PTEROMALIDAE OF N.W. EUROPE 519 



31 (30) Head and thorax blue or greenish blue. Row of hairs on lower surface of 



costal cell only narrowly interrupted medially H. berylli (Walker) (p. 544) 



Head and thorax green or bronze-green. Row of hairs on lower surface of 



costal cell widely interrupted medially . . H. temporalis sp. n. (p. 547) 



32 (29) Head in dorsal view (Text-fig. 417) hardly twice as broad as long ; temples 



half or even slightly more than half as long as eyes, converging only slightly ; 

 frons projecting somewhat, the antennal toruli visible from above ; occiput 

 deeply excavated. Antennal scape reaching the vertex 



H. berylli (Walker) (p. 544) 

 Head in dorsal view at least twice as broad as long ; temples usually shorter 

 and converging more distinctly, if nearly half as long as the eyes then (Text- 

 fig. 418) frons not projecting medially, toruli not visible from above, occiput 

 less deeply excavated, scape not reaching the vertex. .... 33 



33 (32) Fore wing with speculum, on upper surface of wing, extending as a bare strip 



below the marginal vein and nearly or quite reaching the base of the stigmal 

 vein. Head and thorax usually bright green to blue, occasionally a more 

 bronzy green ........... 34 



- Fore wing with speculum, on upper surface of wing, extending below the mar- 



ginal vein to at most about half way along this vein, not reaching the stigmal 

 vein. Head and thorax most often bronze- or dark bluish green, only 

 occasionally a brighter green ........ 36 



34 (33) Fore wing with postmarginal vein very slightly longer than the marginal vein, 



the latter only 1 to 1-22 times as long as the stigmal vein. Small species, 

 1 -5 to 2 mm. Median area of propodeum nearly uniformly reticulate ; 

 costula absent or hardly indicated . . H. ? brachygaster sp. n. (p. 549) 



- Fore wing with postmarginal vein only as long as, or slightly shorter than, 



the marginal vein ; the latter 1-3 to 1-45 times as long as the stigmal vein. 

 Species sometimes larger. Propodeum with median area sometimes 

 unevenly sculptured ; costula sometimes distinct ..... 35 



35 (34) Smaller species, 1-7 to 2 mm. Antenna with first funicular segment not or 



hardly longer than the pedicellus, at most 1-3 times as long as broad ; 

 funicular segments, except the first and sometimes the second, quadrate. 

 Propodeum with costula absent or hardly traceable H. ? decipiens sp. n. (p. 548) 

 Larger species, 2-2 to 2-8 mm. Antenna with first funicular segment 1-2 to 

 1 -5 times as long as the pedicellus, 1 -4 to 1 -6 times as long as broad ; usually 

 at least some of the funicular segments in addition to the first and second 

 are slightly longer than broad. Propodeum with costula, except in very 

 small specimens, usually distinct . . H. albipennis (Walker) (p. 544) 



36 (33) Head in dorsal view (Text-fig. 415) with temples rounded and hence appearing 



to converge more strongly . . . . . . . . • 37 



- Head in dorsal view (Text-fig. 418) with temples less rounded and converging 



less strongly ........... 38 



37 (36) Small species, 1 -5 to 2 mm., with head and thorax bright green or blue-green ; 



antennal flagellum most often testaceous beneath. Median area of propo- 

 deum nearly uniformly reticulate ; costula absent or at most very vaguely 

 indicated ............ 34 



- Species usually more than 2 mm. in length ; if only 2 mm., then head and 



thorax dark blue-green or bronze-green, and flagellum brown to blackish. 

 Median area of propodeum irregularly sculptured, sometimes partly smooth 

 anteriorly ; costula nearly always indicated, sometimes strong . . 38 



38 (37) Antennal scape reaching the top of the median ocellus, or nearly to the vertex. 



Fore wing with postmarginal vein as long as, or slightly longer than, the 

 marginal vein. Head distinctly broader than the mesoscutum. Combined 



