PTEROMALIDAE OF N.W. EUROPE 273 



fig. 203) meeting the hind margin of the mesoscutum at approximately the 

 same point as the hind ends of the notauli . . . . . . 52 



(1) Mesepimeron not marked off from the mesepisternum (Text-fig. 205), or rarely 



weakly separated at its lower end ; hinder part of mesopleuron entirely or 

 almost entirely smooth and polished. Scutello-axillar sutures not strongly 

 convergent, so that the base of the scutellum (Text-figs. 253, 255) is more 

 than half the distance which separates the hind ends of the notauli . . 50 



Mesepimeron (Text-figs. 206, 207) marked off from the mesepisternum by a 

 distinct impressed line, or elongate fovea, and often more or less reticulate. 

 Scutello-axillar sutures often strongly convergent or even meeting anteriorly 

 (Text-figs. 202, 204) .......... 3 



(2) Upper (inner) tooth of mandible (Text-fig. 208) smaller than the others, 



which are large and acute. Anterior margin of clypeus angulate or with a 

 weak median tubercle, sometimes with a median and two submedian 

 tubercles (Text-fig. 208). Mesosternal mesolcus absent, or very fine and 

 superficial. Female gaster subcircular, shorter than the thorax ; petiole as 

 long as broad. Antennal scape in both sexes as long or practically as long 

 as an eye ............ 4 



Upper tooth of mandible (Text-figs. 235, 248) not obviously smaller than the 

 others, which are sometimes rather obtuse. Anterior margin of clypeus 

 without tubercles ; either curved, subtruncate, or emarginate medially. 

 Mesosternal mesolcus distinct, usually deeply impressed. Female gaster 

 rarely subcircular ; petiole nearly always transverse. Antennal scape 

 usually shorter than an eye, except in two species, which have the gaster in 

 the female lanceolate and acute ........ 7 



(3) Male flagellum (Text-fig. 209) with less outstanding hairs, with numerous 



sensilla, distinctly stouter than the pedicellus ; axillae with alutaceous 

 sculpture all over. Female axillae with alutaceous sculpture all over ; 

 all coxae entirely dark ; radial cell of fore wing pilose . dispar sp. n. (p. 289) 

 Male flagellum (Text-fig. 211) with hairs standing out at an angle of 45° to 

 50°, with sparse sensilla, sometimes relatively less stout ; axillae usually 

 having their inner angle more or less smooth, or with weaker sculpture than 

 elsewhere. Female axillae usually with their inner angle more or less 

 smooth, or with weaker sculpture than elsewhere, if not, then either the 

 coxae are mainly testaceous, or the radial cell of the fore wing is more or less 

 bare ............ 5 



(4) Male flagellum more slender, not or hardly stouter than the pedicellus ; first 



segment of funicle slightly to distinctly longer than the pedicellus, the fol- 

 lowing segments, except sometimes the sixth, at least slightly longer than 

 broad ; scape as long as an eye. Female pedicellus at least slightly shorter 

 than first segment of funicle ; funicular segments, except sometimes the 

 fifth, at least very slightly longer than broad ; clava about as long as two 

 and a half preceding funicular segments ; legs testaceous, with at most the 

 bases of the coxae infuscate .... alectus Walker (p. 287) 



Male flagellum (Text-fig. 211) rather stout, slightly stouter than the pedicellus ; 

 first funicular segment not or only slightly longer than the pedicellus, 

 segments two to six quadrate or hardly longer than broad ; scape slightly 

 shorter than an eye. Female pedicellus (Text-fig. 210) as long as, or usually 

 slightly longer than, first segment of funicle ; at most, funicular segments 

 one and two slightly elongate, the rest quadrate ; clava nearly or quite as 

 long as the three preceding funicular segments together ; coxae, and 

 femora mainly, black with a metallic tinge ; hind tibiae sometimes more or 

 less infuscate ........... 6 



