PTEROMALIDAE OF N.W. EUROPE 763 



usually paler. Wings subhyaline ; venation mainly testaceous, the parastigma and stigma 

 sometimes slightly darker. Length 2-3-3 mm. Head 1-2-1-3 times as broad as the meso- 

 scutum, in dorsal view (Text-fig. 624) 2-03-2-15 times as broad as long ; temples from one 

 quarter to nearly one third as long as the eyes, rather straight ; POL 1-2-1-45 OOL. Eyes 

 separated by 1-2-1-35 times their length. Malar space 0-4-0-45 the length of an eye. Left 

 mandible with 3 teeth, right mandible with 4. Antenna with lower edge of toruli distinctly 

 above level of ventral edge of eyes ; scape as in peregrinus sp. n., but sometimes reaching the 

 middle of the median ocellus ; combined length of pedicellus and fiagellum distinctly less than 

 breadth of head ; pedicellus about twice as long as broad, nearly or quite as long as anelli plus 

 first funicular segment ; fiagellum fairly stout, only slightly clavate ; funicle proximally slightly 

 stouter than the pedicellus ; proximal segments of funicle quadrate in small specimens, up to 

 1-3 times as long as broad in large ones, sixth, and occasionally fifth and fourth, segments very 

 slightly transverse ; the first segment as long as, or slightly longer than, the second. 



Thorax 1-6-1-65 times as long as broad. Pronotal collar weakly margined (the margin 

 irregular, at most sharp over the middle third) its surface reticulate with a narrow smooth strip 

 along the hind margin. Mesoscutum about twice as broad as long, finely reticulate, a little 

 more coarsely in the middle posteriorly. Scutellum nearly or just as long as the mesoscutum, 

 slightly broader than long, finely reticulate. Propodeum from two thirds to three quarters as 

 long as the scutellum ; median area i- 15-1-4 times as broad as long, rather finely reticulate, the 

 nucha rather more coarsely, occupying slightly less than half the total length ; plicae and median 

 carina sharp, the latter extending for a short distance on to the nucha ; callus moderately 

 thickly pilose, the hairs extending along the hind margin, above the supracoxal flange, as far 

 as the sides of the nucha. Fore wing rather narrow, about 25 times as long as broad ; basal 

 cell, basal vein, and proximal portion of cubital vein, bare ; marginal vein 1-5-1-75 times as 

 long as the stigmal vein ; postmarginal vein usually slightly shorter than, occasionally as long 

 as, the marginal. 



Gaster long-ovate, at least somewhat longer than the thorax and sometimes as long as head 

 plus thorax, slightly broader than the thorax, 1-75-2 times as long as broad, slightly acuminate 

 apically ; basal tergite occupying one third or (usually) rather more than one third of the total 

 length, smooth ; the three following tergites nearly always with at least some trace of alutaceous 

 sculpture at their bases ; last tergite as long as or slightly longer than its basal breadth ; tips 

 of ovipositor sheaths just visible in dorsal view. 



Of the species previously described, the female of acuminatus sp. n. comes near 

 to that of americanus Gahan, which differs as follows : both mandibles with 4 teeth ; 

 antennae inserted only very slightly above the ventral edge of the eyes ; scape nearly 

 as long as an eye, reaching the vertex ; funicle proximally not stouter than the 

 pedicellus ; median carina of propodeum less strong, sometimes very weak or 

 even absent, the nucha a little shorter. The characters by which it differs from 

 other species of the genus may be seen by reference to my key to females. 



o". Differs from the $ as follows : 



Length 17 mm. Head in dorsal view twice as broad as long. Eyes separated by 1-25-1-3 

 times their length. Genae more strongly buccate ; malar space half the length of an eye. 

 Antennae inserted higher, their toruli midway between the anterior margin of the clypeus and 

 the median ocellus ; scape nearly as long as an eye, reaching above the vertex ; combined 

 length of pedicellus and fiagellum about 1-25 times the breadth of the head ; pedicellus hardly 

 twice as long as broad, about as long as the first funicular segment ; fiagellum nearly filiform, 

 slightly stouter than the pedicellus ; all funicular segments about 1-5 times as long as broad ; 

 clava about 3-5 times as long as broad, somewhat longer than the two preceding funicular 

 segments together, pointed apically ; fiagellum clothed with hairs which stand out at an angle 



