BIOEHIZA TERMINALIS. 119 



Sexual Form. — Yellow to yellowish -red ; tlie apical half or so of the 

 antenna3 and the dorsum of abdomen more or less blackish; wings 

 hyaline, the nervures pale fuscous. Head aciculate, somewhat opaque, 

 the mesothorax more shining, slightly and very finely punctured, the 

 pleurae shining, impunctate; parapsidal furrows distinct ; scutellum 

 irregularly and finely rugosely punctured, and with two foveae at its 

 base. 



Length 3 mm. 



The £ is always winged, but the ? not infrequently 

 has the wings rudimentary or entirely obsolete, in 

 which case there is a slight change in the convexity of 

 the scutellum. 



Gall. — The well-known Oak or King Charles' apple, 

 and worn by country boys in England on the 29th May. 

 Found on the terminal buds, very rarely in the lateral. 

 In size very variable, the average having a diameter of 

 about 20 mm. ; soft, spongy, white with rosy cheeks 

 when young, older greyish or pale brownish-yellow. 

 In the interior are found a large number of larval 

 chambers of a yellowish-white colour; these cells 

 being united by a spongy substance, soft and solid 

 when young, becoming dry and friable when old. 

 They occur in May and June, the flies coming out at 

 the end of May or early in June. 



I have never had any Synergus other than facialis 

 from these galls, nor has any one else, so far as I am 

 aware, except Walker, who records 8. socialis as an 

 inquiline. Socialis is a synonym of melanopus. He 

 bred it in June of the same year, and also in March and 

 April of the following year. The latter observation is, 

 however, not consistent with what we know of the 

 history of S. facialis, which always appears in June to 

 July of the same year, so that it is quite possible that 

 Walker may have really bred melanojpus. On the 

 other hand it may be that facialis, sometimes like so 

 many of the true gall-makers, may take some months 

 longer than usual to reach maturity. 



Walker, it may be added, states that " a few speci- 

 mens of other species of Gynipites appeared in the 

 summer," but no further indication is given as to what 

 these were. 



