchestis 

 (Ratzeburg) (see Mundinger, 1951 : 30) might be the same as Trichomahts inscitus 

 but the specimens are not available for checking. 



Biology. Reared in England from Orchestes alni L. on Ulmus (B. S. Doubleday) 

 (material in Hope Dept., University Museum, Oxford) and from the same host by 

 Forster (see Delucchi & Graham, 1956 : 564) ; from O.fagi L. on Fagus in the canton 

 of Zurich 15-20. v. 1954 (Delucchi) (Delucchi and Graham, 1956 : 564) ; from 

 O.fagi L., 0. quercus L. and 0. testaceus Mull, in U.S.S.R. (Bukovskij) (Bukovskij, 

 1938 : 160, as Trichomahts diachymatis) ; also from 0. testaceus Mull, in Sweden 

 (Ruschka) (Ruschka, 1924 : 14). Imagines captured in the field June-Sept., 

 females also throughout the winter and in the spring. 



Trichomalus perfectus (Walker) 



(Text-fig. 590) 



Pteromahis perfectus Walker, 1835 : 488, $. 



Pteromalus decorus Walker, 1835 : 496, $. 



Pteromalus decisus Walker, 1836 : 185, $. 



? Pteromalus Hippo Walker, 1839 : 247, £. 



Pteromalus opulentus Forster, 1841 : 26, 9- 



Isocyrtus (Trichomalus) laevinucha Thomson, 1878 : 140, $ $. 



Trichomalus perfectus (Walker) Graham, 1956/; : 250. 



Trichomalus perfectus (Walker) ; Delucchi & Graham, 1956 : 550-551, 571-572, $. 



Trichomalus perfectus (Walker) ; Peck, 1963 : 669. 



Type material. For most of the above synonymy, and designation of lectotypes 

 for Pteromalus perfectus, P. decorus, and P. decisus, see Graham (1956b : 250). 



Pteromalus hippo Walker. One male, LECTOTYPE (possibly holotype), bearing 

 a Waterhouse label. 



Pteromalus opulentus Forster. One female, pinned to a block of pith, LECTO- 

 TYPE ; labelled " Collect. G. Mayr " and, in Forster's handwriting, " Pteromalus 

 opulentus nob. det. For. 18 ". 



Isocyrtus (Trichomalus) laevinucha Thomson. Syntypes, 9 specimens. LECTO- 

 TYPE, a female labelled " Scan ". 



Britain, Sweden, Germany, Holland, France, Switzerland, U.S.S.R.; 

 Canada. 



Biology. Reared from Ceuthorrhynchus assimilis Payk. in Holland, France and 

 Switzerland (Delucchi & Graham, 1956 : 572 ; Delucchi, in Secretariat, etc. 1961 : 

 215) ; also recorded as a parasite of Ceuthorrhynchus pleurostigma Marsh. (Secretariat, 

 etc., 1963 : 344, 355). Peck (1963 : 669) states that specimens from British 

 Columbia, " reared from Ceutorhynchus assimilis, agree with Delucchi & Graham's 

 description of T. perfectus. The other Pacific Coast records without much doubt 



