PTEROMALIDAE OF N.W. EUROPE 563 



sculptured. Metapleuron finely, mesepimeron more coarsely, reticulate ; mesepisternum, 

 apart from the smooth area below the base of the hind wing, rather finely reticulate. Meso- 

 sternal mesolcus subobsolete. Fore wing (Text-fig. 315) with upper surface of costal cell bare, 

 lower surface with a complete row of hairs and some additional hairs scattered over the distal 

 third ; basal cell bare, open below ; basal vein bare or with one to two isolated hairs ; speculum 

 open below, on upper surface of wing reaching only to the base of the marginal vein ; wing 

 beyond the speculum rather densely pilose ; marginal vein 1 -5 to 1 -6 times as long as the stigmal 

 vein ; postmarginal vein as long as, or slightly shorter than, the marginal ; stigmal vein 

 straight or very slightly curved, stigma moderate-sized and subcircular, with a very short uncus. 



Gaster lanceolate, 2-6 to 3-3 times as long as broad, acuminate, 12 to 1-3 times as long as 

 head plus thorax, slightly narrower than the thorax ; last tergite 1-5 to 2-2 times as long as its 

 basal breadth ; hypopygium extending from one third to two fifths along the gaster. 



cJ. Differs from the female as follows : 



Fore wing immaculate ; gaster not reddish-marked. Combined length of pedicellus and 

 flagellum 1 -i to 1-15 times the breadth of the head ; pedicellus 1 -6 to 1-7 times as long as broad, 

 distinctly shorter than the first funicular segment ; distal segments of funicle relatively longer, 

 even the sixth is usually a little longer than broad, sometimes quadrate ; . flagellum clothed with 

 hairs which stand out at an angle of 40 to 45°, the length of the hairs equal to about half the 

 breadth of the segments that bear them. Marginal vein 1-4 toi -6 times as long as the stigmal 

 vein ; stigma a little smaller than in the female ; basal vein with up to four hairs. Gaster sub- 

 linear, as long as but much narrower than the thorax, convex or hardly sunken dorsally, with a 

 strong plica ventrally. 



Material examined. England : Berkshire, Wytham, 1 $, 29. vi. 1958, swept on 

 calcareous grassland (Graham) ; Surrey, Oxshott, 1 $, 9.viii.i893 (A. J. Chitty). 



France (unlocalized) : several <$, $ in the collection of J. Giraud (Museum 

 Nationale d'Histoire Naturelle, Paris). 



Biology. Reared from Aulax glechomae (L.) (Hym., Cynipidae) (Giraud) ; see 

 Giraud & Laboulebene, 1877 : 429. 



TRICOLAS Boucek 



Tricolas Boucek, 1967 : 644. Type-species : T. xylocleptis Boucek, by monotypy and original 

 designation. 



This genus is very similar to Habrocytus, but the female differs from those of 

 Habrocytus in having 3 transverse anelli, whilst the male differs from those of 

 Habrocytus in having the first funicular segment shorter than the second. 



Tricolas xylocleptis Boucek 



Tricolas xylocleptis Boudek, 1967 : 644-646, <J $. 



Type material. Holotype $, Bohemia, Praha-Bubenec, 1959 (Z. Hostounsky), in 

 Narodni Museum, Prague ; paratypes in the same institution and in Zoologische 

 Staatssammlung, Munich. 



Germany, Czechoslovakia. 



Biology. Parasites of the bark-beetle Xylocleptes bispinus (Duft.) in Clematis 

 vitalba L. (Boucek, 1967). 



