584 M. W. R. de V. GRAHAM 



Synedrus transiens (Walker) comb. n. 



(Text-figs. 431-435) 



Pteromalus transiens Walker, 1835a : 192, $. 

 Synedrus cavigena Graham, 1956 : 97, <J §, syn. n. 



Type material. Pteromalus transiens Walker. One female, LECTOTYPE 

 (probably holotype), bearing a Waterhouse label. 



Synedrus cavigena Graham. Holotype $, England, Berkshire, Wytham Wood, 

 25.ix.1g53, on Quercus {Graham), in Hope Department, University Museum, Oxford. 



Britain. 



Biology. Unknown ; the species appears to be associated with Quercus as I 

 have several times swept it from the foliage of oak-trees. Imagines June and 

 September. 



HOLCAEUS Thomson 



Etroxys Forster, 1856 : 66, 71 [nee Hetroxys Westwood, 1833]. 



Etroxys sgen. Etroxys Thomson, 1878 : 88, 100. 



Etroxys sgen. Holcaeus Thomson, 1878 : 88, 104. Type-species : H. dichrous Thomson, by 



designation of Ashmead, 1904 : 313. 

 Holcaeus Thomson ; Ashmead, 1904 : 313, 314. 



Etroxys Schmiedeknecht, 1909 : 309, 310, 311 [ex parte, nee Westwood]. 

 Holcaeus Thomson ; Schmiedeknecht, 1909 : 209, 310, 312 [ex parte]. 

 Etroxys Kurdjumov, 1913 : 8, 16 [nee Westwood]. 

 Holcaeus Thomson ; Kurdjumov, 1913 : 8, 17 [ex parte]. 

 Etroxys Nikol'skaya, 1952 : 230 [nee Westwood]. 

 Holcaeus Thomson ; Nikol'skaya, 1952 : 230. 

 Holcaeus Thomson ; Graham, 1956a : 79-80. 

 Holcaeus Thomson ; Peck et at., 1964 : 51, 55. 



The biology of this genus is unknown. The species occur most often in woods, 

 particularly in shady places. 



Key to European Species 



(Females) 



1 Clypeus finely reticulate. Antennae short, combined length of pedicellus and 



flagellum about equal to breadth of head ; funicle conspicuously stouter than 

 the pedicellus, all its segments transverse, the first clearly shorter than the 

 pedicellus ; scape, not counting the radicula, at least slightly longer than 

 the clava ; clava 2 to 2-25 times as long as broad. Gaster ovate, not 

 longer than the thorax, its last tergite shorter than its basal breadth ; 

 tip of hypopygium (valvula ventralis) situated at two thirds the length of 

 the gaster as measured from the base. Spur of mid tibia half as long as the 

 first tarsal segment. Small species, length i-8 to 2-1 mm. ; body mainly 

 dark bluish ; femora extensively darkened, tibiae sometimes more or less so ; 

 median carina of propodeum absent or weak and irregular 



calligetus (Walker) (p. 588) 





