PTEROMALIDAE OF N.W. EUROPE 721 



Trichomalus nanus (Walker) 



Pteromalns nanus Walker, 1836 : 472, $. 



? Pteromahis Cerpheres Walker, 1839 : 255, <J. 



Pteromalus lucidus Forster, 1841 : 18, $, syn. n. [nee Walker, 1835]. 



? Pteromalus Aglaus Walker, 1845 : 263, $. 



Pteromalus Dipoenos Walker, 1848 : 124, 180, $, syn. n. 



Pteromalus versutus Forster, 1861 : 36, $, syn. n. 



Isocyrtus (Trichomalus) frontalis Thomson, 1878 : 136, <J $. 



Pteromalus speciosus Dalla Torre, 1898 : 148, syn. n. [n. n. for P. lucidus Forster, nee Walker]. 



? Trichomalus cristatus (Forster) Meyer, 1923 : 113, 117. 



? Trichomalus cristatus (Forster) ; Nikol'skaya, 1937 : 12-13, [ex parte]. 



Trichomalus nanus (Walker) Graham, 19566 : 247. 



Trichomalus statutus (Forster) Delucchi & Graham, 1956 : 548, 552-554, $ ?, [ex parte]. 



Type material. Pteromalus nanus Walker. Lectotype female designated by 

 Graham (i 956ft : 247). 



Pteromalus cerpheres Walker. Syntypes, 3$ ; LECTOTYPE, the second specimen, 

 which I consider is probably a male of nanus, bearing a Waterhouse label. 



Pteromalus lucidus Forster. Syntypes, 3 $. LECTOTYPE labelled " Collect. 

 G. Mayr " ; " Pt. lucidus Forster Type " and (in Forster's handwriting) " lucidus 

 m ". 



Pteromalus aglaus Walker. One male, LECTOTYPE, bearing a Waterhouse label. 



Pteromalus dipoenos Walker. One female, accepted as TYPE, bearing a 

 Waterhouse label. It is aberrant in having the propodeal costula stronger than 

 usual. 



Pteromalus versutus Forster. Syntypes, a male and a female, pinned and staged 

 on a pith block. LECTOTYPE, the female, labelled " Roseggthal " (in Forster's 

 handwriting) ; " Collect. G. Mayr " ; " Pt. versutus Forster Type " ; " Pteromal. 

 versutus 111. N. 109. <J. $ ". 



Isocyrtus {Trichomalus) frontalis Thomson. Syntypes on 35 pins. LECTOTYPE, 

 a female labelled " Lpl " [Lapland], " frontalis Ths ", and (on a red label) " Type ". 



$ (redescription). Length 1-6-2 mm. Head and thorax varying in colour from a rather 

 bright green through bronze-green to coppery bronze ; legs with femora more or less infuscate, 

 often mainly so, tibiae often infuscate medially, sometimes mainly. Basal cell of fore wing 

 often with a few scattered hairs in its distal part. Gaster short-ovate, as long as or somewhat 

 longer than the thorax, 1-5-175 times as long as broad ; last tergite at least slightly shorter 

 than its basal breadth, sometimes hardly more than half as long as broad. Propodeum and 

 antennae as described in my key to species. 



The female differs from that of posticus (Walker) mainly in its rather smaller 

 size, somewhat shorter antennal flagellum, and rather more transverse median area 

 of the propodeum ; from that of (?) coryphe (Walker) in the same characters and in 

 its shorter antennal scape ; and from that of statutus (Forster) particularly in its 

 shorter gaster and antennal flagellum. 



Britain, Sweden, Germany, Austria, Switzerland, Czechoslovakia, 

 ? U.S.S.R. 

 Biology. Not definitely known, but possibly the species is parasitic on Chloropid 



